Relevant bibliographies by topics / Numerical results and simulation for M

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Numerical results and simulation for M'

Author: Grafiati
Published: 4 June 2025
Last updated: 6 July 2025

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Journal articles on the topic "Numerical results and simulation for M"

1

Muhič, Simon, and Matej Štefanič. "NUMERICAL ANALYSIS OF AN AHMED BODY WITH DIFFERENT SOFTWARE PACKAGES." Journal of Energy Technology 10, no. 1 (2024): 11–21. https://doi.org/10.18690/jet.10.1.11-21.2017.

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In this article, the results of CFD simulations are compared using two different software packages for numerical fluid dynamics. The analysis is performed for an Ahmed body, for which the measurement results and a variety of numerical simulations are available in the literature. The results of the stationary CFD simulations with the RANS approach show a significant difference between the results obtained with the SolidWorks Flow Simulation 2014 software and ANSYS Fluent 16.2 software in the air flow analysis area from 10 m/s to 60 m/s. The difference in computational time is also apparent.
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Wang, Yang, Shufeng Yang, Feng Wang, and Jingshe Li. "Optimization on Reducing Slag Entrapment in 150 × 1270 mm Slab Continuous Casting Mold." Materials 12, no. 11 (2019): 1774. http://dx.doi.org/10.3390/ma12111774.

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To reduce slag entrapment in 150 × 1270 mm slab continuous casting molds at the Tang Steel Company, the effect of submerged entrance nozzle (SEN) depth and casting speed on the phenomenon was studied by computational fluid dynamics simulations. Then, the slag entrapment behavior in continuous casting molds, utilizing Large Eddy Simulation (LES) by coupling the volume of fluid (VOF) method, was also used. Finally, the effect of several common oils usually used to simulate slag in water modelling on slag entrapment was discussed and the water modelling results were used to validate the numerical simulation findings. The results showed that the optimum scheme is a submerged depth of SEN 90 mm and a casting speed of 1.6 m/min. Under optimal conditions, the maximum surface velocity is smallest (0.335 m/s) and the maximum slag entrapment ratio (0.44%) appears in the position of 0.1 m below the meniscus after 15 s. The water modelling results were in good agreement with the numerical simulation results.
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Luan, Yi Gang, Na Liu, Zheng Wei Ma, Zheng Heng Zhao, and Xiao Meng Pei. "Flow Field Research on an M-Beam Separator." Applied Mechanics and Materials 419 (October 2013): 165–70. http://dx.doi.org/10.4028/www.scientific.net/amm.419.165.

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The paper focuses on the resistance characteristic of a novel M-beam separator. Adopting the combination of experiment study and numerical simulation, we achieve that 2D simulation has the similar results as 3D in predicting resistance characteristic which provides the theoretical basis for next research. An M-beam separator model ten times larger than original one based on similitude principle was made for sake of flow field visualization research. The paper analyses flow field distribution of the amplifying M-beam separator by silk thread display technology and the experiment results are well consistent with 2D numerical simulation. The flow field distribution described here could serve as a reference for developing M-beam separator.
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Zhu, Chunyue, Yanbin Dou, Guohua Yu, et al. "Modeling the Impact of Wind Drag Coefficient on Wind-Driven Currents in Lake Taihu, China." Water 16, no. 20 (2024): 2985. http://dx.doi.org/10.3390/w16202985.

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The wind drag coefficient, Cd, has a great influence on the numerical results obtained from shallow lakes. To analyze the modeling impacts of Cd on wind-driven currents, a series of numerical simulations of Lake Taihu were conducted at three grid resolutions (800 m × 800 m, 400 m × 400 m, and 100 m × 100 m) using the empirical formulae of Flather (F76), Large and Pond (LP81), Large and Yeager (LY04), Andreas (A12), and Gao (G20). The G20 formula produced the optimum results of all the formulae for both the water level and velocity simulations; however, the grid resolution was found to have a significant influence on simulation in G20 cases. Thus, the G20 formula is only recommended when using a high-resolution grid to meet the accuracy requirements of analyzing wind-driven currents in the numerical modeling of Lake Taihu. A combination of the A12 formula and a coarse grid is preferred when taking computational efficiency into consideration.
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Giraud-Moreau, Laurence, Abel Cherouat, Jie Zhang, and Houman Borouchaki. "Comparison between an Advanced Numerical Simulation of Sheet Incremental Forming Using Adaptive Remeshing and Experimental Results." Key Engineering Materials 554-557 (June 2013): 1375–81. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1375.

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Recently, new sheet metal forming technique, incremental forming has been introduced. It is based on using a single spherical tool, which is moved along CNC controlled tool path. During the incremental forming process, the sheet blank is fixed in sheet holder. The tool follows a certain tool path and progressively deforms the sheet. Nowadays, numerical simulations of metal forming are widely used by industry to predict the geometry of the part, stresses and strain during the forming process. Because incremental forming is a dieless process, it is perfectly suited for prototyping and small volume production [1, 2]. On the other hand, this process is very slow and therefore it can only be used when a slow series production is required. As the sheet incremental forming process is an emerging process which has a high industrial interest, scientific efforts are required in order to optimize the process and to increase the knowledge of this process through experimental studies and the development of accurate simulation models. In this paper, a comparison between numerical simulation and experimental results is realized in order to assess the suitability of the numerical model. The experimental investigation is realized using a three-axis CNC milling machine. The forming tool consists in a cylindrical rotating punch with a hemispherical head. A subroutine has been developed to describe the tool path from CAM procedure. A numerical model has been developed to simulate the sheet incremental forming process. The finite element code Abaqus explicit has been used. The simulation of the incremental forming process stays a complex task and the computation time is often prohibitive for many reasons. During this simulation, the blank is deformed by a sequence of small increments that requires many numerical increments to be performed. Moreover, the size of the tool diameter is generally very small compared to the size of the metal sheet and thus the contact zone between the tool and the sheet is limited. As the tool deforms almost every part of the sheet, small elements are required everywhere in the sheet resulting in a very high computation time. In this paper, an adaptive remeshing method has been used to simulate the incremental forming process. This strategy, based on adaptive refinement and coarsening procedures avoids having an initially fine mesh, resulting in an enormous computing time. Experiments have been carried out using aluminum alloy sheets. The final geometrical shape and the thickness profile have been measured and compared with the numerical results. These measurements have allowed validating the proposed numerical model. References [1] M. Yamashita, M. Grotoh, S.-Y. Atsumi, Numerical simulation of incremental forming of sheet metal, J. Processing Technology, No. 199 (2008), p. 163 172. [2] C. Henrard, A.M. Hbraken, A. Szekeres, J.R. Duflou, S. He, P. Van Houtte, Comparison of FEM Simulations for the Incremental Forming Process, Advanced Materials Research, 6-8 (2005), p. 533-542.
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Saadi, Souad, and Abla Chaker. "A Numerical Simulation Approach for Sunspot Area Calculation." Engineering, Technology & Applied Science Research 8, no. 3 (2018): 3013–17. https://doi.org/10.5281/zenodo.1400594.

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The aim of this paper is the numerical simulation of the sunspot area (SSA) and its location on the walls and on the floor of a room with a single window facing south. The input parameters of the calculation code are the geometry of the cell located in the site of Ksar Challala (35.1 N, 2.19 E, 800 m) in Algeria for the 21st of March, June and December. The SSA is a function of the window&rsquo;s area, the date and time, the orientation of the room, the altitude and the azimuth of the sun. The obtained results show that the western wall is affected by the sun in the morning, the eastern wall in the afternoon, the floor and the north wall in the middle of the day. By increasing the window area from 1 m<sup>2 </sup>to 2 m<sup>2</sup> we found that the SSA increases considerably.
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Němeček, Jiří, and Jiří Němeček. "NUMERICAL SIMULATION OF SLUMP FLOW TEST OF CEMENT PASTE COMPOSITES." Acta Polytechnica CTU Proceedings 30 (April 22, 2021): 58–62. http://dx.doi.org/10.14311/app.2021.30.0058.

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This study presents a numerical simulation of the mini-slump flow test performed on the Haegerman table, according to EN 1015-3. The two-dimensional axisymmetrical Volume of fluid (VOF) model is used for the calculation. Various scenarios with the different model set up and boundary conditions were calculated to show how the results are affected. Simulations with different lifting velocities were carried out and compared to the case with instantaneous demolding, which is commonly used in numerical simulations. Also, the effect on results is shown between noslip and specific shear boundary conditions on the mold. The results of simulations indicate that mold lifting should be considered in numerical modeling even if calculation time is highly prolonged. Lifting velocities should not exceed the value of 0.2 m/s in order to maintain laminar flow and stablecalculation.
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Putrananda, Musdika Bagas Satria, Aldias Bahatmaka, Widya Aryadi, Berliana Ayarent Puteri, and Christian Imanuel Hutagalung. "Numerical Analysis of Six Degrees of Freedom Motion Response of Trimaran Semi-Submersible Ship." Mekanika: Majalah Ilmiah Mekanika 24, no. 1 (2025): 61. https://doi.org/10.20961/mekanika.v24i1.99057.

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This study examines the motion response characteristics of a trimaran semi-submersible vessel, with a focus on its performance in tourism applications where passenger comfort is a primary concern. Using ANSYS AQWA simulation software, this analysis integrates diffraction and radiation theory with potential flow theory to evaluate the six degrees of freedom (surge, sway, heave, roll, pitch, and yaw) under various wave conditions, including different frequencies and directions based on the Joint North Sea Wave Project (JONSWAP) spectrum. Simulations were performed on waves with heading angles ranging from 0° to 180°. The simulation results were validated based on previous studies both experimentally and numerically. The results show that the sway peaks at 8 m/m for heading angles of 90°, while the surge reaches a maximum of 8 m/m at 0° and 180°. The heave motion resonates between 2.2 rad/s with a peak amplitude of 3 m/m at 90°. Pitch motion at heading angles of 0° reaches 40 °/m at 3.5-4 rad/s. Roll motion remained within acceptable limits (9 °/m), and yaw peaked at 13 °/m at 45° and 135°. These findings suggest that, although the trimaran exhibits stable performance in most motion responses, design improvements are necessary to mitigate excessive pitch motion and enhance passenger comfort in tourism applications.
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Fan, Yu Guang, and Ting Wei. "Numerical Simulation of Flow Process of Ammonium Persulfate Crystallizer." Advanced Materials Research 997 (August 2014): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.997.396.

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The method of computational fluid dynamics (CFD) is used to three-dimensional numerical simulation for the fluid flow process of ammonium persulfate crystallizer. By using standard model, this paper respectively simulated the flow field within the crystallizer in the impeller installation height of 1.2 m while stirring speed is of 60 r/min, 100 r/min and 200 r/min; and simulated the impact of the flow field inside the crystallizer when the stirring speed of 100 r/min and impeller installation height respectively is of 0.7 m, 1.2 m and 1.7 m. That calculation results show that: the velocity gradient is mainly concentrated in the area of internal draft tube and paddle around. With the increase of impeller speed, the flow velocity of the fluid within the crystallizer corresponding increases; and the energy also gradually decreases from mixing impeller to the settlement zone with the loss of the installation height, and the kinetic energy in the bottom of the crystallizer is reduced. Considering the energy and crystallization effect, selection of mixing speed of 100 r/min or so and installation height of about 1.2 m is more appropriate.
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Yin, Chongzhi, Shin-ichiro Shima, Lulin Xue, and Chunsong Lu. "Simulation of marine stratocumulus using the super-droplet method: numerical convergence and comparison to a double-moment bulk scheme using SCALE-SDM 5.2.6-2.3.1." Geoscientific Model Development 17, no. 13 (2024): 5167–89. http://dx.doi.org/10.5194/gmd-17-5167-2024.

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Abstract. The super-droplet method (SDM) is a Lagrangian particle-based numerical scheme for cloud microphysics. In this work, a series of simulations based on the DYCOMS-II (RF02) setup with different horizontal and vertical resolutions are conducted to explore the grid convergence of the SDM simulations of marine stratocumulus. The results are compared with the double-moment bulk scheme (SN14) and model intercomparison project (MIP) results. In general, all SDM and SN14 variables show a good agreement with the MIP results and have similar grid size dependencies. The stratocumulus simulation is more sensitive to the vertical resolution than to the horizontal resolution. The vertical grid length DZ ≪ 2.5 m is necessary for both SDM and SN14. The horizontal grid length DX &lt; 12.5 m is necessary for the SDM simulations. DX ≤ 25 m is sufficient for SN14. We also assess the numerical convergence with respect to the super-droplet numbers. The simulations are well converged when the super-droplet number concentration (SDNC) is larger than 16 super-droplets per cell. Our results indicate that the super-droplet number per grid cell is more critical than that per unit volume at least for the stratocumulus case investigated here. Our comprehensive analysis not only offers guidance on numerical settings essential for accurate stratocumulus cloud simulation but also underscores significant differences in liquid water content and cloud macrostructure between SDM and SN14. These differences are attributed to the inherent modeling strategies of the two schemes. SDM's dynamic representation of aerosol size distribution through wet deposition markedly contrasts with SN14's static approach, influencing cloud structure and behavior over a 6 h simulation. Findings reveal sedimentation's crucial role in altering aerosol distributions near cloud tops, affecting the vertical profile of cloud fraction (CF). Additionally, the study briefly addresses numerical diffusion's potential effects, suggesting further investigation is needed. The results underscore the importance of accurate aerosol modeling and its interactions with cloud processes in marine stratocumulus simulations, pointing to future research directions for enhancing stratocumulus modeling accuracy and predictive capabilities.
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Dissertations / Theses on the topic "Numerical results and simulation for M"

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Boeck, Thomas. "Benard-Marangoni convection at low Prandtl numbers : results of direct numerical simulations /." Aachen : Shaker, 2000. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009061205&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Wegner, Katja. "Visualisation of biochemical pathways and their simulation results." Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2865577&prov=M&dok_var=1&dok_ext=htm.

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Olmo, Segovia Arantxa. "FEM simulation of a steel box culvert test : Comparisons of numerical results with field data." Thesis, KTH, Bro- och stålbyggnad, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36950.

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Fröhlich, Kristina, Christoph Jacobi, Martin Lange, and Alexander Pogoreltsev. "The quasi two-day wave: the results of numerical simulation with the COMMA - LIM Model." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 26 = Meteorologische Arbeiten aus Leipzig ; 7 (2002), S. 122-134, 2002. https://ul.qucosa.de/id/qucosa%3A15226.

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The quasi two-day wave (QTDW), a prominent feature of the mesosphere mainly around solstices, is simulated with the COMMA-LIM Model (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology). The calculations are made approximately one month after the summer solstice in the Northern Hemisphere when the QTDW reaches its maximum in the mesosphere and lower thermosphere. The results show that the QTDW produces a moderate westward forcing of the zonally averaged flow and a poleward driving of the residual mean meridional circulation.<br>Die Quasi Zwei-Tage Welle (QTDW), eine deutliche Erscheinung in der Mesosphäre kurz nach dem Sommer Solstitium, wird mit dem COMMA-LIM Modell (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology) simuliert. Die Zwei-Tage Welle wurde unter Juli-Bedingungen an der unteren Modellgrenze angeregt, zu der Zeit, zu der sie ihr Maximum in der Mesosphäre und unteren Thermosphäre erreicht. Die Ergebnisse zeigen eine sich westwärts ausbreitende Welle, die auf den Grundstrom eine moderate Beschleunigung nach Westen ausübt. Die residuelle mittlere Meridional Zirkulation erfährt dadurch eine zum Pol gerichtete Triebkraft.
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Ogasawara, Takeshi. "Turbulent relative dispersion : self-similar telegraph model and its comparison with results of direct numerical simulation." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136726.

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GORRINI, ANDREA. "Empirical studies and computational results of a proxemic - based model of pedestrian crowd dynamics." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50254.

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The thesis work is organized in two main parts. The first includes a review of the social science framework about crowd dynamics and proxemics, and the methodological approach. The second part consists of several empirical studies. A summary of the contents is provided as follows. Starting from the pioneering study of Gustave Le Bon (1897), the social science contributions about crowds are reviewed in Chapter 2 (Contagion-Transformation Theory, Elaborated Social Identity Model, Emergent Norm Theory, Affiliative Approach). Chapter 3 presents the proxemic theory, with reference to the notion of personal space and the group proxemic behavior in static and motion situations. Chapter 4 presents the methodological approach, as composed of: in vivo observation, in vitro experiments and in silico simulations. Chapter 5 proposed the results achieved by means of two observations performed at the Campus of the University of Milano-Bicocca (Italy) and the Vittorio Emanuele II gallery (Milan, Italy). Chapter 6 presents two experiments focused on the combined impact of turning path and grouping on pedestrian crowd dynamics and the size of pedestrian personal space. Chapter 7 presents a simulation campaign performed by using the platform MAKKSim. The results achieved have been compared with the collected empirical data for sake of model validation. The thesis ends with final remarks about the achieved results and future works towards the improvement of the computational model of MAKKSim.
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Mickovic, Ana [Verfasser], and M. [Akademischer Betreuer] Wouters. "Factors that determine costing system errors – a numerical simulation approach / Ana Mickovic ; Betreuer: M. Wouters." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1188321749/34.

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Sakaue, Takahito. "Nonlinear Alfvén Wave Model for Solar/Stellar Chromosphere, Corona and Wind from the Sun to M Dwarfs." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263472.

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Zhang, Jingwei. "Numerical Methods for the Chemical Master Equation." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/30018.

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The chemical master equation, formulated on the Markov assumption of underlying chemical kinetics, offers an accurate stochastic description of general chemical reaction systems on the mesoscopic scale. The chemical master equation is especially useful when formulating mathematical models of gene regulatory networks and protein-protein interaction networks, where the numbers of molecules of most species are around tens or hundreds. However, solving the master equation directly suffers from the so called "curse of dimensionality" issue. This thesis first tries to study the numerical properties of the master equation using existing numerical methods and parallel machines. Next, approximation algorithms, namely the adaptive aggregation method and the radial basis function collocation method, are proposed as new paths to resolve the "curse of dimensionality". Several numerical results are presented to illustrate the promises and potential problems of these new algorithms. Comparisons with other numerical methods like Monte Carlo methods are also included. Development and analysis of the linear Shepard algorithm and its variants, all of which could be used for high dimensional scattered data interpolation problems, are also included here, as a candidate to help solve the master equation by building surrogate models in high dimensions.<br>Ph. D.
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Voigtmann, Steffen. "General linear methods for integrated circuit design." Doctoral thesis, Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2850248&prov=M&dok_var=1&dok_ext=htm.

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Books on the topic "Numerical results and simulation for M"

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Li, Chunding. Rebalancing and the Chinese vat: Some numerical simulation results. National Bureau of Economic Research, 2011.

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Mazo, Aleksandr, and Konstantin Potashev. The superelements. Modeling of oil fields development. INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1043236.

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This monograph presents the basics of super-element modeling method of two-phase fluid flows occurring during the development of oil reservoir. The simulation is performed in two stages to reduce the spatial and temporal scales of the studied processes. In the first stage of modeling of development of oil deposits built long-term (for decades) the model of the global dynamics of the flooding on the super-element computational grid with a step equal to the average distance between wells (200-500 m). Local filtration flow, caused by the action of geological and technical methods of stimulation, are modeled in the second stage using a special mathematical models using computational grids with high resolution detail for the space of from 0.1 to 10 m and time — from 102 to 105 C.&#x0D; The results of application of the presented models to the solution of practical tasks of development of oil reservoir. Special attention is paid to the issue of value transfer in filtration-capacitive properties of the reservoir, with a detailed grid of the geological model on the larger grid reservoir models.&#x0D; Designed for professionals in the field of mathematical and numerical modeling of fluid flows occurring during the development of oil fields and using traditional commercial software packages, as well as developing their own software. May be of interest to undergraduate and graduate students studying in areas such as "Mechanics and mathematical modeling", "Applied mathematics", "Oil and gas".
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CNRS-DFG Workshop on Numerical Flow Simulation (6th 1997 Marseilles, France). Numerical flow simulation I: CNRS-DFG collaborative research programme, results, 1996-1998. Vieweg, 1998.

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Hirschel, Ernst Heinrich. Numerical Flow Simulation III: CNRS-DFG Collaborative Research Programme Results 2000-2002. Springer Berlin Heidelberg, 2003.

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Joint CNRS-DFG Workshop on Numerical Flow Simulation (9th 2002 Nice, France). Numerical flow simulation III: CNRS-DFG collaborative research programme, results 2000-2002. Edited by Hirschel Ernst-Heinrich. Springer, 2003.

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Hirschel, Ernst-Heinrich. Numerical flow simulation II: CNRS-DFG collaborative research programme results 1998-2000. Springer, 2001.

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Ernst-Heinrich, Hirschel, Deutsche Forschungsgemeinschaft, Centre national de la recherche scientifique (France), and CNRS-DFG Colloquium on Numerical Flow Simulation (8th : 1999 : Berlin, Germany), eds. Numerical flow simulation II: CNRS-DFG collaborative research programme, results 1998-2000. Springer, 2001.

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W, Ambrosini, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research., Autoridad Regulatoria Nuclear (Argentina), and Università di Pisa. Dipartimento di costruzioni meccaniche e nucleari., eds. Verification of RELAP5/MOD 3 with theoretical and numerical stability results on single-phase, natural circulation in a simple loop. Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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W, Ambrosini, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research, Autoridad Regulatoria Nuclear (Argentina), and Università di Pisa. Dipartimento di costruzioni meccaniche e nucleari, eds. Verification of RELAP5/MOD 3 with theoretical and numerical stability results on single-phase, natural circulation in a simple loop. Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Whalley, John. State-owned enterprise behaviour responses to trade reforms: Some analytics and numerical simulation results using Chinese data. National Bureau of Economic Research, 2006.

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Book chapters on the topic "Numerical results and simulation for M"

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Ueda, Kyohei, Yoshikazu Tanaka, Anurag Sahare, et al. "LEAP-ASIA-2019 Simulation Exercise: Comparison of the Type-B and Type-C Numerical Simulations with Centrifuge Test Results." In Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading II. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48821-4_3.

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AbstractThis chapter presents a summary of Type-B and Type-C numerical simulations submitted by nine numerical simulation teams that participated in the LEAP-ASIA-2019 prediction campaign, with the results of a selected set of centrifuge model tests on the seismic behavior of a uniform-density, 20-m-long, and 5-degree sandy slope. Time histories of response accelerations, excess pore water pressures, and lateral displacements at the ground surface are compared to the experimental results. A majority of Type-B and Type-C numerical simulations were capable of simulating well the experimental trends observed in the centrifuge tests; in particular, Type-C simulations were found to capture the measured responses more accurately by adjusting the model parameters. Although it is quite challenging to perfectly capture all measured responses (e.g., accelerations, pore pressures, and displacements), the simulation exercises demonstrate that the numerical simulations can be further improved by accumulating high-quality experimental results as a database.
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Xu, Tong, Wei Sun, Wenyu Tan, and Shuai Feng. "Numerical Simulation of Ultimate Bearing Capacity of Corroded Pipeline under Coupling Load." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_19.

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AbstractBased on the ductile damage theory of metal materials, this paper systematically studies the ultimate bearing capacity of corroded pipeline subjected to axial force, bending moment and pressure by using fluid cavity simulation technology. For pipelines with different corrosion characteristics, the interaction diagram of the bearing capacity of corroded pipeline is established by considering the coupling effect of medium properties, pressure, external axial force and bending moment. The numerical simulation results show that the depth of corrosion strongly affects the bearing capacity of corroded pipeline. With the increase of defect depth, the N-M ( axial force and bending moment ) interaction curve of corroded pipeline gradually flattened. And the results can truly reflect the damage phenomenon.
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Leng, Qing, Ming Zhang, Gensheng Zhao, Senhao Mao, and Ang Jiang. "Simulation and Hazard Map of Flooding Caused by the Break of a Concrete Gravitational Dam." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_109.

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AbstractThe simulation of Concrete Gravitational Dam burst floods is an important research content in the field of disaster prevention and mitigation in water conservancy projects. Due to the extreme rainfall, earthquake, structure failure and etc., the concrete gravitational dam usually breaks in a short time period. The dam break flood will give an extreme risk to the downstream communities. Taking the flood simulation of the Kaliwa Dam in the Philippines as an example, based on the downstream channel of the dam body and the measured terrain on both sides, a numerical simulation model of one-dimensional and two-dimensional coupled flood evolution is constructed, and the numerical simulation of the flood evolution process of the dam collapse is carried out, counts the inundation range, water depth, flow velocity, flood arrival time and other disaster causing factors in the downstream inundation area, and draws the flood hazard map of both banks downstream. The simulation results show that the KALIWA burst accident occurred, the total inundation area downstream is over 38 km2 in the downstream of the Kaliwa Dam. The dam break flood peak takes 1.5 h to reach the downstream estuary, which is the shortest time. The General Nakar City and Infanta City are inundated completely with the depth of 1.0 m to 2.0 m. The terrain near the upper reaches of the lower estuary is open and flat, the downstream area will be affected seriously by the flood. It is proposed to build a flood warning system to give the people downstream of Kaliwa Dam. The results of the research will provide a scientific basis for dam-break flood risk analysis, disaster assessment.
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Dong, Shangwei, Zhimin Tian, Ce Tian, and Jiuyi Li. "Research on the Conversion Relationship of Nuclear-TNT Blast Loading Based on a Protective Door Test Under TNT Blast Loading." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-6238-5_8.

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AbstractTo solve the technical problem of converting the nuclear blast loading to equivalent chemical blast loading, based on a certain protective door test under TNT blast loading, taking the same maximum dynamic response of the protective door as the equivalent principle, numerical simulation method, impulse equivalence method, and Duhamel integration method are carried out to obtain the peak overpressure of nuclear blast under different TNT blast, conversion function of nuclear-TNT blast loading is fitted as a consequence. The fitting results show that all three methods are reasonable and effective. In comparison, when the stand-off distance z is greater than or equal to 1.71 m/kg1/3, the Duhamel integration method is more suitable, while when z is less than 1.71 m/kg1/3, the impulse equivalence method is.
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Shu, Youming, Na Meng, and Shenghao Zhang. "Study on the Influence of Burner Size on the Maximum Temperature Rise of Smoke Flow Induced by Double Tunnel Fires." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2417-8_29.

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AbstractBased on FDS, numerical simulations were carried out to investigate the maximum temperature rise of smoke flow induced by double fires in a tunnel with natural ventilation. A full-scale model tunnel was established. The influence of 4 different sizes of double fire sources on the maximum temperature rise under the ceiling is studied when the distance between fire sources is 0 ~ 2 m. Results found that the maximum temperature rise decreases with the increase in burner separation distance and also decreases with the increasing burner size. Based on the model for the highest temperature for the ceiling-jet of one fire source, a new expression considering the burner size and the burner distance was put forward to predict the maximum temperature rise for double fire sources in tunnel fire, which can well correlate the numerical results.
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Narbayev, Bakdauren, and Yerlan Amanbek. "Finite Element Model for Wind Comfort Around a Tall Building: A Case Study of Tower of Qazaqstan." In Computational Science and Its Applications – ICCSA 2022 Workshops. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10542-5_37.

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AbstractPedestrian wind comfort plays an essential role in the urban environment. In our work, we consider a model obtained using Computational Fluid Dynamics (CFD) around a tall building. Our focus is the Tower of Qazaqstan or Abu Dhabi Plaza in Nur-Sultan city (Kazakhstan), which will be the tallest building in Central Asia with a height of 310.8 m. We investigated the effect of the wind velocity on pedestrians by solving the incompressible time-dependent Navier-Stokes equations in the deal.II library by the Finite Element Method (FEM) using the projection method. We present numerical simulation results for various scenarios. It has been found that the velocity profile can vary in the domain that creates different pedestrian comfort conditions including the exceeded category at places dedicated to pedestrian walking.
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Madabhushi, Gopal S. P., Stuart K. Haigh, Jad I. Boksmati, Samy Garcia-Torres, and Alessandro Fusco. "LEAP-ASIA-2019 Centrifuge Tests at University of Cambridge." In Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading II. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48821-4_5.

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AbstractTwo dynamic centrifuge tests were conducted on a 5° liquefiable slope with a slope depth of 4 m at the centre line, as part of LEAP-ASIA-2019 at the Schofield Centre, University of Cambridge. The main purpose of these tests was to investigate the suitability of the generalised scaling laws proposed by Iai et al. (Geotechnique, 55(5):355–362, 2005). The two tests were carried out at two drastically different g levels, CU Model B at 80 g and CU Model B1 at 1 g, with corresponding virtual scaling factors of 0.5 and 40, respectively. Following the principles of generalised scaling, results from both tests should be representative of the same slope profile with a slope depth of 4 m previously tested as part of LEAP-UCD-2017. CU Model B exhibited typical liquefaction behaviour with substantial reduction in acceleration transmission along the depth of the slope coupled with considerable excess pore pressure build-up during shaking. For a similar input motion, the slope in CU Model B1 at 1 g showed little deformations. Intensity of the input motion had to be increased by nearly twofolds to trigger slope movements that can be measured by PIV.
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Jæger, Karoline Horgmo, and Aslak Tveito. "Derivation of a Cell-Based Mathematical Model of Excitable Cells." In Modeling Excitable Tissue. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-61157-6_1.

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Abstract Excitable cells are of vital importance in biology, and mathematical models have contributed significantly to understand their basic mechanisms. However, classical models of excitable cells are based on severe assumptions that may limit the accuracy of the simulation results. Here, we derive a more detailed approach to modeling that has recently been applied to study the electrical properties of both neurons and cardiomyocytes. The model is derived from first principles and opens up possibilities for studying detailed properties of excitable cells.We refer to the model as the EMI model because both the extracellular space (E), the cell membrane (M) and the intracellular space (I) are explicitly represented in the model, in contrast to classical spatial models of excitable cells. Later chapters of the present text will focus on numerical methods and software for solving the model. Also, in the next chapter, the model will be extended to account for ionic concentrations in the intracellular and extracellular spaces.
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Gu, Yu, Xiangnan Gu, Yingbo Xu, and Fangwen Hong. "Numerical Simulation of Lock-In Phenomenon of Cylinder-Elastic Beam Model Based on CFD-FEM Fluid-Structure Interaction Method." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_69.

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Abstract In this work, taking the fixed structure of rigid cylinder and elastic beam as the research object, the lock-in phenomena in vortex induced vibration of an elastic beam induced has been simulated based on the separated two way fluid solid interaction analysis method. The CFD method is used to calculate the flow field, and the elastic beam displacement is solved by the finite element method. The coupling is realized by transferring fluid force and structural displacement at the interface of fluid–solid domain, and the deformation updating of the euler mesh of the flow field is realized based on the dynamic mesh technology. According to the calculation results, lock-in phenomena occurs in the flow velocity range of 0.5–0.55 m/s, and the vortex shedding frequency remains unchanged and close to the second natural frequency of the elastic beam. At the velocity range, the vibration response of the free end of the elastic beam decreases with the increase of the flow velocity, which is in line with the structural resonance characteristics in the lock-in phenomena.
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Gong, Zhiqun, Hongyu Guo, Helin Fu, Yibo Zhao, and Zetong Peng. "Study on Selection of Excavation Methods and Spacing Distance for Ultra-shallow-Buried and River-Crossing Tunnel with Small Clearance." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_25.

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AbstractFor the mined land section of the river-crossing tunnel with small clearance, the study should be carried out for excavation method and safe spacing before the tunnel construction, for engineering properties of surrounding rock is poor and the distance between two tunnel tubes is small. In this paper, in combination with the mined land section works of the river-crossing tunnel on Rongjiang Fourth Road, the finite difference numerical simulation software was adopted to calculate mechanical behaviors of three construction methods: three-bench method, CD method and CRD method under different excavation spacing (10 m, 20 m, 30 m and 40 m) on the basis of grouting and pre-reinforcement of surrounding rock in the early stage. The calculation results indicate that vault displacement and ground settlement can notmeet the specification requirements when the three-bench method is adopted for construction, even if the excavation spacing between the former and latter tunnels is 40m; When the CD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 40m; When the CRD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 30m; The control effect of initial support deformation and surrounding rock displacement is in the following sequence: CRD method &gt; CD method &gt; three-bench method. Considering various factors, it is found that the CD method is more reasonable and efficient. Therefore, the CD method is recommended for tunnel excavation and the tunnelling spacing should be controlled to 40m.
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Conference papers on the topic "Numerical results and simulation for M"

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Krikunova, A. I. "M-shaped flame dynamics: Numerical simulation results." In INTERNATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF COMBUSTION AND PROCESSES IN EXTREME ENVIRONMENTS (COMPHYSCHEM’20-21) and VI INTERNATIONAL SUMMER SCHOOL “MODERN QUANTUM CHEMISTRY METHODS IN APPLICATIONS”. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0033866.

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Soltani, M. R., M. Abedi, and R. Askari. "Numerical Simulation of Mixed Compression Intake Buzz." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71680.

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Numerical analysis has been conducted to simulate and capture Buzz phenomenon in a supersonic mixed compression air intake. Buzz is an unsteady self-sustained phenomenon occurred in supersonic intakes, especially when operating its subcritical condition, during which the system of compression and shock waves oscillate and move upstream and downstream along the intake. An axisymmetric and unsteady numerical simulation was used to solve Navier-Stokes equations in combination with URANS SST k-ω turbulence model The simulations were performed at M = 2.0 and at a specific subcritical point of the intake operation where buzz was detected experimentally. Results are compared with experimental pressure data. Buzz is captured numerically, and the results show that the buzz oscillation in this intake is periodic, during which the intake duct is loaded and unloaded. The results show that the large separation region on the compression ramp blocks the duct entry and causes the conical and lambda shocks located on the compression ramp to move upstream cause the self-sustained oscillation. The calculated buzz frequency is in agreement with the experimental one, and the difference is less than 0.2%. Further, the peak and trough of both total and static pressure fluctuations, and as a result, the amplitude of buzz are all accurately predicted.
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Reppas, N., C. Davie, B. Wetenhall, Y. L. Gui, and J. Ma. "Numerical Simulation of Triaxial Experimental Results on Sandstone Using Critical State Mechanics." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2184.

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ABSTRACT: In carbon capture and storage schemes, the carbon dioxide (CO2) can be injected at high pressures and low temperatures for permanent storage in deep reservoirs. In the North Sea, the storage sites will be predominantly sandstone. Triaxial tests on sandstone were conducted until failure using representative in-situ stresses to estimate the mechanical properties of the rock. A theoretical constitutive model, using Finite Element Modelling (FEM), describing the stress-strain behavior and damage evolution of rock during triaxial testing, is presented alongside the results of the tests. The model reproduced the experimental outcomes satisfactorily and was used to estimate the critical state mechanic parameters. Lower temperature indicated higher strength on sandstone, a decrease in the Poisson’s ratio and, consequently, damage increase. 1. INTRODUCTION Potential Carbon Capture and Storage (CCS) schemes include injecting liquid carbon dioxide (CO2) from ships into subsea formations for permanent storage. CO2 on a ship is stored at a temperature close to the triple point of CO2 at around -50°C~-57°C and exposed to almost 0.6~0.7 MPa pressure in order to keep the containment of the CO2 mixture in liquid form (Reppas et al., 2021, Wetenhall et al., 2014). The difference between the injected CO2 from a ship and the temperature of the wellbore wall, which is increasing by 30°C/km, is causing temperature fluctuations and external stresses. These loadings and their mechanical effects on the wellbore wall can be described by triaxial tests. Laboratory tests were undertaken to determine how the mechanical properties of sandstone elastic modulus E, Poisson’s ratio n, the shear modulus G and bulk modulus K of rock— are influenced by the different confining pressures and temperatures. As sandstone is found in the sub-sea basins, it has high porosity and can be a likely storage medium for CCS, it was selected as the type of rock for the triaxial testing. Three different temperatures 15°C, -5°C and -10°C were experimentally examined. The three temperatures represent a different injection scenario of CO2. Confining pressures of 12.5 MPa and 24 MPa were used to represent rock conditions at 500m depth and 1000 m depth under the North Sea, respectively.
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Matsuura, Kazuo, and Masami Nakano. "Direct Numerical Simulation of Global Instability in a Hole-Tone Feedback System." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-08034.

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Direct computations and experiments of a hole-tone feedback system are conducted. The mean velocities of an air-jet are 8 and 10 m/s in the computations, 6–13 m/s in the experiments. The diameters of a nozzle and an end plate hole are both 50 mm, and an impingement length between the nozzle and the end plate is 50 mm. The computational results agree well with the experimental data in terms of qualitative vortical structures and a relationship between the most dominant hole-tone frequency and a jet speed. Based on the computational results of the air-jet speed of 8 m/s, a Proper Orthogonal Decomposition (POD) analysis of the whole pressure fluctuation field is conducted. The 1st and 2nd POD modes are nearly in anti-phase, and alternatively appearing helical structures are observed upstream of the end plate hole in an isosurface plot of the eigenfunctions of the modes. Dominant behaviors of vortex shedding from the end plate hole are represented by the 3rd and 4th modes. As the result, dominant variation of the pressure fluctuation field is successfully extracted by the present POD analysis.
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Devaud, Cecile B., and Elizabeth J. Weckman. "Numerical Simulation of a Pool Fire and Large Object in a Cross-Wind." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56892.

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The present investigation is focused on assessing the capabilities of Large Eddy Simulations (LES) using simplified sub-models for combustion and soot in a specific fire scenario. Fire development resulting from an aviation fuel spill close to a plane fuselage is considered. The computational domain and boundary conditions are defined according to the experimental configuration used in tests run by the Fire Research Group at the University of Waterloo. The present setup consists of a 2-m-diameter pool fueled with kerosene and located 1-m-upstream of a 2.7-m-diameter culvert in a large enclosure. A cross-wind with a velocity of 13 m/s is imposed on the fire and culvert. The calculations are time-dependent and three-dimensional. Sensitivity to the grid refinement, size of the enclosure and wind profiles is first investigated. Comparison between measured temperatures and numerical results across the computational domain is made. Velocity profiles are also examined. Reasonable agreement with the experiments is found. In the light of the present results, directions for future work are also discussed.
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Garman, Mohamed, and Robert Visintainer. "Numerical Simulation of Clay Slurries With High Yield Stresses in Centrifugal Pumps." In ASME 2024 Fluids Engineering Division Summer Meeting collocated with the ASME 2024 Heat Transfer Summer Conference and the ASME 2024 18th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/fedsm2024-131324.

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Abstract Centrifugal slurry pumps are widely used for hydraulic transportation of solids in the mining and dredging industries. The performance of these pumps degrades when handling a slurry flow. The level of complexity increases for a pump handling non-Newtonian (non-settling) slurries, especially when these slurries exhibit a high yield stress. The viscous effect is the primary source of performance loss in non-Newtonian slurries, and this loss is more pronounced in efficiency than in head. In sets of experiments conducted at GIW Industries, Inc. [1], the measured pump performance and pipeline friction loss were captured while testing a phosphate clay slurry at different solids concentrations. This slurry was tested at a range of yield stresses from 100–600 Pa, established by varying the solids concentration. The tested pump was a GIW-LCC-M 80-300 type, featuring a three-vane, closed-shroud impeller with a 0.3-m diameter. A high-fidelity CFD simulation was developed and simulated, with the measured rheology used as an input to the CFD simulations. The simulation results showed a good agreement with the tested performance. The outcome of these simulations could be used as a resource for predicting the pump derate within the testing range, as the results could help in selecting the pump size and determining the power requirement.
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Buonomo, Bernardo, Oronzio Manca, Sergio Nardini, and Gianluca Tartaglione. "Numerical Simulation of Convective-Radiative Heat Transfer in a Solar Chimney." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20390.

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Solar chimney is a new method to produce electrical power. It employs solar radiation to raise the temperature of the air and the buoyancy of warm air to accelerate the air stream flowing through the system. By converting thermal energy into the kinetic energy of air movement, solar chimneys have a number of different applications such as ventilation, passive solar heating and cooling of buildings, solar-energy drying, and power generation. Moreover, it can be employed as an energy conversion system from solar to mechanical. A component, such as a turbine or piezoelectric component, set in the path of the air current, converts the kinetic energy of the flowing air into electricity. In this paper, a numerical investigation on a prototypal solar chimney system integrated in a south facade of a building is presented. The chimney is 4.0 m high, 1.5 m wide whereas the thickness is 0.20 m for the vertical parallel walls configuration and at the inlet 0.34 m and at the outlet 0.20 m for convergent configuration. The chimney consists of a converging channel with one vertical wall and one inclined of 2°. The analysis is carried out on a three-dimensional model in airflow and the governing equations are given in terms of k-ε turbulence model. The problem is solved by means of the commercial code Ansys-Fluent. The numerical analysis was intended to examine the effect of the solar chimney’s height and spacing. Further, comparison between radiative and non-radiative model is examined and discussed. Results are given in terms of wall temperature distributions, air velocity and temperature fields and transversal profiles for a uniform wall heat flux on the vertical wall equal to 300 W/m2. Thermal and fluid dynamics behaviors are evaluated in order to have some indications to improve the energy efficiency of the system.
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Parizi, H. B., L. Rosenzweig, J. Mostaghimi, et al. "Numerical Simulation of Droplet Impact on Patterned Surfaces." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0213.

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Abstract In this work we present the numerical simulation results for the molten nickel and zirconia (YZS) droplets impact on different micro-scale patterned surfaces of silicon. The numerical simulation clearly showed the effect of surface roughness and the solidification on the shape of the final splat, as well as the pore creation beneath the material. The simulations were performed using a computational fluid dynamic software, Simulent Drop, The code uses a three-dimensional finite difference algorithm solving full Navier Stokes Equation with heat transfer and phase change. Volume of fluid (VOF) tracking algorithm is used to track the droplet free surface. Thermal contact resistance at the droplet– substrate interface is also included in the model. Specific attention is paid to the simulation of droplet impact under plasma spraying conditions. The droplet sizes ranged from 15 to 60 microns with the initial velocities of 70-250 m/s. The substrate surface was patterned by a regular array of cubes spaced at 1 µm and 5 µm from each other. The peak to valley height of each cube was between 1 to 3 µm. Different splat morphologies will be compared with those obtained from the experimental results under the same impact and surface conditions.
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Xu, Youyou, Min Li, Xiaojian Wen, and Songlin Liu. "Numerical Simulation of Premixed Hydrogen-Air Combustion Behavior in a Closed Vessel." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66547.

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A closed vessel of 1.9 m length and 0.9 m in internal diameter is being designed and will be constructed to experimentally investigate combustion and propagation behavior of the hydrogen-air mixture. Before the experiment is performed, the benchmark and pre-analyses on the hydrogen combustion and propagation behavior in this vessel are carried out by using FLUENT CFD code. The benchmark results indicated that the peak overpressure verse time agrees well with the experimental results of published data. Furthermore, the effect factors such as the hydrogen concentrations, the ignition position, the initial temperature and the pressure were simulated. The results show that the ignition position, initial temperature and pressure have significantly influence on hydrogen behavior. In addition, the overpressure increases with the equivalent ratio and reaches the peak in the vicinity of stoichiometric ratio. However, the overpressure peak is considerably lower than the design pressure of the vessel.
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Masanobu, Sotaro, Satoru Takano, and Marcio Yamamoto. "Numerical Simulation of Pulsating Slurry Flow in a Jumper for Subsea Mining." In ASME 2024 43rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/omae2024-124676.

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Abstract For the design and operation of a subsea mining system, it is important to predict pressure loss due to the hydraulic transport of solid particles in the lifting system. The lifting system has a short flexible jumper to connect the seafloor mining tool to the lifting pump and a vertical riser pipe connecting this pump to the production support vessel. The configuration of the flexible jumper shall have an inclined part so that the mining tool can move freely on the seafloor. In the actual mining system, the slurry flow in the pipe system is expected to be unsteady. Then, the time-domain simulation is required for safe and reliable ore lifting. In the present paper, we develop the numerical model for the time-domain simulation for pulsating slurry flow in a jumper. The model is validated by comparison with the experimental results we carried out in the previous work using alumina beads, of which densities are almost the same as those of seafloor polymetallic sulphides ore, as solid particles. Next, we investigate the slurry flow in a jumper with steep wave configuration using the model developed. We assume the 100 m long flexible jumper of which outer and inner diameters are 0.254 m and 0.200 m, respectively. Seafloor polymetallic sulphides ore, whose density and diameter are 3,440 kg/m3 and 0.03 m respectively, are assumed as the solid particles. We vary the pulsating conditions of slurry flow and jumper configuration, and discuss the effects of slurry parameters, such as slurry flow pulsation on water velocity, solid velocity, solid concentration and pressure loss in the jumper system. As a result, the total time-averaged pressure loss increases as the top end of jumper is away from the neutral position. The amplitude of pressure loss pulsation is almost uniformly distributed along the jumper although the amplitude of solid concentration pulsation is ununiformly distributed. The slurry parameters should not be estimated using straight pipe simulation results for the neutral or near position of the jumper system.
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Reports on the topic "Numerical results and simulation for M"

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Johnson, Cody, Brian McFall, Douglas Krafft, and Mitchell Brown. Sediment transport and morphological response to nearshore nourishment projects on wave-dominated coasts. Engineer Research and Development Center (U.S.), 2025. https://doi.org/10.21079/11681/49721.

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Nearshore nourishments are constructed for shoreline protection from waves, to provide sediment nourishment to the beach profile, and to beneficially use dredged sediment from navigation channel maintenance. However, it is poorly understood how placement morphology and depth influence nearshore processes operated on wave-dominated coasts. This study investigates the wave fields, sediment transport, and morphological response to three common nearshore nourishment shapes, nearshore berm (elongated bar), undulated nearshore berm, and small discrete mounds, with numerical experiments utilizing the Coastal Modeling System. The nourishments are placed in depths between 3 m and 7 m with a volume of approximately 100,000 m³ and between 400 m and 1000 m in alongshore length. Numerical experiments are carried out in three distinct coastal settings with representative wave climates and geomorphology. Simulation results indicate that shallower, more continuous berms attenuate the most wave energy, while deeper, more diffuse placements retain more sediment. Results from this study improve the understanding of nearshore nourishment shapes and can support decision makers identifying the most appropriate construction technique for future nearshore nourishment projects.
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Rahai, Hamid, Assma Begum, Jeremy Bonifacio, and Ryan Moffit. Experimental Investigations of Wind Shear from Passing a Vehicle. Mineta Transportation Institute, 2024. https://doi.org/10.31979/mti.2024.2334.

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Wind energy can be harnessed for various commercial and transportation-related applications. This study assessed experimentally the potential of capturing wind energy from the passage of vehicles for electric power generation. Both wind tunnel experiments and field tests were performed. The wind tunnel experiments were performed in an open-circuit low-speed wind tunnel at a free-stream mean velocity of 23 m/s. Five PVC pipes placed adjacent to the wind-blowing domain were used to simulate the columns under a freeway overpass. A scaled Ahmad body (simplified car body model) was used as the vehicle. The spanwise distance between the Ahmad body and the tubes was 0.75 W where W is the width of the vehicle. The middle tube was used as a reference tube for circumferential and vertical pressure measurements. The streamwise locations of the vehicle were according to our previous transient numerical simulations as the vehicle approached and passed the columns at 0.1–0.5 sec. Results showed a significant potential of the transient wind generated from passing vehicles and identified optimized locations for harnessing this wind for electric power generation. Field tests were performed using a moving scaled Ahmad body. The vehicle speed was approximately 22 miles/hr (10 m/s.). Wind measurements were made up to 0.75 W adjacent to a vertical wall with static and total pressure taps. Results verified the corresponding wind tunnel results and showed a maximum transient wind of 10 m/s from the passing of the vehicle. These results were in agreement with our previous simulation results. The experiment results suggest great potential for harnessing the wind from vehicles to generate electric power, benefiting California's renewable energy goals.
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Rahai, Hamid, and Assma Begum. Numerical Investigations of Transient Wind Shear from Passing Vehicles Near a Road Structure (Part I: Unsteady Reynolds-Averaged Navier-Stokes Simulations). Mineta Transportation Institute, 2021. http://dx.doi.org/10.31979/mti.2020.1933.

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In this research, the authors performed unsteady numerical simulations of a moving Ahmed body under a freeway overpass at different distances from the bridge columns in order to evaluate transient wind shear and the wind load on these columns. Results have shown that when the vehicle is at 0.75W distance from the bridge columns, an unsteady wind speed of up to 24 m/s is observed at the columns with a pressure coefficient difference of 0.9. Here W is the width of the vehicle. These results indicate with an appropriate system for harnessing these wind energy potentials, significant renewable electric power could be generated with zero carbon footprint.
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Kaewplung, Pasu. Performance improvement of fiber-optic transmission system by replacing electronic repeaters with optical amplifiers. Chulalongkorn University, 2004. https://doi.org/10.58837/chula.res.2004.70.

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We study four methods: the zero-dispersion wavelength (ZDWL) transmission, the dispersion management, the optical soliton transmission, and the midway optical phase conjugation (OPC), for upgrading installed electronic repeater-based optical fiber transmission system to optically amplified system. We derive the optimum design rules for each scheme to achieve the maximum transmission data rate. The 1,318-km-long Thailand-Malaysia (T-M) submarine fiber-optic transmission system is used as the system model. Firstly, we give the basic knowledge about fiber characteristics and their effects to signal propagation, and review the concepts of four upgrading schemes. Then, the numerical simulation is used for studying the signal distortion induced from the third-order dispersion and the Kerr effect in ZDWL transmission system. When the ZDWL transmission is employed to upgrade the T-M system with our optimum design guidelines, the possibility of increasing data rate from 560 Mbit/s to 80 Gbit/s is shown. For the dispersion management, the transmission data rate can be extended to 100 Gbit/s for single channel, and to 6 x 10 Gbit/s for multi-channel wavelength division multiplexing. However, when the soliton scheme is employed to improve the system performance, the numerical result shows the possibility of increasing data rate only to 20 Gbit/s because of nonlinear signal distortions. The highest data rate in this study is obtained from the system upgrading using the midway OPC. By following our design strategies, the possibility of increasing to 200 Gbit/s is numerically shown.
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Rahai, Hamid, and Jeremy Bonifacio. Virus Control Aboard a Commuter Bus. Mineta Transporation Institute, 2023. http://dx.doi.org/10.31979/mti.2023.2248.

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A major health concern for public transit users is exposure to viruses from other passengers. This numerical study examines virus containment aboard a public bus with changes to the bus ventilation system. The virus was modeled as a 2.5 µm round solid particle released from the mouth of the infectious passenger at a rate of 21 particles per second at a mouth velocity of 0.278 m/sec. The air delivery to the cabin was two linear ceiling slots spanning the length of the bus delivering 59.38 m3/min (2,097 CFM) of air at a mean velocity of 1 m/sec. Two different axial and vertical linear exhaust slots placed on the side walls were investigated to examine how they affected virus containment and spread to the other parts of the cabin. Simulations were performed for both cases of the bus in transit and at the bus stop when the drop-off door was opened. Results indicate during transit that virus spread was contained to passengers sitting immediately in front of and behind the infectious passenger and the level of virus concentration could merit an increased risk of infection with increased virus residence time. However, augmented air mixing was observed between inside and outside air during the passenger drop-off with viruses spread to the front and back of the bus with reduced concentration and risk of infection. Analytical analyses of the risk of infection using the Wells-Riley equation were performed for the bus ventilation using 100% recirculating air without filtration, and 50% and 100% fresh air ventilation. Results indicate a high risk of infection when recirculating air is used, but the risk is reduced significantly with 50% and 100% fresh air ventilation. These results are critical to informing bus manufacturers, transit agencies, planners, and public transportation users about the potential of virus containment using a new ventilation system.
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Glynn, Peter W., Nataly Giroux, and Pierre L'Ecuyer. Stochastic Optimization by Simulation: Numerical Experiments with M/M/1 Queue in Steady-State. Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada271143.

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Olsen and Wilson. L52145 Geomechanical Analysis and Design Considerations for Thin-Bedded Salt Caverns. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011349.

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he bedded salt formations located throughout the United States are layered and interspersed with non-salt materials such as anhydrite, shale, dolomite and limestone. The salt layers often contain significant impurities. GRI and DOE have initialized this research proposal in order to increase the gas storage capabilities by providing operators with improved geotechnical design and operating guidelines for thin bedded salt caverns. Terralog has summarized the geologic conditions, pressure conditions and critical design factors that may lead to: Fracture in heterogeneous materials; Differential deformation and bedding plane slip; Propagation of damage around single and multiple cavern; Improved design recommendations for single and multiple cavern configurations in various bedded salt environments. The existing caverns within both the Permian Basin Complex and the Michigan and Appalachian Basins are normally found between 300 m to 1,000 m (1,000 ft to 3,300 ft) depth depending on local geology and salt dissolution depth. Currently, active cavern operations are found in the Midland and Anadarko Basins within the Permian Basin Complex and in the Appalachian and Michigan Basins. The Palo Duro and Delaware Basins within the Permian Basin Complex also offer salt cavern development potential. Terralog developed a number of numerical models for caverns located in thin bedded salt. A modified creep viscoplastic model has been developed and implemented in Flac3D to simulate the response of salt at the Permian, Michigan and Appalachian Basins. The formulation of the viscoplastic salt model, which is based on an empirical creep law developed for Waste Isolation Pilot Plant (WIPP) Program, is combined with the Drucker-Prager model to include the formation of damage and failure. The Permian salt lab test data provided by Pfeifle et al. 1983, are used to validate the assumptions made in the material model development. For the actual cavern simulations two baseline models are developed for single and multiple caverns, respectively. Different parameters that affect damage propagation and deformation of salt cavern, such as cavern pressure, operating conditions, cavern height/diameter ratio, overburden stiffness and roof thickness are analyzed and the respective results summarized. For multiple horizontal caverns numerical models are developed to determine the cavern interaction and the minimum safe center to center distance. A step by step methodology for operators to assess critical cavern design parameters for thin bedded salt formations is also presented.
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Li, Chunding, and John Whalley. Rebalancing and the Chinese VAT: Some Numerical Simulation Results. National Bureau of Economic Research, 2011. http://dx.doi.org/10.3386/w16686.

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Sanz, Asier`. Numerical simulation tools for PVT collectors and systems. IEA SHC Task 60, 2020. http://dx.doi.org/10.18777/ieashc-task60-2020-0006.

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The computer-based experimentation covers almost the entire activity chain of the PVT sector. The PVT community carries out very different kind of modelling and simulation labours in order to answer to very diverse needs, such as proof-of-concepts, research, design, sizing, controlling, optimization, validation, marketing, sales, O&amp;M, etc.
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Li, Chunding, and John Whalley. China's Potential Future Growth and Gains from Trade Policy Bargaining: Some Numerical Simulation Results. National Bureau of Economic Research, 2012. http://dx.doi.org/10.3386/w17826.

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