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Relevant bibliographies by topics / Movable bed models (Hydraulic engineering)

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Academic literature on the topic 'Movable bed models (Hydraulic engineering)'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Movable bed models (Hydraulic engineering)"

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Saghebian, Seyed Mahdi, Kiyoumars Roushangar, V. S. Ozgur Kirca, and Roghayeh Ghasempour. "Modeling total resistance and form resistance of movable bed channels via experimental data and a kernel-based approach." Journal of Hydroinformatics 22, no. 3 (February 17, 2020): 528–40. http://dx.doi.org/10.2166/hydro.2020.094.

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Abstract An accurate prediction of roughness coefficient in alluvial channels is of substantial importance for river management. In this study, the total and form resistance in alluvial channels with dune bedform were assessed using experimental data. First, the data of experiments carried out at the Hydraulic Laboratory of University of Tabriz was used to investigate the impact of hydraulic and sediment parameters on roughness coefficient. Then, these data were combined with other laboratory data, and the total and bedform resistance were modeled via a Gaussian Process Regression (GPR) approach. For models, developing different input combinations were considered based on flow and sediment characteristics. The obtained results from the experiments showed that the Reynolds number has a better correlation with flow resistance in comparison with other hydraulic parameters. It was found that the roughness variations due to bedform are almost between 40 and 80% of the total roughness coefficient. Also, the obtained results proved the capability of the GPR method in the modeling process. It was found that the model which took the advantages of both flow and sediment characteristics performed better compared to the other models. The sensitivity analysis results showed that the Reynolds number has the most significant impact in the prediction process.

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Samma, Hamidreza, Amir Khosrojerdi, Masoumeh Rostam-Abadi, Mojtaba Mehraein, and Yovanni Cataño-Lopera. "Numerical simulation of scour and flow field over movable bed induced by a submerged wall jet." Journal of Hydroinformatics 22, no. 2 (January 30, 2020): 385–401. http://dx.doi.org/10.2166/hydro.2020.091.

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Abstract Dam construction continues its rapid expansion around the world primarily for the purpose of hydropower generation. One important consequence of such projects is local scour at the downstream of the dam caused by outflow of excess reservoir water through spillways or bottom outlets that is associated with high velocities. The scour development endangers the dam foundation and river banks and undermines the stability of the hydraulic structures. In this study, a detailed three-dimensional (3D) flow simulation is conducted to investigate the complex fluid–sediment interactions leading to the formation of the scour hole and ridge systems downstream of a near-bottom jet. Three different bed-load equations, including Meyer-Peter–Müller, Nielsen, and Van Rijn formulas, are applied for calculating the bed-load transport rate. Comparison with a series of available experimental data shows that the Meyer-Peter–Müller equation results in better predictions than the two other relations. The performance of different turbulence models to reproduce vertical profiles of velocity and scour characteristic against the experimental data were evaluated. The vertical and horizontal profiles of the scour hole-ridge system are also compared with the corresponding experimental ones. The numerical model satisfactorily reproduces the geometric parameters representing the scour hole. However, the model overestimates the length of the scour hole.

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Gaines, Roger A., and Stephen T. Maynord. "Microscale Loose-Bed Hydraulic Models." Journal of Hydraulic Engineering 127, no. 5 (May 2001): 335–38. http://dx.doi.org/10.1061/(asce)0733-9429(2001)127:5(335).

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Vasquez, Jose A., Robert G. Millar, and Peter M. Steffler. "Two-dimensional finite element river morphology model." Canadian Journal of Civil Engineering 34, no. 6 (June 1, 2007): 752–60. http://dx.doi.org/10.1139/l06-170.

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We report the development and application of a river morphology model based on the two-dimensional depth-averaged hydrodynamic model River2D. This new movable bed version of River2D was applied to simulate the bed elevation changes in four experiments: bed aggradation due to sediment overload, bed degradation by sediment supply shut-off, knickpoint migration, and bar formation in a variable-width channel. Some conditions in these experiments involved quick changes in the upstream boundary conditions, rapidly varied flow, supercritical flow, hydraulic jumps, and secondary flows. The results of the model agreed well with measured data. Notable features of the model are the use of a flexible unstructured mesh based on triangular finite elements to provide higher spatial resolution in areas of interest and transcritical flow capabilities to simulate supercritical flow and hydraulic jumps over movable beds. Key words: numerical modeling, rivers, scour, sedimentation, two-dimensional, finite elements.

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Cui, Xinzhuang, Jiong Zhang, Darhao Chen, Shucai Li, Qing Jin, Yingjie Zheng, and Sheqiang Cui. "Clogging of pervious concrete pile caused by soil piping: an approximate experimental study." Canadian Geotechnical Journal 55, no. 7 (July 2018): 999–1015. http://dx.doi.org/10.1139/cgj-2017-0238.

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Due to their high permeability and high strength, pervious concrete piles (PCPs) can improve ground bearing capacity. However, clogging of pervious concrete in practice is a potential disadvantage. To investigate the clogging mechanism of PCPs due to sand piping, a series of laboratory simulation tests is conducted on a developed hydraulic conductivity test system. This testing demonstrates the effects of pervious concrete porosity, grading of fine movable particles, mix ratio of skeleton particles to movable particles, relative density of soil, and distance between PCPs on PCP clogging. The experimental test results show that the hydraulic conductivity of PCP decreases for approximately 70 min and then becomes relatively stable. In addition, it is observed that PCP clogging rarely occurs in cases of low pervious concrete porosity, small movable sand particle size, high sand relative density, and large pile distance. The results also show that measurement of electrical conductivity can be an alternative method of hydraulic conductivity measurement. Based on the test results, preliminary clogging models are proposed.

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Guimarães, André, Carlos Coelho, Fernando Veloso-Gomes, and Paulo A. Silva. "3D Physical Modeling of an Artificial Beach Nourishment: Laboratory Procedures and Nourishment Performance." Journal of Marine Science and Engineering 9, no. 6 (June 3, 2021): 613. http://dx.doi.org/10.3390/jmse9060613.

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Beach nourishment represents a type of coastal defense intervention, keeping the beach as a natural coastal defense system. Altering the cross-shore profile geometry, due to the introduction of new sediments, induces a non-equilibrium situation regarding the local wave dynamics. This work aims to increase our knowledge concerning 3D movable bed physical modeling and beach nourishment impacts on the hydrodynamics, sediment transport, and morphodynamics. A set of experiments with an artificial beach nourishment movable bed model was prepared. Hydrodynamic, sediment transport, and morphological variations and impacts due to the presence of the nourishment were monitored with specific equipment. Special attention was given to the number and positioning of the monitoring equipment and the inherent constraints of 3D movable beds laboratory tests. The nourishment induced changes in the beach dynamics, leading to an increase in the flow velocities range and suspended sediment concentration, and effectively increasing the emerged beach width. Predicting and anticipating the morphological evolution of the modeled beach has a major impact on data accuracy, since it might influence the monitoring equipment’s correct position. Laboratory results and constraints were characterized to help better define future laboratory procedures and strategies for increasing movable bed models’ accuracy and performance.

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Foley, Patrick M., and Aaron W. Buesing. "Discussion of “Microscale Loose-Bed Hydraulic Models” by Stephen T. Maynord." Journal of Hydraulic Engineering 128, no. 10 (October 2002): 952. http://dx.doi.org/10.1061/(asce)0733-9429(2002)128:10(952).

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Maynord, Stephen T. "Closure to “Microscale Loose-Bed Hydraulic Models” by Stephen T. Maynord." Journal of Hydraulic Engineering 128, no. 10 (October 2002): 952. http://dx.doi.org/10.1061/(asce)0733-9429(2002)128:10(952.2).

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Xiao, B. J., and L. J. Qiu. "Steady state thermal-hydraulic models of pebble bed blankets on hybrid reactors." Fusion Engineering and Design 27 (March 1995): 253–57. http://dx.doi.org/10.1016/0920-3796(95)90135-3.

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Kenfaoui, M., and C. Marche. "Comment évaluer l'érosion d'une vallée sous l'écoulement de rupture d'un barrage." Canadian Journal of Civil Engineering 13, no. 4 (August 1, 1986): 474–84. http://dx.doi.org/10.1139/l86-071.

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This laboratory experimental study deals with dam-break flows on movable beds. It demonstrates significant differences between these wave parameters and values of the same parameters estimated on fixed beds. Moreover it is shown that under specific conditions some sediment transport models for steady flows can be applied to estimate bed erosion for this particular type of flow. Key words: dam, dam-break, break flows, erosion, laboratory tests.

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Dissertations / Theses on the topic "Movable bed models (Hydraulic engineering)"

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Teakle, Ian Alan Lester. "Coastal boundary layer and sediment transport modelling /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19317.pdf.

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Cottino, Christian Filippo Giuseppe. "An experimental study of flow around bed forms." Thesis, 2014.

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Books on the topic "Movable bed models (Hydraulic engineering)"

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Shen, Hsieh Wen. Movable Bed Physical Models. Dordrecht: Springer Netherlands, 1990.

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NATO Advanced Research Workshop on Movable Bed Physical Models (1987 Delft, Netherlands). Movable bed physical models. Dordrecht: Kluwer Academic Publishers, 1990.

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Shen, Hsieh Wen. Movable Bed Physical Models. Springer, 2011.

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4

Hydraulics Laboratory (U.S.), ed. Jefferson Barracks Bridge: Movable-bed model study. Vicksburg, Miss: US Army Corps of Engineers, Hydraulics Laboratory, 1988.

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5

R. S. M. Mizanur Rashid. Numerical modeling of two-dimensional, unsteady sediment transport and bed evolution in open channels. 1995.

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Book chapters on the topic "Movable bed models (Hydraulic engineering)"

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Zhang, Chunman, Hongwu Zhang, and Peiqing Liu. "Study on the Mathematical Model of Non-Steady Water-Sand Movable Bed of Sedimentation Reservoir." In Advances in Water Resources and Hydraulic Engineering, 1005–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_176.

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Conference papers on the topic "Movable bed models (Hydraulic engineering)"

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Shepherd, Ian E. "The Measurement of Bed Form Shapes in Hydraulic Models." In 25th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1997. http://dx.doi.org/10.1061/9780784402429.245.

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Sun, Peiwei, and Jin Jiang. "Thermal-Hydraulic Modeling of CANDU-SCWR and Linear Dynamic Model Development." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29780.

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CANDU-SCWR is one Generation IV reactor being developed in Canada. Significant amount of efforts has been made to develop CANDU-SCWR. Little work has been done on the dynamic analysis and control design. To observe the dynamic behaviours of CANDU-SCWR, the detailed CANDU-SCWR thermal-hydraulic model is developed. The movable boundary method is adopted for CANDU-SCWR thermal-hydraulic modeling. The benefits of adopting movable boundary are derived from the comparisons with the fixed boundary method. The steady-state results agree well with the design data. The responses of CANDU-SCWR reactor to different disturbances are simulated and analyzed and the results are reasonable in theory. Linear dynamic models are derived from simulation data of CANDU-SCWR thermal-hydraulic model around the design operating point using a system identification technique to facilitate the control system design. The linear dynamic models are validated and it is shown that they can describe the dynamic characteristics of CANDU-SCWR around the design point accurately.

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Sui, Zhe, Jun Sun, Chunlin Wei, Yuanle Ma, and Wenzhi Shan. "Coupled Neutron Dynamic and Thermal Hydraulic Models of the HTR Simulator." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15106.

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Along with the design and construction of the high temperature reactor pebble bed module (HTR-PM), the engineering simulator system (ESS) has been accomplished to deal with the key techniques of the HTR simulator. In our previous papers, the three dimensional space-time neutron dynamics and the thermal hydraulic modeling of the HTR reactor core were introduced. In this paper, we concentrated on the detailed coupling techniques of the neutron dynamic and thermal hydraulic models, which was one of the most important assurances to the dynamic simulations of the HTR-PM. The mechanism of minus temperature feedback effect of the HTR was introduced by the materials participated in the coupling calculations, as well as those parameters being transferred. In parallel calculations, the neutron dynamics and thermal hydraulics were coupled by exchanging the power density and the temperature in fuels, moderates, reflectors and so on. With complete reactor core model, the coupling calculations of the neutron dynamics and thermal hydraulics were tested in many static and dynamic cases to show good performances. Based on that model ability, the ESS can simulate the start-up, shut-down and several accidents for the whole nuclear power plant.

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Mehdizadeh, A., B. Firoozabadi, and S. A. Sherif. "Numerical Simulation of Submerged Flows With Baffles Using v2-f- and k-e Turbulence Models." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14304.

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This paper introduces the concept of a submerged hydraulic jump being used for energy dissipation. A baffle wall is used to produce a stable deflected surface jet, thereby deflecting the high-velocity supercritical stream away from the bed to the surface. An elliptic relaxation turbulence model ([Equation] - f model) has been used to simulate this submerged flow. During the last few years, the [Equation] - f turbulence model has become increasingly popular due to its ability to account for near-wall damping without use of damping functions. In addition, it has been proved that the [Equation] - f model is superior to other RANS methods in many fluid flows where complex flow features are present. In this study, we compared the results of both models with each other and with available experimental data. In addition, based on a series of numerical simulations, a diagram was developed that predicts the effect of baffle position on the friction coefficient over the bed. This feature should help preventing or reducing erosion over the bed. Moreover, we have shown that in numerical simulation, like experimental data, in some cases the flow regimes of submerged flow with baffles can either be a deflected surface jet or reattached wall jet.

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Dai, Chunhui, Jun Wu, Sichao Tan, Zhenxing Zhao, Qi Xiao, Zhouyang Liu, and Yong Liu. "Research on Thermal Hydraulic Characteristics of Passive Containment Cooling System for Ship Nuclear Power Platform." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60173.

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Ship nuclear power platform is a small and movable power plant on the sea, aiming at generating electric energy and producing fresh water, it provides support for the national energy strategy. Subsequent to a loss of coolant accident (LOCA), steam is vented in the reactor containment following vaporization of liquid and/or steam expansion. The temperature as well as pressure in the condensation rises synchronously. For removing heat and reducing pressure inside containment subsequent to a LOCA, the Passive containment cooling system of Ship nuclear power platform is designed. In order to establish and maintain the passive heat removing channel, steam condenses on the containment condenser tube surface, coupling natural convection of the seawater inside the tubes. The heat transfer mechanism of Passive containment cooling system is very complex. To solve this problem, a three dimensional heat exchanging/one dimensional natural circulation coupling numerical computing method is proposed to obtained the safety performance of the reactor containment. Models of heat exchanging process between steam which contains non-condensable gas inside the reactor containment and sea water outside are firstly established. Then the thermal-hydraulic characteristics of the steam and sea water beside the heat transfer tubes are obtained by a simulation which is carried out in a LOCA.

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Guo, Liancheng, Koji Morita, Hirotaka Tagami, and Yoshiharu Tobita. "Validation of a 3D Hybrid CFD-DEM Method Based on a Self-Leveling Experiment." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30618.

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The postulated core disruptive accidents (CDAs) are regarded as particular difficulties in the safety analysis of liquid-metal fast reactors (LMFRs). In the CDAs, core debris may settle on the core-support structure and form conic bed mounds. Heat convection and vaporization of coolant sodium will level the debris bed, which is named “self-leveling behavior” of debris bed. To reasonably simulate such transient behavior, as well as thermal-hydraulic phenomena occurring during a CDA, a comprehensive computational tool is needed. The SIMMER code is a successful computer code developed as an advanced tool for CDA analysis of LMFRs. It is a multi-velocity-field, multiphase, multicomponent, Eulerian, fluid dynamics code coupled with a fuel-pin model and a space- and energy-dependent neutron kinetics model. Until now, the code has been successfully applied to simulations of key thermal-hydraulic phenomena involved in CDAs as well as reactor safety assessment. However, strong interactions among rich solid particles as well as particle characteristics in multiphase flows were not taken into consideration for its fluid-dynamics models. Therefore, a hybrid computational method was developed by combining the discrete element method (DEM) with the multi-fluid models to reasonably simulate the particle behaviors, as well as the thermal-hydraulic phenomena of multiphase fluid flows. In this study, 3D numerical simulation of a simplified self-leveling experiment is performed using the hybrid method. Reasonable agreement between simulation results and corresponding experimental data demonstrated the validity of the present method in simulating the self-leveling behavior of debris bed.

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Xiao, Yao, Lin-wen Hu, Suizheng Qiu, Dalin Zhang, Guanghui Su, and Wenxi Tian. "Development of a Thermal-Hydraulic Analysis Code and Transient Analysis for a FHTR." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30615.

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The Fluoride-salt-cooled High-temperature Reactor (FHR) is an advanced reactor concept that uses high temperature TRISO fuel with a low-pressure liquid salt coolant. Design of Fluoride-salt-cooled High-temperature Test Reactor (FHTR) is a key step in the development of the FHR technology and is currently in progress both in China and the United States. An FHTR based on pebble bed core design with coolant temperature 600–700 °C is being planned for construction by the Chinese Academy of Sciences (CAS)’s Thorium Molten Salt Reactor (TMSR) Research Center, Shanghai Institute of Applied Physics (SINAP). This paper provides preliminary thermal hydraulic transient analyses of an FHTR using SINAP’s pebble core design as a reference case. A point kinetic model is calculated by developing a microcomputer code coupling with a simplified porous medium heat transfer model in the core. The founded models and developed code are applied to analyze the safety characteristics of the FHTR by simulating basic transient conditions including the unprotected loss of flow, unprotected overcooling, and unprotected transient overpower accidents. The results show that the SINAP’s pebble core design is an inherently safe reactor design.

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Saarikoski, Tuomas, and Matti Pietola. "HIL Simulation of Elastomer Supported Machine Bed Dynamics." In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7847.

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This paper presents a Hardware-in-the-Loop (HIL) test setup used for studying the dynamics of an elastomer supported machine bed. The setup uses real elastomer dampers and modeled machine dynamics (process model) connected together via real-time interface. The HIL approach was chosen since the elastomers are a critical part of the system, however, determining their properties for engineering needs can be a challenging task. Accurate elastomer models include many parameters that can only be determined by experimentally, and even then their implementation for real-life applications is not always practical. Using real elastomers supports in the simulation removes uncertainties associated with classic elastomer models, while simulated process makes it possible to test different scenarios fast and with good repeatability. The process model includes a description of the machine body, a rotating unbalanced drive mechanism creating cyclic loading and external excitation forces acting on the machine. The method enables testing of machine bed supports in a realistic operating environment. A test rig was built for housing the elastomers incorporating a hydraulic actuator for producing the process movement. The hydraulic circuit was designed for good dynamic performance with predictive control to minimize delays in the real-time interface. It was found that the HIL-setup can provide fast and accurate information about the plant model behavior in different operating scenarios using the elastomer supports.

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Wang, Jie, Guanghui Su, Wenxi Tian, and Suizheng Qiu. "Development of a Thermal-Hydraulic Code for Chinese Helium-Cooled Ceramic Breeder TBM Cooling System." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15153.

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Helium was chosen as the coolant for divertor cooling loop, Korea helium cooled solid breeder TBM, European helium cooled pebble bed TBM and Chinese helium cooled ceramic breeder TBM. The thermal-hydraulic analysis for the divertor cooling loop and the TBM cooling systems were carried out by RELAP5 and MELOCR codes, which were developed for transient simulation of light water reactor coolant system during postulated accidents. In this study, a thermal-hydraulic and safety analysis code (TSACO) for helium cooling system was developed and calculation of the Chinese HCCB TBM cooling system was presented. Heat transfer and flow friction models for helium were added in the code. First, the code was verified by comparing with the RELAP5 code with the same initial and boundary conditions. The first wall temperature, pressure drop and inlet/outlet temperatures were studied and a good agreement was obtained, then ex-vessel loss of coolant accident for Chinese HCCB-TBM cooling system was investigated using TSACO. The results show that the TBM can be cooled efficiently and the TCWS pressure stays within the design limits with a large margin.

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Sarraf Shirazi, Alireza, and Ian Frigaard. "A New Three-Layer Model for Gravel Packing Applications in Horizontal Wells." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95164.

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Abstract In [1] we have developed a modified three-layer model for solid-liquid flow in horizontal pipes, which overcomes the limitations of previous mechanistic models. The steady-state model predicts the pressure loss, critical velocity, concentration profile in the heterogeneous layer, mean heterogeneous layer and moving bed layer velocities, and bed layer heights for each set of parameters. The steady-state model predictions show very good agreement with experimentally measured results in the literature. In this paper we extend the steady-state three-layer model to annular geometries and apply it to the design of open-hole gravel packing operations, in the typical parameter ranges of gravel packing operations for alpha wave placements. Alpha wave design is a key factor for successful gravel packing, and the models typically used are either based on small-scale experiments or are not specifically developed for gravel packing, e.g. cuttings transport models. In gravel packing the hydraulic configuration is slightly different. We explain how bed height is selected via coupling between the inner and outer annuli and from the outer annulus hydraulics. We investigate the effects of important parameters such as the slurry flow rate, mean solids concentration, wash pipe diameter, etc. on gravel packing operations.

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