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Journal articles on the topic 'CFD simulation'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 September 2023

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1

Misar, Adit, Phillip Davis, and Mesbah Uddin. "On the Effectiveness of Scale-Averaged RANS and Scale-Resolved IDDES Turbulence Simulation Approaches in Predicting the Pressure Field over a NASCAR Racecar." Fluids 8, no. 5 (May 16, 2023): 157. http://dx.doi.org/10.3390/fluids8050157.

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Racecar aerodynamic development requires well-correlated simulation data for rapid and incremental development cycles. Computational Fluid Dynamics (CFD) simulations and wind tunnel testing are industry-wide tools to perform such development, and the best use of these tools can define a race team’s ability to compete. With CFD usage being limited by the sanctioning bodies, large-scale mesh and large-time-step CFD simulations based on Reynolds-Averaged Navier–Stokes (RANS) approaches are popular. In order to provide the necessary aerodynamic performance advantages sought by CFD development, increasing confidence in the validity of CFD simulations is required. A previous study on a Scale-Averaged Simulation (SAS) approach using RANS simulations of a Gen-6 NASCAR, validated against moving-ground, open-jet wind tunnel data at multiple configurations, produced a framework with good wind tunnel correlation (within 2%) in aerodynamic coefficients of lift and drag predictions, but significant error in front-to-rear downforce balance (negative lift) predictions. A subsequent author’s publication on a Scale-Resolved Simulation (SRS) approach using Improved Delayed Detached Eddy Simulation (IDDES) for the same geometry showed a good correlation in front-to-rear downforce balance, but lift and drag were overpredicted relative to wind tunnel data. The current study compares the surface pressure distribution collected from a full-scale wind tunnel test on a Gen-6 NASCAR to the SAS and SRS predictions (both utilizing SST k−ω turbulence models). CFD simulations were performed with a finite-volume commercial CFD code, Star-CCM+ by Siemens, utilizing a high-resolution CAD model of the same vehicle. A direct comparison of the surface pressure distributions from the wind tunnel and CFD data clearly showed regions of high and low correlations. The associated flow features were studied to further explore the strengths and areas of improvement needed in the CFD predictions. While RANS was seen to be more accurate in terms of lift and drag, it was a result of the cancellation of positive and negative errors. Whereas IDDES overpredicted lift and drag and requires an order of magnitude more computational resources, it was able to capture the trend of surface pressure seen in the wind tunnel measurements.
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Wu, Qunyong, Yuhang Wang, Haoyu Sun, Han Lin, and Zhiyuan Zhao. "A System Coupled GIS and CFD for Atmospheric Pollution Dispersion Simulation in Urban Blocks." Atmosphere 14, no. 5 (May 5, 2023): 832. http://dx.doi.org/10.3390/atmos14050832.

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Atmospheric pollution is a critical issue in public health systems. The simulation of atmospheric pollution dispersion in urban blocks, using CFD, faces several challenges, including the complexity and inefficiency of existing CFD software, time-consuming construction of CFD urban block geometry, and limited visualization and analysis capabilities of simulation outputs. To address these challenges, we have developed a prototype system that couples 3DGIS and CFD for simulating, visualizing, and analyzing atmospheric pollution dispersion. Specifically, a parallel algorithm for coordinate transformation was designed, and the relevant commands were encapsulated to automate the construction of geometry and meshing required for CFD simulations of urban blocks. Additionally, the Fluent-based command flow was parameterized and encapsulated, enabling the automatic generation of model calculation command flow files to simulate atmospheric pollution dispersion. Moreover, multi-angle spatial partitioning and spatiotemporal multidimensional visualization analysis were introduced to achieve an intuitive expression and analysis of CFD simulation results. The result shows that the constructed geometry is correct, and the mesh quality meets requirements with all values above 0.45. CPU and GPU parallel algorithms are 13.3× and 25× faster than serial. Furthermore, our case study demonstrates the developed system’s effectiveness in simulating, visualizing, and analyzing atmospheric pollution dispersion in urban blocks.
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Ridzuan, Nurfairunnajiha, Uznir Ujang, Suhaibah Azri, and Izham Mohamad Yusoff. "Computational Fluid Dynamics of Wind Flow and Air Pollution Modelling: A Review on 3D Building Model Standards." IOP Conference Series: Earth and Environmental Science 1064, no. 1 (July 1, 2022): 012051. http://dx.doi.org/10.1088/1755-1315/1064/1/012051.

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Abstract Computational Fluid Dynamics (CFD) simulations are used to monitor air pollution events supported by real-world conditions digitally. Besides, wind flow that has a close relationship with air pollutants dispersion also can be visualized by using CFD simulation. The presence of a building, especially in terms of the building’s geometry, impacts the air pollution dispersion and wind flow that occur around a building or in a specific research area. As there is an involvement of building models in the simulation, some of the standards for the building modelling: Computer-Aided Design (CAD), City Geographic Markup Language (CityGML), and Building Information Modelling (BIM), are being utilized in this type of study. Many types of research have been conducted to study the pollutants and wind flow using the CFD technique of these three standards. Hence, this review paper is used to presents several pieces of research on this related topic. Through this review paper, some of the drawbacks of the study were identified, such as the detailing of the building’s geometry and the compatibility of each standard to be implemented in the CFD simulation.
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Augst, A. D., D. C. Barratt, A. D. Hughes, F. P. Glor, S. A. McG Thom, and X. Y. Xu. "Accuracy and Reproducibility of CFD Predicted Wall Shear Stress Using 3D Ultrasound Images." Journal of Biomechanical Engineering 125, no. 2 (April 1, 2003): 218–22. http://dx.doi.org/10.1115/1.1553973.

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Computational fluid dynamics (CFD) flow simulation techniques have the potential to enhance our understanding of how haemodynamic factors are involved in atherosclerosis. Recently, 3D ultrasound has emerged as an alternative to other 3D imaging techniques, such as magnetic resonance angiography (MRA). The method can be used to generate realistic vascular geometry suitable for CFD simulations. In order to assess accuracy and reproducibility of the procedure from image acquisition to reconstruction to CFD simulation, a human carotid artery bifurcation phantom was scanned three times using 3D ultrasound. The geometry was reconstructed and flow simulations were carried out on the three sets as well as on a model generated using computer aided design (CAD) from the geometric information given by the manufacturer. It was found that the three reconstructed sets showed good reproducibility as well as satisfactory quantitative agreement with the CAD model. Analyzing two selected locations probably representing the ‘worst cases,’ accuracy comparing ultrasound and CAD reconstructed models was estimated to be between 7.2% and 7.7% of the maximum instantaneous WSS and reproducibility comparing the three scans to be between 8.2% and 10.7% of their average maximum.
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Huo, Hongyuan, Fei Chen, Xiaowei Geng, Jing Tao, Zhansheng Liu, Wenzhi Zhang, and Pei Leng. "Simulation of the Urban Space Thermal Environment Based on Computational Fluid Dynamics: A Comprehensive Review." Sensors 21, no. 20 (October 18, 2021): 6898. http://dx.doi.org/10.3390/s21206898.

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Rapid urbanization has made urban space thermal environment (USTE) problems increasingly prominent. USTE research is important for improving urban ecological environment and building energy consumption. Most studies on USTE research progress have focused on meteorological observations and remote sensing methods, and few studies on USTE are based on computational fluid dynamics (CFD). During the past two decades, with the increasing applications of CFD in USTE research, comprehensively summarizing the phased results have become necessary tasks. This paper analyzes the current research status of CFD-based USTE simulation from six perspectives. First, we summarize the current research status of USTE simulation with CFD models that integrate ground observations and remote sensing technology. Second, we define and classify the spatial scope of CFD-based USTE simulations at different scales. Third, we systematically analyze the quantitative relationships among urban land type, the underlying surface structure, water bodies, green space and the corresponding changes in CFD-based USTE simulations. Fourth, we quantitatively analyze the impact of anthropogenic heat in CFD-based USTE simulations. Fifth, we summarize the corresponding USTE mitigation measures and methods based on the CFD simulation results. Finally, the outlooks and the existing problems in current research on CFD simulations of the USTE are analyzed.
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Tastan, Zafer, Christoph Capellmann, and Marcus Matthes. "CFD-Simulation verbessert Scheibenenteisung." ATZ - Automobiltechnische Zeitschrift 105, no. 4 (April 2003): 338–44. http://dx.doi.org/10.1007/bf03224460.

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7

Pieloth, D., A. Moser, G. Schaldach, and P. Walzel. "CFD-Simulation von Wäschern." Chemie Ingenieur Technik 86, no. 9 (August 28, 2014): 1614. http://dx.doi.org/10.1002/cite.201450616.

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Cui, Hong Jiang, Ming Hai Li, and Ying Guan. "The Performance Simulation and Optimization Research on Intake Port of Locomotive Diesel Engine." Advanced Materials Research 443-444 (January 2012): 1007–13. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.1007.

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.In order to manufacture high quality intake port with bigger discharge coefficient and appropriate swirl ratio for diesel engine performance improvement, intake port tests and CFD simulation method were combined together to optimize its structure. The three-dimensional CAD model of intake port was built and was putted into AVL–FIRE platform to do CFD simulation with appropriate turbulence model and calculation method. The detailed air flow information was obtained by CFD simulation. After analyzing, two optimization programs were discussed. This research shows that CFD simulation is a powerful method to design diesel engine intake port; air flow condition is complex in the intake port; intake port structure optimization can increase the discharge coefficient and improve the air flow condition.
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Perić, M. "Simulation of Flows in Complex Geometries: New Meshing and Solution Methods." NAFEMS International Journal of CFD Case Studies 6 (March 2007): 27–37. http://dx.doi.org/10.59972/utux3hbg.

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The use of CFD is spreading in all areas of engineering. The flow domains are usually very complicated, which places high demands on both meshing and solution methods. In this manuscript the newest developments in the handling of complex geometries in CFD are presented. The limitations with respect to the shape of control volumes that may appear in a numerical grid are lifted: cells of arbitrary polyhedral shape are allowed. CAD-integration of all CFD tools and automatic generation of polyhedral meshes, as well as a solution method that can use such meshes, are also presented and the advantages of the new technology are discussed. The emphasis is on CAD integration, automatic mesh generation, and optimisation of mesh quality. The aim of all of these measures is the shortening of analysis time in all phases of a CFD simulation and at the same time an improvement of solution quality.
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Roman, Vitalii, Fedir Matiko, and Igor Kostyk. "Investigation of Turbulence Parameters Influence on Results of CFD Modeling of Flow in Ultrasonic Flowmeter." Energy Engineering and Control Systems 7, no. 1 (2021): 73–78. http://dx.doi.org/10.23939/jeecs2021.01.073.

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The article investigated the influence of turbulence parameters of the SolidWorks Flow Simulations CFD package on the results of flow simulation in a two-path ultrasonic flowmeter. It has been found that the main turbulence parameters of SolidWorks Flow Simulations (turbulence intensity, turbulence length, turbulence energy and turbulence dissipation) slightly affect the result of the flow simulation in a full-filled pipeline of circular profile without additional turbulous elements (turbine, rotor, other). In view of this, during the CFD modeling of the flow measurement process using ultrasonic flowmeters, it is recommended to apply turbulence parameters installed in the SolidWorks Flow Simulations CFD package by default. At the same time, the time consumed by the computer to perform CFD modeling is almost unchanged when the specified parameters of the SolidWorks Flow Simulations CFD package.
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Hu, Yongyu, Fusuo Xu, and Zhi Gao. "A Comparative Study of the Simulation Accuracy and Efficiency for the Urban Wind Environment Based on CFD Plug-Ins Integrated into Architectural Design Platforms." Buildings 12, no. 9 (September 19, 2022): 1487. http://dx.doi.org/10.3390/buildings12091487.

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The deterioration of the urban environment is a problem which has captured the attention of governmental departments and researchers, who are committed to improving the urban environment from the perspective of optimizing urban morphology. Although many researchers have applied computational fluid dynamics (CFD) plug-ins to study the problems of urban ventilation and pollutant accumulation, studies on the reliability and simulation accuracy verification of CFD plug-ins are currently scarce. Therefore, we used three CFD plug-ins based on different architectural design platforms to evaluate and compare their operation difficulty, simulation accuracy, and efficiency through the analysis of the simulation results of urban ventilation. This study complements the reliability validation of CFD plug-in simulations and guides urban planners and architects in the selection and application of CFD plug-ins. The results show that the CFD plug-in generally underestimates the wind speed at the pedestrian level and the prediction accuracy is poor in the wake area of obstacles, especially with the GH_Wind plug-in. Under the 0° inflow direction, the simulation results of the Butterfly plug-in were the most consistent with the experimental values. When the inflow direction increased to 22.5° and 45°, the Autodesk CFD showed the best simulation accuracy. Overall, Autodesk CFD achieves a balance between simulation accuracy and speed in urban airflow simulation.
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Xu, Qing, Yu-Xing Li, Xiao-Ning Li, Jia-Bin Wang, Fan Yang, Yi Yang, and Tian-Ling Ren. "Simulation of SiO2 etching in an inductively coupled CF4 plasma." Modern Physics Letters B 31, no. 06 (February 28, 2017): 1750042. http://dx.doi.org/10.1142/s0217984917500427.

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Plasma etching technology is an indispensable processing method in the manufacturing process of semiconductor devices. Because of the high fluorine/carbon ratio of CF4, the CF4 gas is often used for etching SiO2. A commercial software ESI-CFD is used to simulate the process of plasma etching with an inductively coupled plasma model. For the simulation part, CFD-ACE is used to simulate the chamber, and CFD-TOPO is used to simulate the surface of the sample. The effects of chamber pressure, bias voltage and ICP power on the reactant particles were investigated, and the etching profiles of SiO2 were obtained. Simulation can be used to predict the effects of reaction conditions on the density, energy and angular distributions of reactant particles, which can play a good role in guiding the etching process.
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Ohsaki, Shuji, Ryosuke Mitani, Saki Fujiwara, Hideya Nakamura, and Satoru Watano. "Numerical Simulation of Particle Motions in Cascade Impactor and Human Respiratory System." MATEC Web of Conferences 333 (2021): 02013. http://dx.doi.org/10.1051/matecconf/202133302013.

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Dry powder inhalations (DPIs) have gathered attention as a treatment for respiratory diseases due to the large effective absorption area in a human lung. A cascade impactor is generally used to investigate the inhalation performance of DPIs. For the improvement of the efficiency of DPIs, understanding the particle motion and deposition behavior in the human lung and the cascade impactor is required. In the present study, computer simulations were conducted to calculate the particle motion and deposition behavior in the human lung and the cascade impactor. As simulation methods, a coupling model of a computational fluid dynamics and a discrete phase method (CFD−DPM) and a coupling model of a CFD and a discrete element method (CFD−DEM) were used. The CFD−DEM simulation could reproduce the experimental particle deposition behavior in the cascade impactor, although it was difficult by the CFD−DPM simulation. Furthermore, the calculation results using the CFD−DEM simulation quantitatively demonstrated the higher particle reachability into the simple lung model when smaller particles were used. It was found that the CFD−DEM simulation is a powerful tool to calculate the particle motion and deposition behavior in the cascade impactor and human lung.
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Ohsaki, Shuji, Ryosuke Mitani, Saki Fujiwara, Hideya Nakamura, and Satoru Watano. "Numerical Simulation of Particle Motions in Cascade Impactor and Human Respiratory System." MATEC Web of Conferences 333 (2021): 02013. http://dx.doi.org/10.1051/matecconf/202133302013.

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Dry powder inhalations (DPIs) have gathered attention as a treatment for respiratory diseases due to the large effective absorption area in a human lung. A cascade impactor is generally used to investigate the inhalation performance of DPIs. For the improvement of the efficiency of DPIs, understanding the particle motion and deposition behavior in the human lung and the cascade impactor is required. In the present study, computer simulations were conducted to calculate the particle motion and deposition behavior in the human lung and the cascade impactor. As simulation methods, a coupling model of a computational fluid dynamics and a discrete phase method (CFD−DPM) and a coupling model of a CFD and a discrete element method (CFD−DEM) were used. The CFD−DEM simulation could reproduce the experimental particle deposition behavior in the cascade impactor, although it was difficult by the CFD−DPM simulation. Furthermore, the calculation results using the CFD−DEM simulation quantitatively demonstrated the higher particle reachability into the simple lung model when smaller particles were used. It was found that the CFD−DEM simulation is a powerful tool to calculate the particle motion and deposition behavior in the cascade impactor and human lung.
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CHO, SU K., and VAMSHI M. KORIVI. "PORT DESIGN OPTIMIZATION USING CFD ANALYSIS." Journal of Advanced Manufacturing Systems 03, no. 01 (June 2004): 21–32. http://dx.doi.org/10.1142/s0219686704000375.

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Shape of ports that are part of an engine cylinder head is vital to engine performance and emissions. The advance of CFD (Computation Fluid Dynamics) analysis technology helps designers run the simulation to improve the port design and to provide the better model for a flow bench test. This paper presents the automation of design optimization process integrating CAD modeling, mesh generation and CFD simulation.
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Morvan, Hervé P. "Automating CFD for non-experts." Journal of Hydroinformatics 7, no. 1 (January 1, 2005): 17–29. http://dx.doi.org/10.2166/hydro.2005.0003.

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The focus of the paper is on demonstrating how it is possible to automate complex CFD simulations using scripting language around and within the structure of the CFD command files. To illustrate this, the concept of an atmospheric pollution case is used and, more specifically, that of a water treatment plant. The code that is used is CFX-5 with PERL as a scripting ‘language’. The simulation of the factory atmospheric environment and its fluctuating conditions are fully automated. The simulation is based on a pre-defined generic CFD model, for which initial conditions, boundary conditions and source terms of atmospheric pollutant release are written automatically by the scripts using data recorded by measuring devices and stored on computers every half an hour as the simulation runs. When the correct amount of time has elapsed, the simulation pauses and the script updates the set-up using the newly recorded data. It then proceeds further, restarting from the appropriate result files. At each pause, a HTML report is also produced, which contains pictures of the area and summary tables. If a suitable criterion is defined in the post-treatment algorithm, such as a critical concentration for example, an alarm bell can be started, so that the technician knows the simulation has found a potential problem within the large domain that is thus monitored. The implications of this work are numerous. Firstly, non-CFD experts can run and use results from a CFD simulation without having to implement the models, run the simulation or fully understand the intricacy of the physics and mathematics that it contains. Going further, it is even possible to parametrize the generic model set-up, e.g. the domain dimensions or the location of emission sources, to make the case more flexible. Running the application remotely is also possible, using a web browser to submit the necessary input to the CFD code. Secondly, a very wide area can be monitored numerically, which would not be commercially viable with physical devices and field monitoring campaigns. Thirdly, such a simulation can be used to learn the general behaviour of, and the potential problems associated with, the region of interest and eventually set up a response plan to any given situation known to cause discomfort or form a health hazard to the neighbourhood. This feedback can be used to improve the operation of the plant and its safety, but also to enhance the model set-up for future simulations.
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Zhang, Xinfang, Miao Li, Bomin Wang, and Zexian Li. "A Parameter Correction method of CFD based on the Approximate Bayesian Computation technique." Journal of Physics: Conference Series 2569, no. 1 (August 1, 2023): 012076. http://dx.doi.org/10.1088/1742-6596/2569/1/012076.

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Abstract Numerical simulation and modeling techniques are becoming the primary research tools for aerodynamic analysis and design. However, various uncertainties in physical modeling and numerical simulation seriously affect the credibility of Computational Fluid Dynamics (CFD) simulation results. Therefore, CFD models need to be adjusted and modified with consideration of uncertainties to improve the prediction accuracy and confidence level of CFD numerical simulations. This paper presents a parameter correction method of CFD for aerodynamic analysis by making full use of the advantages of the Approximate Bayesian Computation (ABC) technique in dealing with the analysis and inference of complex statistical models, in which the parameters of turbulence models for CFD are inferenced. The proposed parameter correction method is applied to the aerodynamic prediction of the NACA0012 airfoil. The results show the feasibility and effectiveness of the proposed approach in improving CFD prediction accuracy.
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Ribeiro, J. A., A. S. Reis, P. S. Avendaño, C. H. Ataíde, and Marcos A. S. Barrozo. "Experimental and CFD Simulation of a Bubble Column." Materials Science Forum 727-728 (August 2012): 1824–29. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1824.

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The numerical simulation in fluid mechanics has large application in chemical engineering. The objective of the present work is the analyze of a computational model for the fluid dynamics behaviour of a bubble column of the geometry cylindrical non regular with multiphase mixture. Experimental data and CFD results of the hydrodynamics of gaseous and liquid phases have been compared. Five different diameters of bubbles have been used in the CFD simulations. The comparisons between CFD simulations and experimental data show that the Eulerian-Eulerian approach provides a computational model that represents the process satisfactorily.
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Scurtu, I. L., and M. I. Gheres. "Numerical evaluation of vehicles aerodynamics in platoon using CFD simulation." IOP Conference Series: Materials Science and Engineering 1220, no. 1 (January 1, 2022): 012024. http://dx.doi.org/10.1088/1757-899x/1220/1/012024.

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Abstract Due to increased traffic and new technologies developed to improve road safety, a new vehicle driving technique is being studied. The vehicles’ platooning driving method has as objective to minimize the aerodynamic drag and therefore the fuel consumption. The aim of this study is to evaluate the distance between platoon traveling vehicles and to propose an optimal travel distance. The CFD evaluation is performed for two categories of vehicles at a given velocity and distance between them for two cases: in the first simulation scenario, a tractor-trailer is represented, followed by a SUV positioned at a given distance from the rear of the vehicle combination; in the second simulation, two tractor-trailers at the same boundary condition as for the first case are simulated. The vehicles models are made by using a CAD modelling environment, respecting the overall dimensions of an existing vehicle. The numerical evaluation of a distance between vehicle models is performed using the CFD method based on the Navier-Stokes equations averaging. The last part of the paper presents the interpretation of CDF simulation results, establishing the recommended travel distance between vehicles and conclusions of this study.
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Guo, Zhong Quan, Jian Xia Liu, and Wen Cai Luo. "Parametric Modeling and Simulation for Aerodynamic Design of Launch Vehicle." Applied Mechanics and Materials 101-102 (September 2011): 697–701. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.697.

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Aerodynamic design of launch vehicle is facing combinatorial explosion problem caused by modular design. In order to get basic feasible solution from huge design space, the efficiency of design and simulation must be improved. In this paper, a parametric modeling and simulation method is proposed, which is based on CAD/CFD tools. Firstly, the design Variables of the launch vehicle are divided into three categories: size parameters, configuration parameters and mesh parameters. Secondly, parametric geometry model, including size and configuration parameters, is obtained by secondary development of Pro/ENGINEER. Thirdly, parametric mesh files for CFD are generated by implementing CFD-GEOM with scripts written in Python. By specifying boundary conditions through command stream of GAMBIT, FLUENT software will run automatically to calculate the aerodynamic performance of the launch vehicle. Finally, a graphical user interface (GUI) is developed using VC++6.0. With this system, the integration of CAD/CFD application is achieved. As long as designers enter certain design parameters in the GUI, they will quickly achieve 3D geometry model and aerodynamic performance of the launch vehicle. Application examples show that, this system can significantly improve the efficiency of aerodynamic design of the launch vehicle, and the data error between simulation and experiment is less than 10%, which is acceptable.
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Močilan, Martin, Milan Žmindák, Peter Pecháč, and Peter Weis. "CFD Simulation of Hydraulic Tank." Procedia Engineering 192 (2017): 609–14. http://dx.doi.org/10.1016/j.proeng.2017.06.105.

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Ekambara, K., and M. T. Dhotre. "CFD simulation of bubble column." Nuclear Engineering and Design 240, no. 5 (May 2010): 963–69. http://dx.doi.org/10.1016/j.nucengdes.2010.01.016.

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23

Dehaeze, F., K. D. Baverstock, and G. N. Barakos. "CFD simulation of flapped rotors." Aeronautical Journal 119, no. 1222 (December 2015): 1561–83. http://dx.doi.org/10.1017/s0001924000011404.

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AbstractThe use of active trailing edge flaps on rotors may lead to performance benefits as well as noise and vibration reduction. In this work, computational fluid dynamics, using the HMB2 solver, is used to assess the effect of the trailing edge flaps on the whole flight domain of a modern main rotor. Starting from a baseline blade design, multiple techniques are demonstrated. The flap is first assessed using 2D pitching aerofoil simulations, followed by dMdt simulations, that account for the simultaneous variations of pitch and Mach around the azimuth. It was shown that enhanced lift was obtained while inspection of the moment coefficient showed negative damping for the flap for a limited set of conditions. Due to the 2D formulation, dMdt computations are fast to perform and can be used to inform codes predicting the rotor performance. The flap was then assessed in hover, and only allowed for limited improvement in blade performance at high thrust. In forward flight, the flap was actuated at a frequency of 1 per revolution, and was found to have a strong effect on the loads on the retreating side. The effect on the moments was even stronger. The flight envelope of the blade was explored, and clean and flapped cases were compared. The most noticeable changes occur at high and medium thrust. The CFD method was found to be efficient and robust, without any substantial penalties in CPU time, due to the flap modelling, over the tested conditions.
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Bartak, M., I. Beausoleil-Morrison, J. A. Clarke, J. Denev, F. Drkal, M. Lain, I. A. Macdonald, A. Melikov, Z. Popiolek, and P. Stankov. "Integrating CFD and building simulation." Building and Environment 37, no. 8-9 (August 2002): 865–71. http://dx.doi.org/10.1016/s0360-1323(02)00045-8.

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Zink, Florian, Jeffrey Vipperman, and Laura Schaefer. "CFD simulation of thermoacoustic cooling." International Journal of Heat and Mass Transfer 53, no. 19-20 (September 2010): 3940–46. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.05.012.

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Di Benedetto, A., and E. Salzano. "CFD simulation of pressure piling." Journal of Loss Prevention in the Process Industries 23, no. 4 (July 2010): 498–506. http://dx.doi.org/10.1016/j.jlp.2010.03.003.

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Eitzlmayr, A., D. Suzzi, S. Radl, and J. G. Khinast. "CFD-Simulation eines Nanopartikel-Präzipitationsprozesses." Chemie Ingenieur Technik 82, no. 9 (August 27, 2010): 1309. http://dx.doi.org/10.1002/cite.201050377.

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Ottow, W., A. Kümmel, and J. Büchs. "Schüttelkolben: CFD-Simulation und Messung." Chemie Ingenieur Technik 76, no. 9 (September 2004): 1365. http://dx.doi.org/10.1002/cite.200490264.

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Fresia, Paola, and Massimo Rundo. "CFD Simulation of a Post-Compensated Load Sensing Directional Control Valve." E3S Web of Conferences 312 (2021): 05002. http://dx.doi.org/10.1051/e3sconf/202131205002.

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The paper presents the CFD model of a load sensing directional control valve. The model was validated experimentally in terms of pressure drop and flow force at different positions of the spool. The spool position was imposed manually by means of a micrometric screw and a load cell was used for measuring the flow force. The CFD model was developed with the CAD-embedded tool FloEFD®. The model has been proved to be very reliable in estimating the pressure drop, moreover quite good results were obtained also in the evaluation of the flow force. The CFD simulations were used to tune the coefficients of a lumped parameter model of the valve, so that such a model can be efficiently used for the simulation of an entire hydraulic circuit. Moreover, the CFD model has been used as design tool for attenuating the detrimental effect of the flow force. In particular, the width of the land upstream of the metering edge has an influence on the resultant force on the spool. If was found that it is possible to significantly reduce the flow force at maximum opening with a relatively small increment of the pressure drop across the valve.
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Gonzales, Howell B., John Tatarko, Mark E. Casada, Ronaldo G. Maghirang, Lawrence J. Hagen, and Charles J. Barden. "Computational Fluid Dynamics Simulation of Airflow through Standing Vegetation." Transactions of the ASABE 62, no. 6 (2019): 1713–22. http://dx.doi.org/10.13031/trans.13449.

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Abstract. Maintaining vegetative cover on the soil surface is the most widely used method for control of soil loss by wind erosion. We numerically modeled airflow through artificial standing vegetation (i.e., simulated wheat plants) using computational fluid dynamics (CFD). A solver (simpleFoam within the OpenFOAM software architecture) was used to simulate airflow through various three-dimensional (3D) canopy structures in a wind tunnel, which were created using another open-source CAD geometry software (Salomé ver. 7.2). This study focused on two specific objectives: (1) model airflow through standing vegetation using CFD, and (2) compare the results of a previous wind tunnel study with various artificial vegetation configurations to the results of the CFD model. Wind speeds measured in the wind tunnel experiment differed slightly from the numerical simulation using CFD, especially near positions where simulated vegetation was present. Effective drag coefficients computed using wind profiles did not differ significantly (p <0.05) between the experimental and simulated results. Results of this study will provide information for research into other types of simulated stubble or sparse vegetation during wind erosion events.HighlightsMeasured airflow through a simulated canopy was successfully modeled using CFD software.Effective drag coefficients did not differ between the experimental and simulated results.Results of this study provide 3-D simulation data of wind flow through a plant canopy. Keywords: 3-D canopy structure, OpenFOAM, Wind erosion, Wind tunnel studies.
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Branco Jr, A. M. C., A. L. A. Mesquita, and J. R. P. Vaz. "APPLICATION OF THE LINEAR SPRING-DASHPOT MODEL IN THE CFD-DEM SIMULATION OF ALUMINA FLUIDIZATION." Revista de Engenharia Térmica 14, no. 2 (December 31, 2015): 95. http://dx.doi.org/10.5380/reterm.v14i2.62141.

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The coupling of the Computational Fluid Dynamics (CFD) to the Discrete Element Method (DEM) to simulate fluidization is computationally demanding. Although the Linear Spring-Dahspot (LSD) model can help to reduce the CFD-DEM simulation runtime due to its simplicity, its applicability is not reasonable for all sorts of problems. The objective of the present work is to show the application of the LSD model to the CFD-DEM simulation of alumina fluidization. The simulations were carried out with the software ANSYS FLUENT 14.5 and divided into two parts: (1) the reproduction with ANSYS FLUENT of simulations from the literature in which the LSD model and a representative particle approach were used. (2) the simulation of alumina fluidization and validation with experimental data. The results of three main sets of parameters were analysed to include different DEM and CFD time steps, drag models, the representation of particles with both uniform size and particle size distribution, etc. The main conclusion of this work is that the LSD model and the CFD-DEM approach can be used to model the actual behaviour of alumina fluidized beds, but the high simulation runtime and the correct setting of the strategies used to control it are still limiting factors which deserve special attention.
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Shin, D. Y., C. H. Song, and Y. C. Lee. "Trend in CFD Technology and CFD Case Simulation on Drilling." Journal of The Korean Society for Fluid Power & Construction Equipments 9, no. 1 (March 1, 2012): 26–30. http://dx.doi.org/10.7839/ksfc.2012.9.1.026.

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Senfter, Thomas, Manuel Berger, Markus Schweiberer, Serafin Knitel, and Martin Pillei. "An Experimentally Validated CFD Code to Design Coandă Effect Screen Structures." Applied Sciences 13, no. 9 (May 7, 2023): 5762. http://dx.doi.org/10.3390/app13095762.

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Coandă effect screen structures are used to protect hydropower turbines in mountainous regions from impurities of different sizes. To save time during the design phase, computational fluid dynamics simulations (CFD) can support experimental investigations. Experimental investigations and 2D CFD simulations are performed on the base of the Coandă effect screen structure. Flow rates of 7 m3/h, 8 m3/h, and 9 m3/h are simulated, captured by a camera system in the experiments, and compared. In the experimental setting, the fill level of the Coandă rake is measured. For comparison, the RMSE of the y-position fill level is computed between simulation and measurement. Furthermore, the mass flow balance, Π, is evaluated. The RMSE of the y-direction fill level between simulation and measurement is on average 2.1 mm and 4.4 mm for the lower CFD level and the higher CFD level, respectively. Experiments show an average 6.72% higher Π. The reason for this is that 2D CFD does not consider the surface tension of the borders. In the diverted flow region, the flow field based on experiments appears less viscous than in the simulations. CFD simulations are an appropriate tool to support the design process of Coandă effect screens, especially for fill level determination. The validated CFD code can reduce the cost and time of experiments to design future Coandă effect screen structures.
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Lee, Jongwon, Sung Hee Lee, Sang Jin Park, Seong Bum Kim, Taeyeon Kim, Chunghyup Mok, Jae Yoon Jeong, Heesoo Seok, and Kang-Duck Ih. "Wind noise performance prediction based on deep learning approach with vehicle exterior snapshot images." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 266, no. 2 (May 25, 2023): 152–62. http://dx.doi.org/10.3397/nc_2023_0022.

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Wind noise is one of the most important factor in vehicle development, and it is significantly influenced by the exterior design. The exterior design is changed many times throughout the development process, therefore it's very inefficient to make prototypes or to perform CFD simulations. Our CFD simulation accuracy has been improved over many years through validation studies and it's now the most trustful source however it has limitation on a long simulation time. In this research, a method to efficiently create a training data set to develop a CNN Deep learning model based on exterior images is proposed. First, CFD simulation has been performed several times with changing wind noise influence factors, and a meta-model is created based on these initial simulations. This meta-model creates various vehicle shapes, and calculates wind noise simulation results. After that, CNN DL model is created based on the images that has been created by the meta-model which best express the wind noise influence factor. This model promptly predicts the wind noise performances and verified through CFD simulation. Through this research, we were able to predict wind noise only with images, hence validated the possibility of general use that can be applied to various vehicles.
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Bartoldson, Brian, Rui Wang, Yucheng Fu, David Widemann, Sam Nguyen, Jie Bao, Zhijie Xu, and Brenda Ng. "Latent Space Simulation for Carbon Capture Design Optimization." Proceedings of the AAAI Conference on Artificial Intelligence 36, no. 11 (June 28, 2022): 12447–53. http://dx.doi.org/10.1609/aaai.v36i11.21511.

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The CO2 capture efficiency in solvent-based carbon capture systems (CCSs) critically depends on the gas-solvent interfacial area (IA), making maximization of IA a foundational challenge in CCS design. While the IA associated with a particular CCS design can be estimated via a computational fluid dynamics (CFD) simulation, using CFD to derive the IAs associated with numerous CCS designs is prohibitively costly. Fortunately, previous works such as Deep Fluids (DF) (Kim et al., 2019) show that large simulation speedups are achievable by replacing CFD simulators with neural network (NN) surrogates that faithfully mimic the CFD simulation process. This raises the possibility of a fast, accurate replacement for a CFD simulator and therefore efficient approximation of the IAs required by CCS design optimization. Thus, here, we build on the DF approach to develop surrogates that can successfully be applied to our complex carbon-capture CFD simulations. Our optimized DF-style surrogates produce large speedups (4000x) while obtaining IA relative errors as low as 4% on unseen CCS configurations that lie within the range of training configurations. This hints at the promise of NN surrogates for our CCS design optimization problem. Nonetheless, DF has inherent limitations with respect to CCS design (e.g., limited transferability of trained models to new CCS packings). We conclude with ideas to address these challenges.
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Hodapp, Maximilian J., Jhon J. Ramirez-Behainne, Milton Mori, and Leonardo Goldstein. "Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed." International Journal of Chemical Engineering 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/786982.

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The hydrodynamics of circulating fluidized beds (CFBs) is a complex phenomenon that can drastically vary depending on operational setup and geometrical configuration. A research of the literature shows that studies for the prediction of key variables in CFB systems operating at high temperature still need to be implemented aiming at applications in energy conversion, such as combustion, gasification, or fast pyrolysis of solid fuels. In this work the computational fluid dynamics (CFD) technique was used for modeling and simulation of the hydrodynamics of a preheating gas-solid flow in a cylindrical bed section. For the CFD simulations, the two-fluid approach was used to represent the gas-solid flow with the k-epsilon turbulence model being applied for the gas phase and the kinetic theory of granular flow (KTGF) for the properties of the dispersed phase. The information obtained from a semiempirical model was used to implement the initial condition of the simulation. The CFD results were in accordance with experimental data obtained from a bench-scale CFB system and from predictions of the semiempirical model. The initial condition applied in this work was shown to be a viable alternative to a more common constant solid mass flux boundary condition.
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Li, Lei, Yongsheng Ma, and Carlos F. Lange. "Association of Design and Simulation Intent in CAD/CFD Integration." Procedia CIRP 56 (2016): 1–6. http://dx.doi.org/10.1016/j.procir.2016.10.006.

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Li, Mengxi, Xinfa Qiu, Juanjun Shen, Jinqin Xu, Bo Feng, Yongjian He, Guoping Shi, and Xiaochen Zhu. "CFD Simulation of the Wind Field in Jinjiang City Using a Building Data Generalization Method." Atmosphere 10, no. 6 (June 16, 2019): 326. http://dx.doi.org/10.3390/atmos10060326.

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The urban wind environment is an important element of urban microclimates and plays an important role in the quality of the urban environment. The computational fluid dynamics (CFD) simulation method is an important means for urban wind field research. However, CFD simulation has high requirements for computer hardware and software. In this paper, based on geographic information system (GIS) technology, a new building data generalization method was developed to solve the problems of a huge amount of data and calculations in urban-scale CFD wind field simulations. Using Fluent software and high-precision urban building geographic information data with elevation attributes, the method was applied to Jinjiang City, Fujian Province, China. A CFD simulation of the wind field of Jinjiang City was implemented, and detailed, intuitive wind field information was obtained, which were compared with the measured data. The results show that the building data generalization method could effectively improve the efficiency of the city's overall wind field CFD simulation. The simulated wind speed was significantly correlated with the measured data, but it was overestimated. The simulated wind direction was consistent with the measured data of most stations. The simulation results were reasonable and could provide reference for application and subsequent research.
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Oruc, Ilker, Joseph F. Horn, Jeremy Shipman, and Susan Polsky. "Towards real-time pilot-in-the-loop CFD simulations of helicopter/ship dynamic interface." International Journal of Modeling, Simulation, and Scientific Computing 08, no. 04 (December 2017): 1743005. http://dx.doi.org/10.1142/s179396231743005x.

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This study presents the development of computationally efficient coupling of Navier–Stokes Computational Fluid Dynamics (CFD) with a helicopter flight dynamics model with the ultimate goal of real-time simulation of airwake effects in the helicopter/ship Dynamic Interface (DI). The flight dynamics model is free to move within a computational domain, where the main rotor forces are converted to source terms in the momentum equations of the CFD solution using an actuator disk model. Simultaneously, the CFD solver calculates induced velocities that are fed back to the simulation and affect the aerodynamic loads in the flight dynamics. The CFD solver models the inflow, ground effect and interactional aerodynamics in the flight dynamics simulation, and these calculations can be coupled with the solution of the external flow (e.g., ship airwake effects). The simulation framework for fully-coupled pilot-in-the-loop (PIL) flight dynamics/CFD is demonstrated for a simplified shedding wake. Initial tests were performed with 0.38 million structured grid cells running on 352 processors and showed near-real-time performance. Improvements to the coupling interface are described that allow the simulation run at near-real-time execution speeds on currently available computing platforms. Improvements in computing hardware are expected to allow real-time simulations.
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Pradana, Sabilly Handi, and Deni Shidqi Khaerudini. "CFD SIMULATION FOR AIRSPEED AND TURBULENCE VALIDATION IN MAIN DUCTING OF OFFICE BUILDING." International Journal of Innovation in Mechanical Engineering and Advanced Materials 4, no. 1 (August 12, 2022): 1. http://dx.doi.org/10.22441/ijimeam.v4i1.12050.

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This paper focuses on the calculation of sizing ducting based on cooling load requirements the main ducting of office building following regulation airspeed requirements using American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) and Computational Fluid Dynamics (CFD) simulations. The purpose of this research is to validate the airspeed and turbulence that occurs in the main ducting between manual calculations and CFD simulations. From the calculation, the cooling load requirement is 58.22 kW, for the cooling process an air flowrate of 7117 L/s is needed which is designed to pass through the main ducting in rectangular shape. The main ducting size uses 1200 mm x 500 mm at a speed of 12.7 m/s according to ASHRAE. Autodesk Inventor software is used for ducting modeling and Autodesk CFD is used for airflow simulation. CFD simulations are performed by applying boundary conditions and input parameters. The results showed that the velocity of the ducting design was suitable at 12.7 m/s with laminar flow. The ducting geometry must be designed aerodynamically to reduce the pressure drop which can cause the speed to increase so that it is outside the required limits. Thus, the CFD simulation results have verified the validity of manual calculations.
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Shi, Xueqing, Daniel (Jian) Sun, Ying Zhang, Jing Xiong, and Zhonghua Zhao. "Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation." International Journal of Environmental Research and Public Health 17, no. 12 (June 24, 2020): 4557. http://dx.doi.org/10.3390/ijerph17124557.

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Transportation has become one of the primary sources of urban atmospheric pollutants and it causes severe diseases among city residents. This study focuses on assessing the pollutant dispersion pattern using computational fluid dynamics (CFD) numerical simulation, with the effect and results validated by the results from wind tunnel experiments. First, the wind tunnel experiment was carefully designed to preliminarily assess the flow pattern of vehicle emissions. Next, the spatiotemporal distribution of pollutant concentrations around the motor vehicle was modeled using a CFD numerical simulation. The pollutant concentration contours indicated that the diffusion process of carbon monoxide mainly occurred in the range of 0−2 m above the ground. Meanwhile, to verify the correctness of the CFD simulation, pressure distributions of seven selected points that were perpendicular along the midline of the vehicle surface were obtained from both the wind tunnel experiment and the CFD numerical simulation. The Pearson correlation coefficient between the numerical simulation and the wind tunnel measurement was 0.98, indicating a strong positive correlation. Therefore, the distribution trend of all pressure coefficients in the numerical simulation was considered to be consistent with those from the measurements. The findings of this study could shed light on the concentration distribution of platoon-based vehicles and the future application of CFD simulations to estimate the concentration of pollutants along urban street canyons.
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Mørch, H., M. Perić, J. Röper, and E. Schreck. "CFD-Supported Design of Lifeboats." NAFEMS International Journal of CFD Case Studies 10 (March 2013): 31–42. http://dx.doi.org/10.59972/ffm3fczg.

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Lifeboats are important for the safety of crew on oil platforms and marine vessels. Their design has so far been mostly based on experimental studies. However, the large number of factors which influence the loads on the lifeboat structure and its occupants makes optimization studies by experimental means both time-consuming and expensive. Besides, many effects cannot be studied at laboratory scale due to the inability to match all similarity parameters, and certain conditions cannot be realized in a laboratory. Numerical simulations based on modern computational fluid dynamics (CFD) methods could complement experimental studies if proven to be sufficiently accurate and efficient. The aim of this study is to demonstrate that this indeed is the case: comparisons between experimental data and simulation results performed by the authors so far indicate that the achieved accuracy in numerical simulations is comparable to the accuracy of experiments. It is also shown that a simulation of one drop test can be performed with sufficient accuracy in one day on a single core of a personal computer. Together with a computational method which uses overlapping grids to simplify the handling of lifeboat motion and specification of initial and boundary conditions, parametric studies of lifeboat water entry have thus become practicable.
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Valencia, Alvaro, Patricio Burdiles, Miguel Ignat, Jorge Mura, Eduardo Bravo, Rodrigo Rivera, and Juan Sordo. "Fluid Structural Analysis of Human Cerebral Aneurysm Using Their Own Wall Mechanical Properties." Computational and Mathematical Methods in Medicine 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/293128.

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Computational Structural Dynamics (CSD) simulations, Computational Fluid Dynamics (CFD) simulation, and Fluid Structure Interaction (FSI) simulations were carried out in an anatomically realistic model of a saccular cerebral aneurysm with the objective of quantifying the effects of type of simulation on principal fluid and solid mechanics results. Eight CSD simulations, one CFD simulation, and four FSI simulations were made. The results allowed the study of the influence of the type of material elements in the solid, the aneurism’s wall thickness, and the type of simulation on the modeling of a human cerebral aneurysm. The simulations use their own wall mechanical properties of the aneurysm. The more complex simulation was the FSI simulation completely coupled with hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness. The FSI simulation coupled in one direction using hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness is the one that presents the most similar results with respect to the more complex FSI simulation, requiring one-fourth of the calculation time.
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44

Shaikh, J. "A Methodology for Industrial CFD." NAFEMS International Journal of CFD Case Studies 4 (January 2004): 15–25. http://dx.doi.org/10.59972/grz5jq8h.

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The central tenet of this paper is that there is no fixed level of credibility or accuracy that is applicable to all CFD simulations. The required level of accuracy is dependent on the industrial context for the work. This paper describes a framework suggested by the American Institute of Aeronautics and Astronautics [1] designed to aid the assessment of the credibility of CFD simulations. The framework distinguishes between Reality, the Conceptual Model of Reality and the Computational CFD model. The processes of Qualification, Verification and Validation are used to assess the levels of Error and Uncertainty within the simulation system. The methodology presented is not exhaustive and is intended to act as a guideline for the assessment of Industrial CFD simulations.
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Hohne, Thomas. "ICONE15-10259 CFD-SIMULATION OF THERMAL HYDRAULIC BENCHMARK V1000CT-2 USING ANSYS CFX." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_128.

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46

Matej, Kurilla, Knížat Branislav, and Olšiak Róbert. "Approach to 3D Unsteady CFD Analysis of a Single-Blade Pump." MATEC Web of Conferences 328 (2020): 02016. http://dx.doi.org/10.1051/matecconf/202032802016.

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Single-blade centrifugal pumps are hydraulic machines used in many industrial areas. A unique screw shaped blade enables liquids containing solids and fibrous matters to be pumped. Owing to good pump hydraulic properties on the one hand and unfavourable impeller mechanical properties on the other have single-blade pumps become recently more interesting for researchers regarding the CFD simulations. In this case a conventional CFD approach for multi-blade pumps cannot be applied due to the lack of symmetry of the single-blade impeller. Possible approaches to the CFD simulation of a single-blade impeller in the Ansys Fluent and the Ansys CFX are compared in this paper. A comparison of two CFD meshing tools showed substantial element number decrease of the whole CFD model. This paper presents also the laboratory experiment results of the investigated single-blade pump. The paper describes a new approach to the single-blade CFD simulation through Ansys Fluent which is faster and more user-friendly then the conventional approach.
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Schöck, J., F. Muggli, and S. Hirschberg. "Simulation of the Efficiency of Static Mixers." NAFEMS International Journal of CFD Case Studies 9 (March 2011): 43–50. http://dx.doi.org/10.59972/7gwrrmm7.

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Within the Sulzer Corporation the behavior and efficiency of static mixers is predicted by means of CFD. Typical mixers are the SMX mixer and the CompaX mixer. As the SMX mixer is used for laminar mixing and homogenization of high viscous fluids, the CompaX mixer is applied for turbulent flow regimes. Simulations carried out for these mixers have been validated with measurements. Key values to evaluate the efficiency are the pressure loss and mixing quality. The pressure loss for both mixer types can be directly gained from the CFD simulation. But it is not possible to predict the mixing quality of laminar mixers directly from CFD simulations as for laminar flows the numerical diffusion is significantly higher than the real molecular diffusion. Thus, to predict the mixing quality of laminar mixers a trajectory method is applied. The molecular diffusion along the trajectories is taken into consideration by a Monte Carlo method. For turbulent flows diffusive mass transfer plays only a minor role. Therefore, the mixing quality can be gained directly from the CFD simulation. Furthermore, for structural analysis the forces acting on the mixer elements induced by the flow, the residence time distribution of fluid elements in the mixer and heat exchange with the duct wall is of particular interest.
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Ha, Yoon-Jin, Ji-Yong Park, and Seung-Ho Shin. "Numerical Study of Non-Linear Dynamic Behavior of an Asymmetric Rotor for Wave Energy Converter in Regular Waves." Processes 9, no. 8 (August 23, 2021): 1477. http://dx.doi.org/10.3390/pr9081477.

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This study conducted a numerical investigation on the non-linear motion problems between a Salter duck-type rotor and large waves using CFD simulations. Regular waves of five different wave heights were generated. First, the linear motion of the rotor from the CFD simulation was verified by comparing it with the existing experimental and frequency domain analysis results. Then, a series of CFD simulations were performed to investigate the non-linear motions of the rotor. In the case of a lower wave height, the CFD simulation results were in good agreement with the experimental and frequency domain analysis results. However, as the wave height increased, the resonance periods were different in each other. In addition, the magnitudes of normalized pitch motions by the wave heights decreased as the wave heights increased. To investigate the aforementioned phenomena, the pitch motion equation was examined using separate CFD simulations. The results showed that changing the restoring moments induced changes in the maximum pitch motions and magnitudes of the normalized pitch motions. In the case of a higher wave height, non-linear phenomena and the changing restoring moments induced non-linear motion.
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Wichangarm, Mana, Anirut Matthujak, Thanarath Sriveerakul, Sedthawatt Sucharitpwatskul, and Sutthisak Phongthanapanich. "Simulation Study of LPG Cooking Burner." International Journal of Engineering & Technology 7, no. 3.7 (July 4, 2018): 142. http://dx.doi.org/10.14419/ijet.v7i3.7.16257.

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The objective of this paper is to numerically study the flow feature and combustion phenomena of an energy-saving cooking burner using three-dimensional computational fluid dynamics (CFD). Combustion temperatures were experimentally and numerically investigated in order to not only validate the CFD model, but also describe the combustion phenomena. From the temperature comparison, the CFD model was good agreement with the experiment, having the error of less than 5.86%. Based upon the insight from the CFD model, the high temperature of 1,286 K occurred at the middle of the burner. The high intensive vortex of the flow being enhanced the combustion intensity and the heat transfer coefficient is obvious observed near the burner head inside the ring. Therefore, it is concluded that the burner ring is the major part since it controls flame structure, high temperature region, intensive combustion region, heat loss and suitable flow feature. However, heat transfer to the vessel should be further clarified by the CFD model.
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Rzehak, Roland, and Eckhard Krepper. "CFD simulation of DEBORA boiling experiments." Archives of Thermodynamics 33, no. 1 (August 1, 2012): 107–22. http://dx.doi.org/10.2478/v10173-012-0005-0.

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CFD simulation of DEBORA boiling experimentsIn this work we investigate the present capabilities of computational fluid dynamics for wall boiling. The computational model used combines the Euler/Euler two-phase flow description with heat flux partitioning. This kind of modeling was previously applied to boiling water under high pressure conditions relevant to nuclear power systems. Similar conditions in terms of the relevant non-dimensional numbers have been realized in the DEBORA tests using dichlorodifluoromethane (R12) as the working fluid. This facilitated measurements of radial profiles for gas volume fraction, gas velocity, bubble size and liquid temperature as well as axial profiles of wall temperature. After reviewing the theoretical and experimental basis of correlations used in the ANSYS CFX model used for the calculations, we give a careful assessment of the necessary recalibrations to describe the DEBORA tests. The basic CFX model is validated by a detailed comparison to the experimental data for two selected test cases. Simulations with a single set of calibrated parameters are found to give reasonable quantitative agreement with the data for several tests within a certain range of conditions and reproduce the observed tendencies correctly. Several model refinements are then presented each of which is designed to improve one of the remaining deviations between simulation and measurements. Specifically we consider a homogeneous MUSIG model for the bubble size, modified bubble forces, a wall function for turbulent boiling flow and a partial slip boundary condition for the liquid phase. Finally, needs for further model developments are identified and promising directions discussed.
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