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Keywords: high speed train, Fluent, turbulent models, Strouhal number.

Summary

In this paper the aerodynamics of a high-speed train has been studied with computational dynamics simulations. Three turbulent models have been compared: k-epsilon (realizable), k-omega (SST) and detached eddy simulation (DES with kepsilon realizable). The train used is the TVG duplex at 300 km/h, and it has been discretized with a structured grid with a y+ between 30 and 300. Different time steps have been employed. The software used for this purpose has been Ansys Fluent on a cluster of Intel ® Xeon ® Quad -Core E5530 2.4 GHz processors. The aim of this research is to quantify the influence of the unsteady phenomena and to analyse the effect of the turbulent model used on the size of the generated vortexes, the final drag coefficient and other characteristic aerodynamic parameters. Moreover, the stability, convergence level, and accuracy of each model have been compared. The results show differences in the behaviour of the turbulent models used, and the influence of the unsteady. The results obtained agree with previous general conclusions about the versatility and range of application of the k-epsilon and komega models and the higher capacity of DES model to capture details associated with detachment processes and the wake.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 105 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: Paper 7 Comparison of Turbulent Models applied to the Aerodynamics of a High Speed Train C. Paz, C. Gil, E. Suárez and J. Porteiro Industrial Engineering School, University of Vigo, Spain doi:10.4203/ccp.105.7 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Comparison of Turbulent Models applied to the Aerodynamics of a High Speed Train", in , (Editors), "Proceedings of the Ninth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 7, 2014. doi:10.4203/ccp.105.7 Keywords: high speed train, Fluent, turbulent models, Strouhal number. Summary In this paper the aerodynamics of a high-speed train has been studied with computational dynamics simulations. Three turbulent models have been compared: k-epsilon (realizable), k-omega (SST) and detached eddy simulation (DES with kepsilon realizable). The train used is the TVG duplex at 300 km/h, and it has been discretized with a structured grid with a y+ between 30 and 300. Different time steps have been employed. The software used for this purpose has been Ansys Fluent on a cluster of Intel ® Xeon ® Quad -Core E5530 2.4 GHz processors. The aim of this research is to quantify the influence of the unsteady phenomena and to analyse the effect of the turbulent model used on the size of the generated vortexes, the final drag coefficient and other characteristic aerodynamic parameters. Moreover, the stability, convergence level, and accuracy of each model have been compared. The results show differences in the behaviour of the turbulent models used, and the influence of the unsteady. The results obtained agree with previous general conclusions about the versatility and range of application of the k-epsilon and komega models and the higher capacity of DES model to capture details associated with detachment processes and the wake. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £45 +P&P)
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