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J. García¹, J. Muñoz¹, A. Jiménez², E. Migoya¹ and A. Crespo¹

¹Industrial Applied Fluid Mechanics Research Group, Department of Energy and Fluid Mechanics Engineering, Polytechnic University of Madrid, Spain
²Thermodynamics Research Group, Department of Energy and Fluid Mechanics Engineering, Polytechnic University of Madrid, Spain

doi:10.4203/ccp.104.33

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, "Numerical Simulation of the Aerodynamic Behavior of High Velocity Trains under Synthetic Crosswinds of Different Shear and Turbulence Characteristics", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 33, 2014. doi:10.4203/ccp.104.33

Keywords: train aerodynamics, cross wind, atmospheric turbulence.

Summary

A numerical simulation of the aerodynamic behavior of high-speed trains under synthetic crosswinds at a 90° yaw angle is presented. The train geometry is the aerodynamic train model (ATM). Flow description based on numerical simulations is obtained using large eddy simulation (LES) and the commercial code ANSYS-Fluent V14.5. A crosswind whose averaged velocity and turbulence characteristics change with distance to the ground is imposed. Turbulent fluctuations that vary temporally and spatially are simulated with TurbSim code. The crosswind boundary condition is calculated for the distance the train runs during a simulation period. The inlet streamwise velocity boundary condition is generated using Taylor's frozen turbulence hypothesis. The model gives a time history of the force and moments acting on the train; this includes averaged values, standard deviations and extreme values. Of particular interest are the spectra of the forces and moments, and the admittance spectra. For comparison, results obtained with LES and a uniform wind velocity fluctuating in time, and results obtained with Reynolds averaged Navier Stokes equations (RANS), and the averaged wind conditions, are also presented.

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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: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 33 Numerical Simulation of the Aerodynamic Behavior of High Velocity Trains under Synthetic Crosswinds of Different Shear and Turbulence Characteristics J. García¹, J. Muñoz¹, A. Jiménez², E. Migoya¹ and A. Crespo¹ ¹Industrial Applied Fluid Mechanics Research Group, Department of Energy and Fluid Mechanics Engineering, Polytechnic University of Madrid, Spain ²Thermodynamics Research Group, Department of Energy and Fluid Mechanics Engineering, Polytechnic University of Madrid, Spain doi:10.4203/ccp.104.33 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Numerical Simulation of the Aerodynamic Behavior of High Velocity Trains under Synthetic Crosswinds of Different Shear and Turbulence Characteristics", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 33, 2014. doi:10.4203/ccp.104.33 Keywords: train aerodynamics, cross wind, atmospheric turbulence. Summary A numerical simulation of the aerodynamic behavior of high-speed trains under synthetic crosswinds at a 90° yaw angle is presented. The train geometry is the aerodynamic train model (ATM). Flow description based on numerical simulations is obtained using large eddy simulation (LES) and the commercial code ANSYS-Fluent V14.5. A crosswind whose averaged velocity and turbulence characteristics change with distance to the ground is imposed. Turbulent fluctuations that vary temporally and spatially are simulated with TurbSim code. The crosswind boundary condition is calculated for the distance the train runs during a simulation period. The inlet streamwise velocity boundary condition is generated using Taylor's frozen turbulence hypothesis. The model gives a time history of the force and moments acting on the train; this includes averaged values, standard deviations and extreme values. Of particular interest are the spectra of the forces and moments, and the admittance spectra. For comparison, results obtained with LES and a uniform wind velocity fluctuating in time, and results obtained with Reynolds averaged Navier Stokes equations (RANS), and the averaged wind conditions, are also presented. 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 £65 +P&P)
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