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Large Eddy Simulations of a Typical European High-Speed Train Inside Tunnels
Technical Paper
2004-01-0229
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This article presents our results of external aerodynamics, obtained with Large Eddy Simulations (LES), about a typical European passenger-stock inside tunnels. The focal points are the aerodynamic forces and their typical frequencies applied to the tail. Two train lengths and three tunnels are employed in the study to model the conditions of double and single-track bores. Owing to the relatively high numerical cost associated with LES for external train aerodynamics we could only afford sufficient spatial grid resolution on our shortest train. The flow simulations confirm the existence of coherent structures alongside the body that give rise to continuously propagating pressure disturbances. These disturbances with a relatively small amplitude and high spatial frequency cannot affect the ride comfort. Still, they are found to influence the flow separation about the tail, which is regarded as one of the candidate mechanisms to impair the ride comfort and running stability.
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Authors
- Ben Diedrichs - Royal Institute of Technology (KTH), Dept. of Aeronautical and Vehicle Engineering, Div. Railway Technology
- Mats Berg - Royal Institute of Technology (KTH), Dept. of Aeronautical and Vehicle Engineering, Div. Railway Technology
- Siniša Krajnović - Chalmers, Dept of Thermo and Fluid Dynamics
Citation
Diedrichs, B., Berg, M., and Krajnović, S., "Large Eddy Simulations of a Typical European High-Speed Train Inside Tunnels," SAE Technical Paper 2004-01-0229, 2004, https://doi.org/10.4271/2004-01-0229.Also In
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