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Descripción
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| This work presents the comparison of results obtained numerically and experimentally for a reference high speed train of CAF exposed to cross winds. Two different scenarios are studied: first, a flat ground scenario and second, the configuration of ballast and rails proposed by the current TSI HS RST and the prEN 14067-6:2007. The purpose is to study the behavior of the train against cross winds and to investigate the accuracy that typical steady state CFD-RANS methods produce by comparison with experimental results. The experimental data are obtained in a wind tunnel with a 1:15 scaled model. Yaw angles between 0º and 70º, in steps of 5º are considered. Besides, in the case of ballast and rail configuration, both windward and leeward cases are included. The model consists of a first car and a dummy end-car. The results for a Reynolds number equal to 7.6×105 are presented. A sensitivity analysis of the results to the RANS models and discretization scheme is presented. It is found that the best agreement with the experiments corresponds to the k-¿ realizable and third order discretization scheme. Numerical simulations have been carried out with the Fluent commercial code. In general, the numerical results show a good agreement with the experiments, although some discrepancies appear mainly for the higher yaw angles. Therefore, for the yaw angles of practical interest, the CFD analysis turns out to be a useful tool for predicting the aerodynamic response of the train. These results can be used to obtain the stability range of the train. | |
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Internacional
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Si |
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Entidad
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Euromech Colloquium 509. Vehicle Aerodynamics |
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Lugar
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Berlin (Alemania) |
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Tipo de publicación
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Proceedings |