Keywords: high-speed train, Fluent, technical specification for interoperability, aerodynamics, computational fluid dynamics, methodology.

In this paper, a methodology to evaluate the aerodynamic loads arising from the slipstream gusts of high-speed trains has been developed. This methodology is based on computational fluid dynamics (CFD) simulations, following the European technical specification for interoperability (TSI).

A simplified "Train à grande vitesse" (TGV) Duplex geometry has been used. Transient simulations were performed on the commercial software ANSYS Fluent, setting specific boundary conditions to reproduce the experimental tests. In the postprocessing, values of pressure and velocity at different heights and distances from the train centre line were presented and analysed following the directive criteria. It was easily recognised that the maximum peak velocity was not exceeded in any case and the pressure variation was lower than the allowed one, with the conclusion that the TGV model satisfies the normative requirements under open-air conditions, and also with a platform. The presented methodology was, therefore, proved as a flexible and useful tool to verify the fulfilment of the standards during the early stages of design of new trains, and even for validation purposes.

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