Operating speed of high-speed trains is increasing all the time with recent record off almost 600 [km/h]. In the same time more countries than ever are developing high-speed trains operating at speeds of 250 [km/h] and above. Such operating speeds are producing aerodynamic conditions of trains that are not sufficiently explored. Examples of aerodynamic-related problems which become larger at these speeds are aerodynamically generated noise, upraise of ballast, slipstreams and crosswind stability. The present paper deals with the latter one and in particular with the flow conditions during the train's passage through wind gusts. Detached eddy simulation of flow around a highspeed train exiting a tunnel and passing through a region of varying crosswind is presented. Results using two crosswind profiles with different velocity amplitudes during and after the trains passage are compared. The flow surrounding the train after the passage through the varying crosswind velocity profile was found to return to a flow similar to that before the exit from the tunnel in case when the final crosswind velocity is zero. Thus the flow seems to forget the passage through the wind gust.
DES of the flow around a high-speed train under the influence of wind gusts
2008
6 Seiten, 12 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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