The paper presents RANS based three-dimensional simulations of a generic highspeed train comprising two and half cars, including the end car, using a mesh of 35 million polyhedral cells and Star-CCM+. The results show a very complex flow structure inside the inter car gap (ICG) with a distorted swirling fluid motion and the presence of strong secondary flows forming cellular structures. The drag for each ICG accounts for 4% of the two and half car total drag. The influence of offset between two cars was assessed by introducing a displacement of the coach car of 20 mm that increases the ICG drag by 32 %, relatively to the reference case. The presence of a small cross-wind component of 2 m/s was not enough to separate the train boundary layer, with an increase of CD less than 1 %. When the ICG is exposed to a cross-wind component and a geometry offset, the effects add up and the CD increases to 35 %, relative to the reference case.
Numerical investigations on the inter-car-gap flow for a generic high speed train
2012
12 Seiten, 9 Bilder, 1 Tabelle, 8 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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