3. Key Laboratory of Aerodynamics Railway Industry,Central South University,Hunan,Changsha 410075,China;School of Traffic&Transportation Engineering,Central South University,Hunan,Changsha 410075,China
This paper uses the URANS numerical simulation method based on a 10-car EMU model,to investigate the impact of crosswind-induced bridge-tunnel transition on the aerodynamic characteristics of trains.Through analyzing surface pressure,aerodynamic forces,and flow field changes under varying speeds,the results show significant pressure differences between the windward and leeward sides of the train during the transition.As the train speed increases,pressure variations become more pronounced.Aerodynamic analysis reveals substantial fluctuations in drag,lateral force,and overturning moment in the bridge-tunnel transition area,especially lateral force,which exhibits sharp changes under crosswind conditions.Flow field analysis indicates strong vortex structures on the leeward side,significantly affecting the train's aerodynamic performance.These findings provide theoretical guidance for optimizing train aerodynamics in complex terrain.
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