With computational fluid dynamics method, effect of embankment inclining angle on aerodynamic characteristics of high speed train under crosswinds is explored. It shows that as inclining angle of embankment is increased, side force coefficient on head train is increased a little and then decreased. Side force coefficient on middle train is gradually decreased. Side force coefficient on rear train is decreased a little and then increased as the angle reaches 47.5°. Negative lifting force coefficient on middle train is increased and lifting force coefficient on rear train is sensitive to inclining angle of embankment. The flow field around train is transformed as the inclining angle of embankment is changed and aerodynamic force or moment is changed consequently.

With computational fluid dynamics method, a numerical study on effect of viaduct noise barrier height on aerodynamic characteristics of a high speed train was made. High calculation precision is obtained with suitable meshing, appropriate turbulent model and boundary conditions. It shows that as moving in leeward the side force on head train or the middle train decreases gradually with increasing of noise barrier height. A rolling moment on the head is most and it fails as noise harrier height goes up. The roiling moment on middle train running in windward is greater than that in leeward as noise barrier height is increased. Under two running conditions, the train relative position in cavity flow is different and surface pressure distribution is changed. Accordingly, aerodynamic force or moment on train body is varied.