This paper presents a large eddy simulation method based on ful y unstructured finite volume method, and unsteady aerodynamic response of a high-speed train vehicle subjected to transient crosswind was investigated. First, the method was validated for train model in three static aerodynamic conditions with different crosswinds;showing good agreement of aerodynamic forces and moments with wind-tunnel data, as provided in EN-14067-6. Then, the method was applied to transient crosswind situation: a sinusoidal perturbation gust representing a gradually varying crosswind yaw angle, in range typical with real trains. Typical transient responses of aerodynamic forces and moments such as increase with yaw angles, phase responses were observed, and their dependence on shape and amplitude of wind perturbation was discussed. Consequentially, application and validity of large eddy simulation was illustrated with reference to train vehicles, esp. as this detailed aerodynamic force results are difficult to be obtained from conventional wind tunnels.
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