This paper describes the influence of yawing vibration of cars on the flow field around high-speed trains in tunnels. The flow field around a vehicle model, which is forcedly vibrated, is analyzed by a wind tunnel experiment. The result shows that a pressure field that has the same properties as those of real trains is found even though the train model is not vibrated. The effect of vibration on the flow field is small for vibration accelerations that are normally observed in real trains. Larger vibrations affect the aerodynamic force. the aerodynamic forces with and without vibration seem to be generated independently of each other.

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