A Method for Predicting the Aerodynamic Pass-By Noise Based on FW-H Equation Without Using Sliding Mesh or Overset Mesh

The classical FW-H equation is a common method to predict the far field aerodynamic noise, which has been integrated into many CFD software. However, when using CFD software to predict aerodynamic pass-by noise of the train, a sliding mesh or overset mesh has to be used to simulate the train motion, generating interfaces between the moving region and other stationary regions. The existence of such interfaces may have a negative effect on calculation accuracy. In this paper, a method based on the FW-H equation without using sliding mesh or overset mesh is proposed to predict sound generated at a fixed far-field point by an object moving uniformly in the space. In order to verify the effectiveness of this method, taking a stationary cylinder as an example, results of this method are compared with STAR-CCM+, and then the far-field pass-by noise of the cylinder moving at 50 m/s is calculated.