A Meshless Model for Cavity Noise Prediction Based on Vortex Sound Method

Abstract

A meshless method for predicting cavity noise is developed by using the discrete vortex method and the vortex theory. Firstly, the discrete vortex sound method is used to calculate the flow field of the cavity under uniform grazing flow, and the key parameters such as the strength, position and velocity of the point vortices are obtained. Then, based on vortex sound theory, the sound pressure of point vortex in the free space is obtained, and the time-domain boundary element method is introduced to simulate the scattering effect of the cavity surface. In the end, the spectrum of the sound pressure is analysed. This meshless method has high computational efficiency, and can obtain the key characteristics of the flow field and sound field simultaneously. It can improve the basic understanding of the vortex sound mechanism of cavity noise. At the same time, it provides a reliable model method with satisfactory efficiency, which can be readily extended to the corresponding engineering applications.