基于高阶间断有限元法的气动噪声数值模拟

摘要

采用CFD+ CAA的混合方法对三维湍流激励的气动噪声进行了仿真计算.流场计算部分采用有限体积法求解RANS方程,得到定常的背景流场.在流场计算的基础上,基于SNGR(Stochastic Noise Generation and Radiation)方法构造声学控制方程LEE的右端源项,采用高阶间断有限元法(DG)求解线性欧拉方程(LEE)得到后视镜的非定常声场.适用于复杂外形的气动噪声仿真计算,是一种非常实用的气动噪声工程计算方法.%In this paper,a hybrid method combining Computational Fluid Dynamics (CFD) with Computational Aeroacoustics ( CAA) is used to simulate the flow - induced noise. The RANS equations are solved by the finite volume method to obtain the steady- state flow field. The source term of the LEE is generated by the SNGR ( Stochastic Noise Generation and Radiation) method based on the solution of flow. Subsequently, the High - order Discontinuous Galerkin Method ( DG) is used to solve the LEE to provide unsteady noise field.