流声分解法及完美匹配层在气动噪声模拟中的应用研究OA北大核心

Aiming to address the need for high-precision reflection-free boundaries in the treatment of unbounded regions,this paper converts the acoustic perturbation variables of the viscous/acoustic splitting decomposition method to the frequency domain using Fourier transforms and introduces absorption coefficients,which leads to equations in the frequency domain.The inverse Fourier transform is then performed to convert to the control equa-tions of the viscous/acoustic splitting decomposition method with a perfect matching layer.These equations are discretized using the lattice-centered finite volume method within the OpenFOAM open-source software platform.This method effectively simulates the propagation of acoustic fields and eliminates boundary reflections.Several classical noise examples,including plane wave propagation,cylindrical wave propagation,four-level sub-noise propagation,and pulsating spherical source sound propagation,were calculated.The results show that the vis-cous/acoustic splitting decomposition method with a perfectly matched layer effectively absorbs all outgoing waves in the transition region.Numerical simulation results for acoustic problems are in good agreement with theoretical solutions.The proposed method effectively reduces the boundary reflections compared to methods with character-ized non-reflecting boundaries.