Application of Numerical Simulation Technology to Prediction of Aerodynamic Dipole Acoustics Source on Automobile Surface

Abstract

According to the Lighthill-Curle sound analogy theory, the aerodynamic noise source arising from automobile in moving mainly comes from the surface dipole source which is determined by the turbulence pressure fluctuation near the vehicle surface, and its strength & distribution determine the external aerodynamic acoustic field around the automobile. This paper focuses on the prediction of aerodynamic dipole acoustics source distribution on automobile surface with the help of CFD technology combined with BEM method. Then the external acoustic field outside the automobile could be simulated based on aerodynamic dipole acoustics source.