ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A Unified Aeroacoustic Computational Integral Method of Noise Radiation and Scattering with Noncompact Bodies
Received date: 2013-01-11
Revised date: 2013-06-13
Online published: 2013-06-19
Supported by
National Natural Science Foundation of China (11002116);Basic Research Foundation of Northwestern Polytechnical University (GCKY1006)
In order to deal with the high requirement for computation resources of a high order method in the aeroacoustic numerical simulation, and also take into consideration the scattering effects from noncompact bodies, a unified aeroacoustic computational method of noise radiation and scattering is presented in this paper which combines the calculation of the scattering noise due to noncompact surfaces and the radiation noise induced by flow field variables. The pulsations of the flow field variables are divided into hydrodynamic components and acoustic components, and then an integral solution for scattering scattering noise and far field noise is obtained based on Lighthill acoustic analogy theory and the wave equation of Green's function. According to this method, numerical calculation is developed in two steps. The scattering pressure distribution is first obtained by solving the unified integral equation with the observation points located on the body surface, and then the far field pressure of arbitrary points is computed when the observation point is located in the far field. Verification work is developed in connection with the numerical calculation of two-dimensional and three-dimensional circular cylinders and a two-dimensional NACA0012 airfoil. The calculated aeroacoustic results agree well with experimental data and the numerical results of other methods. This shows that this unified integral method is able to calculate the scattering effect of noncompact bodies accurately while significantly reducing the computation load.
Key words： aeroacoustics; radiation; scattering; compressibility; noncompact body; integral equation
WANG Fang , LIU Qiuhong , CAI Jinsheng . A Unified Aeroacoustic Computational Integral Method of Noise Radiation and Scattering with Noncompact Bodies[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(11) : 2482 -2491 . DOI: 10.7527/S1000-6893.2013.0302
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