期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 132, 期 5, 页码 3190-3199出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4757747
关键词
-
资金
- 973 Program [2012CB720200]
- NSFC [51076006, 50736007, 50890181]
An immersed boundary computational model is presented in order to deal with the acoustic scattering problem by complex geometries, in which the wall boundary condition is treated as a direct body force determined by satisfying the non-penetrating boundary condition. Two distinct discretized grids are used to discrete the fluid domain and immersed boundary, respectively. The immersed boundaries are represented by Lagrangian points and the direct body force determined on these points is applied on the neighboring Eulerian points. The coupling between the Lagrangian points and Euler points is linked by a discrete delta function. The linearized Euler equations are spatially discretized with a fourth-order dispersion-relation-preserving scheme and temporal integrated with a low-dissipation and low-dispersion Runge-Kutta scheme. A perfectly matched layer technique is applied to absorb out-going waves and in-going waves in the immersed bodies. Several benchmark problems for computational aeroacoustic solvers are performed to validate the present method. (C) 2012 Acoustical Society of America. [http://dx.doi.org/10.1121/1.4757747]
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