Abstract：In computational acoustic numerical simulation processes, when a high-order finite difference scheme is used to do spatial discretization, short wave divergence problems are easy to occur at places of grid discontinuity to contaminate numerical solutions in the whole computational domain. Here, aiming at this problem, based on the symmetric template DRP scheme, the artificial viscous distribution strategy was explored at discontinuous places of interface surface and singular points, etc., under a curvilinear coordinate system. Through contrastively calculating an initial acoustic disturbance propagating around a cylinder, the analysis results showed that sound wave gradually disperses in space over time; when sound wave reaches a cylinder, sound wave partially reflects to form a secondary sound source to spread sound wave into space again; computation divergence phenomena don’t happen in the whole computation process; so the proposed artificial viscous distribution strategy can effectively solve short wave divergence problems at discontinuous places, and provide a technical support for sound field simulations with complex configuration.
王鑫，余培汛，杨海，潘凯. 一种适用计算声学问题的网格间断人工粘性分布策略[J]. 振动与冲击, 2019, 38(11): 95-100.
WANG Xin， YU Peixun， YANG Hai， PAN Kai. An artificial viscous distribution strategy of grid discontinuity for computational aero-acoustic problems. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(11): 95-100.
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