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Numerical study on multiple acoustic scattering by a vortex array
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DOI：10.1016/j.jsv.2022.116815.png)
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Abstract
En 中文
In this paper, the multiple scattering features of acoustic waves by a vortex array are studied by numerical simulation through solving the two-dimensional Euler equations in the time domain with high-order-accurate finite-difference methods. The computations of scattered fields with a very small amplitude are found to be in excellent agreement with a benchmark provided by previous studies. A more physical vortex array model as the base flow for the problem of the multiple acoustic scattering is proposed and validated numerically. The influences of the spatial scales on the scattered fields are investigated, and the significant scattering is observed in the regime where the spatial scales of acoustic waves and vortical fields are comparable. Compared with single scattering, multiple scattering involves the interferences of scattered waves induced by each vortex of the array and shows more complexities. The most valuable observation is that the zone of silencearises behind the vortex array. A significant noise reduction of 10 decibels is achieved by using the optimized vortex array.
Keywords:
Numerical simulation
Vortex array model
Interference field
Noise reduction
Journal
IF:
4.9
Papers:
1.7W
Citations:
4.8W
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