Abstract
Fluid dynamic simulation of wind noise (turbulent pressure fluctuations) around porous microphone windscreens in an atmospheric flow is made difficult by the broad range of spatial scales, from large atmospheric eddies down to the pore size of the windscreen, that is involved. Here, we describe a simplified simulation approach that is based on two new insights: (1) the ability of linear fluid flow approximations to describe wind noise [Z.C. Zheng and B. K. Tan, J. Acoust. Soc. Am. 113, 161–166 (2003)] and (2) a new set of macroscopic, time-domain relaxational equations for the linear interaction of a fluid flow with a porous material [D. K. Wilson, V. E. Ostashev, and S. L. Collier, J. Acoust. Soc. Am. 116, 1889–1892 (2004)]. An upstream flow condition consisting of quasiwavelets (analogous to turbulent eddies) is also used to create well-developed, realistic turbulence. This simulation approach is shown to provide detailed simulations of the production of pressure fluctuations in and around a porous windscreen.
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