Modeling infrasound propagation using the Fourier pseudo-spectral method

As part of an undergoing effort to model infrasound propagation in the atmosphere, a pseudospectral time-domain method is employed to solve the linearized equations of thermo-viscous compressible gas dynamics in a two dimensional stratified atmosphere over a flat rigid ground surface. The system of...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-04, Vol.129 (4_Supplement), p.2444-2444
Main Authors: Waxler, Roger, Velea, Doru
Format: Article
Language:English
Online Access:Get full text
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Summary:As part of an undergoing effort to model infrasound propagation in the atmosphere, a pseudospectral time-domain method is employed to solve the linearized equations of thermo-viscous compressible gas dynamics in a two dimensional stratified atmosphere over a flat rigid ground surface. The system of equations is transformed from the spatial to the wavenumber domain using a spatial Fourier transform for the horizontal variables and a generalized trigonometric transform (to account for the ground surface) for the vertical variable. Time evolution is computed numerically in the wavenumber domain using a Runge–Kutta algorithm. In this initial work only viscous and thermal losses are taken into account. To handle the no-slip condition at the ground, acoustic boundary layer theory is used. Numerical results showing the effects of complex meteorology on the the propagation of an acoustic pulse will be presented. [Work supported by US Army SMDC.]
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3588004