Abstract
The article investigates acoustic waves in a subsonic viscous thermally conducting gas. Two descriptions of the medium are compared: a description in terms of Navier–Stokes equations and a description as a quasi-gas-dynamic system based on a difference approximation of the Boltzmann equation. Reflection of acoustic waves from artificial boundaries in the numerical region is considered, and special boundary conditions are constructed to ensure damping of nonphysical modes. A difference approximation of such boundary conditions is investigated. The procedure is tested in application to viscous flow around plates.
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Dorodnitsyn, L.V. Acoustics in Viscous Subsonic Flow Models with Nonreflecting Boundary Conditions. Computational Mathematics and Modeling 11, 356–376 (2000). https://doi.org/10.1023/A:1012588328522
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DOI: https://doi.org/10.1023/A:1012588328522