Absorbing boundary conditions for a spherical monopole in a set of two‐dimensional acoustics equations
作者:
Victor W. Sparrow,
Richard Raspet,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 87,
issue 6
页码: 2422-2427
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.399087
出版商: Acoustical Society of America
关键词: TWO−DIMENSIONAL CALCULATIONS;BOUNDARY CONDITIONS;SOUND SOURCES;MONOPOLES;FINITE DIFFERENCE METHOD;ABSORPTION
数据来源: AIP
摘要:
The numerical solution of the two‐dimensional (2‐D) acoustic equations as a hyperbolic system by the use of the finite‐difference method has been investigated. For efficient computation, the numerical domain must be truncated by an absorbing boundary condition. Deriving nearly reflectionless conditions that are both accurate and stable for spherical waves is nontrivial. In this paper, absorbing boundary conditions are developed for the case of an acoustic pulse radiated from a spherical monopole source. Numerical results are presented comparing conditions based on a characteristic variable formulation to conditions based on the Bayliss–TurkelB1condition. It was found that the best conditions were those employing the Bayliss–TurkelB1condition on the acoustic density deviation (or equivalently the acoustic pressure) and a particular condition on the particle velocity component normal to the absorbing boundary.
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