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Time-Domain Impedance Boundary Conditions for Computational AeroacousticsIt is an accepted practice in aeroacoustics to characterize the properties of an acoustically treated surface by a quantity known as impedance. Impedance is a complex quantity. As such, it is designed primarily for frequency-domain analysis. Time-domain boundary conditions that are the equivalent of the frequency-domain impedance boundary condition are proposed. Both single frequency and model broadband time-domain impedance boundary conditions are provided. It is shown that the proposed boundary conditions, together with the linearized Euler equations, form well-posed initial boundary value problems. Unlike ill-posed problems, they are free from spurious instabilities that would render time-marching computational solutions impossible.
Document ID
19970027549
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
Tam, Christopher K. W. (Florida State Univ. Tallahassee, FL United States)
Auriault, Laurent (Florida State Univ. Tallahassee, FL United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1996
Publication Information
Publication: AIAA Journal
Volume: 34
Issue: 5
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-205218
NAS 1.26:205218
Accession Number
97N26479
Funding Number(s)
CONTRACT_GRANT: NAG1-1776
Distribution Limits
Public
Copyright
Public Use Permitted.

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