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Micro- and Macro-Fluid Dynamics and Acoustics of Resonant LinersThe objectives of this project are to perform direct numerical simulation of the micro-fluid and acoustic fields of a resonant acoustic liner and to investigate the physical processes by which incident sound waves are damped by the acoustic liner. We would like to report that our research work and results have fulfilled both objectives of the grant. The following is a summary of the important accomplishments: (1) Two dimensional direct numerical simulation of the flow and acoustic field around the cavity of resonant liner were successfully carried out; (2) The simulations of (1) were extended to include a laminar grazing flow; (3) The numerical simulations provided strong evidence that there are two principal mechanisms by which a resonant liner damps out an incident acoustic wave; (4) A validation test was performed by comparing the computed dissipation coefficients (not impedance) with impedance tube measurements done at GTRI; and (5) Some resources of this grant were used to support the development of new CAA methods. (Our work on numerical simulation of acoustic liners has benefited by the availability of these improved methods).
Document ID
20020017762
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Tam, Christopher K. W. (Florida State Univ. Tallahassee, FL United States)
Watson, Willie
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Acoustics
Funding Number(s)
CONTRACT_GRANT: NAG1-1986
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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