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Computation of Sound Generated by Flow Over a Circular Cylinder: An Acoustic Analogy ApproachThe sound generated by viscous flow past a circular cylinder is predicted via the Lighthill acoustic analogy approach. The two dimensional flow field is predicted using two unsteady Reynolds-averaged Navier-Stokes solvers. Flow field computations are made for laminar flow at three Reynolds numbers (Re = 1000, Re = 10,000, and Re = 90,000) and two different turbulent models at Re = 90,000. The unsteady surface pressures are utilized by an acoustics code that implements Farassat's formulation 1A to predict the acoustic field. The acoustic code is a 3-D code - 2-D results are found by using a long cylinder length. The 2-D predictions overpredict the acoustic amplitude; however, if correlation lengths in the range of 3 to 10 cylinder diameters are used, the predicted acoustic amplitude agrees well with experiment.
Document ID
19970029061
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Brentner, Kenneth S.
(NASA Langley Research Center Hampton, VA United States)
Cox, Jared S.
(George Washington Univ. Hampton, VA United States)
Rumsey, Christopher L.
(NASA Langley Research Center Hampton, VA United States)
Younis, Bassam A.
(City Univ. London, United Kingdom)
Date Acquired
August 17, 2013
Publication Date
June 1, 1997
Publication Information
Publication: Second Computational Aeroacoustics (CAA) Workshop on Benchmark Problems
Subject Category
Acoustics
Accession Number
97N27769
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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