On the extrapolation of acoustic waves from flow simulations with vortical out flow
On the extrapolation of acoustic waves from flow simulations with vortical out flow
Feri Farassat was one of the pioneers of the use of the Ffowcs Williams & Hawkings formulation of Lighthill's acoustic analogy as a way to extrapolate radiated waves from simulations of unsteady flows. Current computational limits mean that volume source terms are often neglected, causing inaccurate acoustical predictions when entropy fluctuations or vorticity pass across the extrapolation surface. The derivation of the Ffowcs Williams-Hawkings equation is modified to allow the equivalent surface sources to be distributed over a transition layer of finite thickness rather than being confined to a single layer, in order to reduce the effect of vorticity exiting the computational domain.
217-227
Wright, M.C.M.
b7209187-993d-4f18-8003-9f41aaf88abf
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
February 2015
Wright, M.C.M.
b7209187-993d-4f18-8003-9f41aaf88abf
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
Wright, M.C.M. and Morfey, C.L.
(2015)
On the extrapolation of acoustic waves from flow simulations with vortical out flow.
International Journal of Aeroacoustics, 14 (1-2), .
(doi:10.1260/1475-472X.14.1-2.217).
Abstract
Feri Farassat was one of the pioneers of the use of the Ffowcs Williams & Hawkings formulation of Lighthill's acoustic analogy as a way to extrapolate radiated waves from simulations of unsteady flows. Current computational limits mean that volume source terms are often neglected, causing inaccurate acoustical predictions when entropy fluctuations or vorticity pass across the extrapolation surface. The derivation of the Ffowcs Williams-Hawkings equation is modified to allow the equivalent surface sources to be distributed over a transition layer of finite thickness rather than being confined to a single layer, in order to reduce the effect of vorticity exiting the computational domain.
Text
Wright & Morfey IJA 2014 revised MS v2.pdf
- Accepted Manuscript
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Accepted/In Press date: 20 August 2014
e-pub ahead of print date: 1 February 2015
Published date: February 2015
Organisations:
Acoustics Group
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Local EPrints ID: 377844
URI: http://eprints.soton.ac.uk/id/eprint/377844
ISSN: 1475-472X
PURE UUID: 2eb91fcd-2359-4dba-80e3-2ab12c74cd15
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Date deposited: 23 Jun 2015 15:48
Last modified: 15 Mar 2024 02:47
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Author:
C.L. Morfey
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