The University of Southampton
University of Southampton Institutional Repository

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
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.
1475-472X
217-227
Wright, M.C.M.
b7209187-993d-4f18-8003-9f41aaf88abf
Morfey, C.L.
d5f9a8d0-7d8a-4915-a522-bf49dee111f2
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), 217-227. (doi:10.1260/1475-472X.14.1-2.217).

Record type: Article

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
Download (229kB)

More information

Accepted/In Press date: 20 August 2014
Published date: February 2015
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 377844
URI: https://eprints.soton.ac.uk/id/eprint/377844
ISSN: 1475-472X
PURE UUID: 2eb91fcd-2359-4dba-80e3-2ab12c74cd15

Catalogue record

Date deposited: 23 Jun 2015 15:48
Last modified: 19 Jul 2019 20:42

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×