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Article: Sound sources in the interactions of two inviscid two-dimensional vortex pairs

TitleSound sources in the interactions of two inviscid two-dimensional vortex pairs
Authors
KeywordsEngineering
Hydraulic engineering physics
Issue Date2000
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=FLM
Citation
Journal of Fluid Mechanics, 2000, v. 419, p. 177-201 How to Cite?
AbstractThe sources of sound during the interactions of two identical two-dimensional inviscid vortex pairs are investigated numerically by using the vortex sound theory and the method of contour dynamics. The sound sources are identified and then separated into two independent components, which represent the contributions from the vortex centroid dynamics and the microscopic vortex core dynamics. Results show that the sound generation mechanism of the latter is independent of the type of vortex pair interaction, while that of the former depends on the jerks, accelerations and vortex forces on the vortex pairs. The power developed by the vortex forces is found to be important in the generation of sound when the vortex cores are severely deformed and their centroids are close to each other. The isolated source terms also explain the appearance of wavy oscillations on the time variations of the sound source strengths in the vortex ring and the two-dimensional vortex interaction systems.
Persistent Identifierhttp://hdl.handle.net/10722/44916
ISSN
2015 Impact Factor: 2.514
2015 SCImago Journal Rankings: 1.450
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTang, SKen_HK
dc.contributor.authorKo, NWMen_HK
dc.date.accessioned2007-10-30T06:13:23Z-
dc.date.available2007-10-30T06:13:23Z-
dc.date.issued2000en_HK
dc.identifier.citationJournal of Fluid Mechanics, 2000, v. 419, p. 177-201en_HK
dc.identifier.issn0022-1120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/44916-
dc.description.abstractThe sources of sound during the interactions of two identical two-dimensional inviscid vortex pairs are investigated numerically by using the vortex sound theory and the method of contour dynamics. The sound sources are identified and then separated into two independent components, which represent the contributions from the vortex centroid dynamics and the microscopic vortex core dynamics. Results show that the sound generation mechanism of the latter is independent of the type of vortex pair interaction, while that of the former depends on the jerks, accelerations and vortex forces on the vortex pairs. The power developed by the vortex forces is found to be important in the generation of sound when the vortex cores are severely deformed and their centroids are close to each other. The isolated source terms also explain the appearance of wavy oscillations on the time variations of the sound source strengths in the vortex ring and the two-dimensional vortex interaction systems.en_HK
dc.format.extent1805118 bytes-
dc.format.extent2671 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=FLMen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsJournal of Fluid Mechanics. Copyright © Cambridge University Press.en_HK
dc.subjectEngineeringen_HK
dc.subjectHydraulic engineering physicsen_HK
dc.titleSound sources in the interactions of two inviscid two-dimensional vortex pairsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1120&volume=419&spage=177&epage=201&date=2000&atitle=Sound+sources+in+the+interactions+of+two+inviscid+two-dimensional+vortex+pairsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1017/S0022112000001294en_HK
dc.identifier.isiWOS:000089739500007-

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