DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chun, S | ko |
dc.contributor.author | Liu, YZ | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.date.accessioned | 2009-11-30T01:09:54Z | - |
dc.date.available | 2009-11-30T01:09:54Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2004-10 | - |
dc.identifier.citation | EXPERIMENTS IN FLUIDS, v.37, pp.531 - 546 | - |
dc.identifier.issn | 0723-4864 | - |
dc.identifier.uri | http://hdl.handle.net/10203/13622 | - |
dc.description.abstract | The spatio-temporal characteristics of the wall-pressure fluctuations in separated and reattaching flows over a backward-facing step were investigated through pressure-velocity joint measurements carried out using multiple-arrayed microphones and split-film probes. A spoke-wheel-type wake generator was installed upstream of the backward-facing step. The flow structure at the effective forcing frequency (St(f)=0.2) was found to be well organized in terms of wall pressure spectrum, cross-correlation, wavenumber-frequency spectrum, and wavelet auto-correlation. Introduction of the unsteady wake (Stf=0.2) reduced the reattachment length by 10%. In addition, the unsteady wake enhanced the turbulence intensity near the separation edge and, as a consequence, enhanced the quadrupole sound sources; however, the turbulence intensity near the reattachment region was weakened and the overall flow noise was attenuated. The greater organization of the flow structure induced by the unsteady wake led to a weakening of the dipole sound sources, which are the dominant sound sources in this system. The dipole sound sources generated by wall pressure fluctuations were calculated using Curle's integral formula. | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | SPRINGER | - |
dc.subject | BACKWARD-FACING STEP | - |
dc.subject | BOUNDARY-LAYER | - |
dc.subject | COHERENT STRUCTURE | - |
dc.subject | BUBBLE | - |
dc.subject | VORTICES | - |
dc.subject | ARRAY | - |
dc.title | Wall pressure fluctuations of a turbulent separated and reattaching flow affected by an unsteady wake | - |
dc.type | Article | - |
dc.identifier.wosid | 000224516100007 | - |
dc.identifier.scopusid | 2-s2.0-7044272604 | - |
dc.type.rims | ART | - |
dc.citation.volume | 37 | - |
dc.citation.beginningpage | 531 | - |
dc.citation.endingpage | 546 | - |
dc.citation.publicationname | EXPERIMENTS IN FLUIDS | - |
dc.identifier.doi | 10.1007/s00348-004-0839-6 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Sung, Hyung Jin | - |
dc.contributor.nonIdAuthor | Chun, S | - |
dc.contributor.nonIdAuthor | Liu, YZ | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | backward-facing step | - |
dc.subject.keywordAuthor | unsteady wake | - |
dc.subject.keywordAuthor | dipole sound source | - |
dc.subject.keywordPlus | BACKWARD-FACING STEP | - |
dc.subject.keywordPlus | BOUNDARY-LAYER | - |
dc.subject.keywordPlus | COHERENT STRUCTURE | - |
dc.subject.keywordPlus | BUBBLE | - |
dc.subject.keywordPlus | VORTICES | - |
dc.subject.keywordPlus | ARRAY | - |
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