Self-Sustained Oscillations of Turbulent Flow in an Open Cavity

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dc.contributor.authorLee, Sang-Bongko
dc.contributor.authorSeena, Abuko
dc.contributor.authorSung, Hyung-Jinko
dc.date.accessioned2013-03-09T12:32:05Z-
dc.date.available2013-03-09T12:32:05Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2010-05-
dc.identifier.citationJOURNAL OF AIRCRAFT, v.47, pp.820 - 834-
dc.identifier.issn0021-8669-
dc.identifier.urihttp://hdl.handle.net/10203/96351-
dc.description.abstractDirect numerical and large eddy simulations of incompressible turbulent flows over deep and shallow cavies were performed in the range of 600 <= Re(D) <= 12, 000 to investigate the influence of the incoming turbulent boundary layer on self-sustained oscillations of the shear layer. When the turbulent boundary layer approached the open cavity with Re(D) = 3000, the energy spectra of the pressure fluctuations showed spectral peaks in the range of 0.15 <= omega <= 0.3. Conditionally averaged flowfields disclosed that the spectral peaks arise from the separation of high-speed streaky structures rather than from a geometric singularity of the cavity. The same spectral peaks were observed in a backward-facing step flow as well as in deep and shallow cavity flows, despite the different geometries of these systems. In the turbulent cavity flow of Re(D) = 12, 000, however, the peak frequencies of the energy spectra cavity lengths of L/D = land 2 were found to correspond to the Nth modes with N = 2 and 3, respectively. These modes were very similar to the frequency characteristics of self-sustained oscillations reported for laminar cavity flows. Inspection of instantaneous pressure fluctuations as well as spanwise-averaged pressure fluctuations reversed that regular shedding of quasi-two-dimensional vortical structures was responsible for the peak frequency in the energy spectra.-
dc.languageEnglish-
dc.publisherAMER INST AERONAUT ASTRONAUT-
dc.subjectCOMPRESSIBLE FLOW-
dc.subjectBOUNDARY-LAYER-
dc.subjectNUMBER-
dc.subjectSIMULATION-
dc.subjectLAMINAR-
dc.titleSelf-Sustained Oscillations of Turbulent Flow in an Open Cavity-
dc.typeArticle-
dc.identifier.wosid000278831800009-
dc.identifier.scopusid2-s2.0-77953165701-
dc.type.rimsART-
dc.citation.volume47-
dc.citation.beginningpage820-
dc.citation.endingpage834-
dc.citation.publicationnameJOURNAL OF AIRCRAFT-
dc.identifier.doi10.2514/1.44823-
dc.contributor.localauthorSung, Hyung-Jin-
dc.type.journalArticleArticle-
dc.subject.keywordPlusCOMPRESSIBLE FLOW-
dc.subject.keywordPlusBOUNDARY-LAYER-
dc.subject.keywordPlusNUMBER-
dc.subject.keywordPlusSIMULATION-
dc.subject.keywordPlusLAMINAR-
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