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dc.contributor.authorBOKDE, ARUN LAWRENCE WARREN
dc.date.accessioned2010-08-23T15:18:07Z
dc.date.available2010-08-23T15:18:07Z
dc.date.issued1999
dc.date.submitted1999en
dc.identifier.citationBokde ALW, Lueptow RM & Abraham B, Spanwise structure of wall pressure on a cylinder in axial flow, Physics of Fluids, 11, 1, 1999, 151 - 161en
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/40575
dc.descriptionPUBLISHEDen
dc.description.abstractThe spanwise structure of wall pressure fluctuations was measured in an axtisymmetric turbulent boundary layer on a cylinder parallel to the mean flow at a momentum thickness Reynolds number of 2530 and a boundary layer thickness to cylinder radius ratio of 4.81. The measurements were made using miniature hearing aid type condenser microphones with spanwise separations of 0?, 10?, 20?, 30?, 60?, and 90?. An improved wall pressure power spectrum was obtained at low frequencies by utilizing a two-point subtraction method to remove low frequency acoustic background noise of the wind tunnel. The spanwise correlations indicate that the spanwise coherent length of the wall pressure is 30? (78v/u? or 0.11?). The spanwise coherence is weak and concentrated in a frequency band that is substantially lower than the most energetic frequency band of the wall pressure spectrum. A mode number-frequency decomposition of the wall pressure spectrum indicates that the greatest quantity of energy is in the circumferential modes nearest zero. Modes -4 to 4 contain most of the wall pressure energy. Conditional sampling by pressure peak and VITA detection schemes (where VITA was applied to wall pressure to detect strong pressure gradient events) indicate that the spanwise extent of the high pressure peaks and high wall pressure gradients is 60? (156v/u? or 0.22?.en
dc.description.sponsorshipThis work was supported by the Naval Undersea Warfare Center Division Newport, Newport, RI, Dr. Marilyn Berliner and Dr. David Hurdis, program managers.en
dc.format.extent151en
dc.format.extent161en
dc.language.isoenen
dc.publisherAmerican Institute of Physicsen
dc.relation.ispartofseriesPhysics of Fluids;
dc.relation.ispartofseries11;
dc.relation.ispartofseries1;
dc.rightsYen
dc.subjectAcousticsen
dc.subjectmicrophonesen
dc.titleSpanwise structure of wall pressure on a cylinder in axial flowen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/bokdea
dc.identifier.rssinternalid50080
dc.identifier.rssurihttp://dx.doi.org/10.1063/1.869909en


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