Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44850
DC FieldValueLanguage
dc.contributor.authorChen, J.M.en_US
dc.contributor.author陳志敏zh_TW
dc.contributor.authorFang, Y.C.en_US
dc.date2005zh_TW
dc.date.accessioned2014-06-06T08:13:56Z-
dc.date.available2014-06-06T08:13:56Z-
dc.identifier.issn0889-9746zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/44850-
dc.description.abstractThe characteristics of the flow in the wake of a plate that is normal to the free stream in its neutral position undergoing rotational oscillation has been investigated. The governing equations based on stream-function/vorticity formulation are solved numerically to determine the two-dimensional flow field structure. The numerical simulations are performed in a rotating reference frame attached to the plate. The simulations focus on the lock-on phenomenon of vortex shedding for frequency ratios of forcing Strouhal number to natural shedding Strouhal number St(e)/St(n) = 0.96-1.04 at a Reynolds number Re = 100. The time histories of drag coefficient as well as surface vorticity of the plate show amplitude modulation when the vortex shedding is not-locked-on to the plate oscillation at smaller forcing amplitude. The modulation disappears once lock-on occurs where the vortex shedding is synchronized with the plate oscillation at larger amplitude. The limits of lock-on regime bounded by the forcing frequency and amplitude are found in good agreement with the experiments conducted at higher Reynolds numbers (Re = 3600-9800). For the approach to lock-on from a lower frequency (St(l)/St(n) = 0.96) and an upper frequency (St(l)/St(n) = 1.04), the numerical simulations demonstrate significant differences in lock-on behavior, including the structure of vortices, fluctuation amplitudes of drag coefficient and surface vorticity, and route leading to lock-on. (c) 2005 Elsevier Ltd. All rights reserved.en_US
dc.language.isoen_USzh_TW
dc.relationJournal of Fluids and Structuresen_US
dc.relation.ispartofseriesJournal of Fluids and Structures, Volume 20, Issue 7, Page(s) 961-974.en_US
dc.relation.urihttp://dx.doi.org/10.1016/j.jfluidstructs.2005.005.006en_US
dc.subjectvortex sheddingen_US
dc.subjectlock-onen_US
dc.subjectoscillating plateen_US
dc.subjectcylinderen_US
dc.subjectwakeen_US
dc.titleOn the flow over a rotationally oscillating flat plate: A numerical studyen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1016/j.jfluidstructs.2005.005.006zh_TW
item.languageiso639-1en_US-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.openairetypeJournal Article-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextno fulltext-
Appears in Collections:機械工程學系所
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