FORCE CHARACTERISTICS AND VORTEX SHEDDING OF A PITCHING FOIL IN SHEAR FLOWS

(整期优先)网络出版时间:2005-01-11
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Theobjectiveofthisstudyistodealwithunsteadyforceactingonapitchingfoilinshearflowandtostudytherelationoftheforcecharacteristicswithvortexsheddingnearthefoil.Thetwo-dimensionalincompressibleNavier-Stokesequationsinthevorticityandstream-functionformulationweresolvedwiththefourth-orderessentiallycompactfinitedifferenceschemesforthespacederivativesandafourth-orderRunge-Kuttaschemeforthetimeadvancement.Theforcecharacteristicsandvortexsheddingofthepitchingfoilinshearflowswereinvestigated.Theeffectsofsometypicalfactors,includingtheincomingflowshear,theoscillatingfrequencyandamplitude,onthevortexsheddingandforcebehaviorwereanalyzedanddiscussed.