简介：Theunsteadyhydrodynamicsofabiomimeticfinattachedtoacylindricalbodyhasbeenstudiednumericallyusingacomputationalfluiddynamic(CFD)simulatorbasedonanin-housesolveroftheNavier-Stokesequations,combinedwitharecentlydevelopedmulti-block,oversetgridmethod.Thefin-bodyCFDmodelisbasedonamechanicalpectoralfindevice,whichconsistsofacylindricalbodyandanasymmetricfinandcanmimicflapping,rowingandfeatheringmotionsofthepectoralfinsinfishes.Firstthemulti-block,oversetgridmethodincorporatedintotheNSsolverwasverifiedthroughanextensivestudyofunsteadyflowspastasinglefinundergoingrowingandfeatheringmotion.Thenunsteadyflowspastthebiomimeticfin-bodymodelundergoingthesamemotionswerecomputedandcomparedwiththemeasurementsofforcesofthemechanicalpectoralfin,whichshowsgoodagreementinbothtime-varyingandtime-averagedhydrodynamicforces.Therelationshipbetweenforcegenerationandvortexdynamicspointstotheimportanceofthematchinfinkinematicsbetweenpowerandrecoverystrokesandimpliesthatanoptimalselectionofparametersofphaselagsbetweenandamplitudesofrowingandfeatheringmotionscanimprovetheperformanceoflabriformpropulsionintermsofeithermaximumforcegenerationorminimummechanicalpower.