简介：TheasymmetricinletvelocityprofilehasbeenobservedinphantommodelusingLDAandinhealthsubjectsusingMagnetResonance(MR).TheeffectsofasymmetricinletaxialvelocityprofileontheflowfieldandtheWallShearStress(WSS)ofcarotidbifurcationwerenumericallystudiedhereinwiththeTF-AHCBmodel.TheresultsshowthattheWallShearStressGradient(WSSG)inthefrontpartofthesinusforinward-tiltinginletaxialvelocityprofileisnearly2timesofthatforthesymmetriconeinthebeginningofsystole,theendofsystole,anddiastole,respectively.TheareaofWSSbelow5×10-3Paattheouterwallofthesinusforoutward-tiltinginletaxialvelocityprofileis1.5timesofthatfortheinward-tiltingoneduringdiastoleofthecardiaccycle.Theasymmetricinletvelocityprofilescanreducetheflowvelocityneartheinnerwallofthesinus,whichhasbeennormallyconsideredahighvelocityregion.Itisconcludedthatbesidesbifurcationgeometryandflowwaveform,theasymmetryofinletvelocityprofileisprobablyafactorinfluencingatherosclerosis.

简介：ByusingtheReynoldsStressClosureModel(RSM),turbulentCounter-Gradient-Transport(CGT)phenomenonwasnumericallyinvestigatedinasymmetricflowwithajet,andthecomputationalresultswerecomparedwithexperimentaldata.ThecomputationalresultsshowthatthenegativeturbulentenergyproductiononlyappearsatsomecertainstationsinCGTregion,thisfactindicatesthattheCGTphenomenonexistsmorewidelythanthenegativeturbulentenergyproduction;whiletheCGTregionexistsallalong,itgraduallyshrinksinthefavorablepressuregradientzoneuntilthepositionofthewingcentralpartisreached,whereitvanishes,butitappearsintheadversepressuregradientregion;inaddition,thelocationintheflowwhereuv=0switchedsides,relativetowhere()U/()y=0,fromfavorablepressuregradienttoadversepressuregradient.ThepressuregradienttakesanimportanteffectontheregionofnegativeturbulentenergyproductionandCGT.

简介：Theflowaroundtwoplateshavingasymmetricbeveledtrailingedgeplacedside-by-sideinauniformstreamwereinvestigatedbothnumericallyandexperimentally.Twoplateswithspacingratioof1.0andbeveledtrailingedgeofangle20oweretestedatReynoldsnumbersequalto3.97×104.Thenumericalsimulationresultsdisplayedthattheflowseparatesononeplatebeveledtrailingedgesurface.Thevortexformationandsheddingfromthisplateledtodeflectingtheflowtowardtheotherplateandconsequentlythewakebehindtheplatesshowedanasymmetricdevelopment.Thephotographsobtainedfromtheflowvisualizationconfirmedthenumericalresultsconcerningtheflowseparationandvortexformation.Itwasalsofoundthatthecomputedpressuredistributiononthetwoplatesurfaceswasdifferent,particularlyonthebeveledtrailingedgesurfacesandontheflatsides.