fluent 6.0 内部培训资料

GettingFluent6toworkSlidingGridsSlidingGridsManyengineeringCFDproblemsinvolveslidinggridsTypicallythesproblemsinvolvefans,turbines,pumpsandrotorsFluenthasthreeoptionsforsettingupproblemsformovingzonesTheseareSlidingMesh,MovingReferenceFrameandMixingPlaneThisLectureThislecturedemowillteachyouhowtosetupaslidingmeshproblem.ItisacrudestirredtsnkThedemoassumesthatyouhavesomeideaabouthowtouseGambitandtheinstructionsarethereforeabbreviated.Iftheinstructiondoesn’tmakesenseordoesn’tworkthenask!SettingupthemeshStartgambit:–gambit-idtank–selectthesolver(fluent56Thiswillbeareltivelycrudeproblem.Thetankwillbe1minradiusandwillbe2mhigh–createarealcyclinder(Volume-realcylinder)2mhigh1mradiusTheslidingmeshinthisproblemwillbeinaninnerzonethatwillencompasstherotor.Thiswillbecreatedbycreatinganinnercyclinderof0.35mradiusand2mhightandsplittingthe2mcylinderwithit.–Createarealcylinder(Volumerealcylinder)2mhigh0.35mradiusSettingupthemeshSplitthe1mcylinderwiththe0.35mcylinderwiththeSplitVolumecommand.Disablethe‘connected’buttonbeforeyoudothesplit!–Youshouldhavetwovolumes.Onetheinnercylinder(Volume1).Theotheristheouterannulus(Volume2)Itisimportantthatthetwovolumeintersectbytwofaces(6and9)whicharenotconnected.ThesewillformtheinterfacebetweentheinnerrotatingzoneandouterstationaryzoneSettinguptherotorFinallywehavetomakearotor–createarealcyclinder2mhigh,0.05mradius.Thiswillbetheshaft–createarealbrickx=0.4,y=0.1,z=0.4(Thedirectionshouldbecentred)–movethebrickupinthezdirection0.4m–Unitethebrickandtheshaft(Don’tretain)–Subtracttheshaft/rotorfromtheinnercylinder(Don’tretain)-Volume1shouldcomprisetheinnerfluidregionsurroundingtheshaftSettinguptheairportWearealsogoingtoblowairintothisthing,sowehavetoinstallairportsontherotor–createarealcylinderheight2,radius0.02buttheaxislocationshouldbecentredx.Itshouldbelieingflatacrossthebottomofthetankmovethecylinder0.3inzand-0.01inx.ItshouldintersecttheimpellerattwofacesSpliteachfacethatthisthincylinderintersectswiththecyclinderface–Splitface13withface26–Splitface15withface26Deletethethincylinder(volume3).Face13andface15shouldhavetwothinholesMeshtheinnerzoneSelecttheairportsandmeshthemwithwithameshspacingof0.02–Meshface,selectface30andface28.GambitwillautomaticallymeshthemwithapavedmeshSelecttheshaftaboveandbelowtheimpellorandmeshitwithameshspacingof0.05Selectthethinfacesoftheimpellorandmeshthesewithaspacingof0.05.Gambitwillautomaticallypavethese.Selectthesquarefacesoftheimpellerandmeshthese.Theedgesarealreadymeshed,soyoudon’tneedtoselectasizeandthemeshshouldbemappedMeshtheinnerzoneSelectthetwofacesthatwillformtheinterfacebetweentheslidingmeshzonesandmeshthenwithaspacingof0.1.Thesearefaces6and9.NotesincethetwofaceslieontopofeachothertheywillappearasonefacemeshOpemmeshvolume.Selecttheinnervolume(volume1)andmeshit.Notethatgambitwillassumeacoopermesh.Howeverthiswillnotwork.ChangetheelementsoptiontoTet/hybrid.AlledgesaremeshedsoyoudonotneedtospecifyasizeMeshtheouterzoneOpenmeshface.selectthefaceatthebottomofthetank(shouldbeface2).CheckedthattheelementsisQuadandthetypeisMap.OntheProjintervalsenter10.MeshthefaceOpenmeshvolume.Selecttheoutervolume(shouldbevolume.2)andmeshit.Acceptthedefault(cooper)anddon’tbothspecifyingthesizeAssumingyougotthisfarTheinnerzonehasbeenmeshedwithanunstructuredtetrahedralgrid.Thisislessthanidealnumerically.Howeveritwasrelativelyeasytogeneratethegrid.Thisisthetradeoff.Theouterzonehasbeenmeshedwithacoopergrid.ThisresultedinaniceOgrid.Thisisactuallyabettergrid.Youwillnotethatitwasgeneratedbyprojectingtwoexistingfacegridsalongthedomain.IfyoucangetgambittodothissortofthingforyouwillsaveyourselfalotofworkAssignBoundaryZonesselectdisplayattributesandturnofmeshvisibility.NotethisjusthidesthegridOpenboundaryzonesSelectthetwogasinletportsandmakethemvelocityinlets.Calltheminlet_portSelectallotherfacesontheimpellerandshaftandcallthemimpeller.MakethemwalltypesSelectallexternalboundaries(exceptthetopofthetank)andmakethemawalltypeandcallthemtankwall(makesureyoudon’tselecttheinterfacezone)selectthefacesatthetopofthetank(face1andface7).callthemtanktopandmakethemapressureoutletbcSelecteachinterfacefaceandmakethemindividuallyaninterfacetype.(theseareface6andface9)AssignContinuumZonesOpencontinuumzoneselecttheinnervolume(volume.1)andassignitfluid(automatic!)andcallitinner_flselecttheoutervolume(volume.2)andassignitfluid(automatic)andcallitouter_flExportthegrid,closegambit(save!)andopenfluentSettinguptheprobleminFluentStartfluent3dreadinthegridyouhavejustcreatedDefineMaterialsandcopyWaterliquidfromthedatabaseWefirsthavetolinkthetwointerfaces–Grid/Interfaces–assigninterface.4tozone1andinterface.5tozone2–nametheinterfacesl_meshandcreatetheinterface.closethemenuwhendoneEnabletheASMmodel–define/models/multiphase-mixture–enableimplictbodyforceOKSettingupprobleminFluentdefinephases–selectphase1.Pressset.Selectphasematerialaswater-liquidandcallitwaterOK–selectphase2.Pressset.Selectphasematerialasair.Callitair.Assignadiamterof0.001menablegravity–defineoperatingcondit