Fluent中常见问题

11UnderRelaxationRelaxationFactors-2142FLUENTFLUENTa，FLUENTRayleigh45PDFke0.20.50.50.5SIMPLECRayleigh/1.01.0PDF0.8SIMPLESIMPLERFLUENTSIMPLESIMPLEC（SIMPLE-ConsistentSIMPLESIMPLEC:SIMPLECSIMPLEC1.01.0PISO1.0PISOSIMPLESIMPLECPISOPISO1.01.0PISO1.00.30.7PISOPISO2FLUENTturbuleneeviscousrateLet'stakecareofthewarning"turbulentviscositylimitedtoviscosityratio****"whichisnotphysical.Thisproblemismainlyduetooneofthefollowing:1)Poormeshquality(i.e.,skewness>0.85forQuad/Hex,orskewness>0.9forTri/Tetraelements).{whatvaluesdoyouhave?}2)Useofimproperturbulentboudaryconditions.3)Notsupplyinggoodinitialvaluesforturbulentquantities.Y+NASAViscousGridSpaceCalculator3FLUENTreversedflowcase1.1042.pressure-outletoutflow4FLUENTpatchFluentpatchpatchpatch5PDFFLUENT（PDF）（ProbabilityDensityFunction,PDF）PDFE-LE-EPDFE-EFLUENTPDFPDFPDFNOxFLUENTFLUENTDTRMP-1RosselandDOWSGG6FLUENTGAUGEPRESSURGAUGEtotalPRESSURE1GaugeINITIALGaugePRESSURE0GAUGEPRESSURESPinf。GAUGEtotalPRESSURE!PtINITIALGaugePRESSURE^GAUGEPRESSUREPinf-INITIALGaugePRESSUREGAUGEtotalPRESSURE=Pt-INITIALGaugePRESSURE7FLUENT1.Fluent2.FluentFluentFluent->File->Hardcopy...3.TecplotFluent8FLUENTFluentCFD214-2169Fluent（）1.52（VOF）,PDFNOxRosselandNIST10FLUENTdbsmshcas,dattrn,jouprofileGambitdefault_id.dbsjoutrnGambitsavedefault_id.dbsdefault_id.joudefault_id.trnjougambitjougambitdbsgambittrngambittranscriptmshgambitexportmshfluentCaseDataFluentdatecaseProfileFile/Read/Profile...WriteProfile（Figure1）File/Write/Profile112D3Dzonezonegambitzonezonezoneudfudf12Fluent12313flunet5/6specifyboundarytypestypesinteriorinterfaceinternalinteriorinterfaceinternalinterface,interior,internalboundaryFluentInterfaceFluentinterfaceinteriorwallInteriorFluentInternal14FLUENTFlexlmLicenseFLEXlmLMTOOLSUtility-configservices->servicenameservicenamepathtothelmgrd.exefilepathtothelicensefilesaveservice,FLEXlmLMTOOLSUtility->configservices-start/stop/rereadlicensestartserver15solver2Daxisymmetricaxisymmetricswirl2D3Daxisymmetricaxisymmetricswirlaxisymmetric2Daxisymmetric2Daxisymmetricswirl3DFluent3D2DFluentx16Velocityformulation(AbsoluteRelative)RefereneeFrameAbsoluteRelativetoAdjacentCellZoneFluentIfthecellzoneadjacenttothevelocityinletismoving,youcanchoosetospecifyrelativeorabsolutevelocitiesbyselectingRelativetoAdjacentCellZoneorAbsoluteintheReferenceFramedrop-downlist.Iftheadjacentcellzoneisnotmoving,AbsoluteandRelativetoAdjacentCellZonewillbeequivalent,soyouneednotvisitthelist.SpecifyingRelativeorAbsoluteVelocityIfthecellzoneadjacenttothewallismoving(e.g.,ifyouareusingamovingreferenceframeoraslidingmesh),youcanchoosetospecifyvelocitiesrelativetothezonemotionbyenablingtheRelativetoAdjacentCellZoneoption.Ifyouchoosetospecifyrelativevelocities,avelocityofzeromeansthatthewallisstationaryintherelativeframe,andthereforemovingatthespeedoftheadjacentcellzoneintheabsoluteframe.Ifyouchoosetospecifyabsolutevelocities(byenablingtheAbsoluteoption),avelocityofzeromeansthatthewallisstationaryintheabsoluteframe,andthereforemovingatthespeedoftheadjacentcellzone--butintheoppositedirection--intherelativereferenceframe.Ifyouareusingoneormoremovingreferenceframes,slidingmeshes,ormixingplanes,andyouwantthewalltobefixedinthemovingframe,itisrecommendedthatyouspecifyrelativevelocities(thedefault)ratherthanabsolutevelocities.Then,ifyoumodifythespeedoftheadjacentcellzone,youwillnotneedtomakeanychangestothewallvelocities,asyouwouldifyouspecifiedabsolutevelocities.Notethatiftheadjacentcellzoneisnotmoving,theabsoluteandrelativeoptionsareequivalent.Fluent6.3Velocityformulation(AbsoluteRelative)Pressure-basedFluentFluentDensity-based17PDF18Fluent（）（）2D3DQUICKQUICK（Power-lawScheme）19FLUENTCourantCFL）CourantcourantnumbercourantFluentcourantnumbercourantnumbercourantnumbercourantnumbercourantnumber20FLUENTSIMPLESIMPLECPISO,FLUENTSIMPLESIMPLEC(SIMPLE-ConsistentSIMPLESIMPLECSIMPLECSIMPLEC1.01.0PISO1.0。PISOSIMPLESIMPLECPISOPISO1.01.0PISO1.00.30.7PISOPISO21Pressure-basedStandardRayleighPRESTOSecondOrderSecondOrderBodyForceWeightedSecondOrderVOFMixturePRESTCBodyForceWeightedFluent222DFLUENT3Dsetuptimecomputationalexpensenumericaldiffusion1.FLUENT4FLUENTFLUENTFLUENT4FLUENT2.//////////skewness//3.（falsediffusion）FLUENT/////23UDFcompiledinterpretedUDFFLUENTMakefileccFLUENTFLUENTFLUENTUDFUDFFLUENTFLUENTMakefileccFLUENTFLUENTFLUENTUDFUDFFLUENTUDFUDFUDFFLUENTcUDF,UDFFLUENTUDFUDFcUDFC:gotoANSI-CUDFUDFUDFUDFFLUENT;FLUENT7UDFUDFFLUENT;FLUENT7UDFUDFcCFLUENTUDFUDFCANSI-compliantccUDFudf24courant,Fluent25warning26gambitwindows:GAMBITEDIT，GRAPHICSWINDOWSBACKGROUNDCOLORBLACKVALUEWHITEMODIFY.271k=1M1G100Fluent28continuity?continuitycontinuitycontinuity29StatictemperatureandtotaltemperatureinFluentStaticTemperature(ST),TotalTemperature（TT）（0）TT1000