fluent12新特性

ANSYS,Inc.

1Introduction

ANSYSFLUENT12.0containsnewfeaturesanddefectfixes.NewfeaturesarelistedinSection2ofthisdocument.Section3providesalistofsupportedplatforms.KnownlimitationsarelistedinSection4.Section5containsalistoflimitationsliftedinANSYSFLUENT12.0andSection6isalistofupdatesaffectingcodebehavior.

Note:ANSYSFLUENT12.0willnowbeinstalledunderANSYSInc/v120/fluenton

Windowsandansysinc/v120/fluentonLinuxandUnixplatforms.

1.1

InstallationProceduresforANSYSFLUENT(WindowsandUNIX/LinuxPlatforms)

InstructionsforinstallingANSYSFLUENTareincludedintheANSYSInstallationdoc-umentation.ThisdocumentationisincludedintheANSYSDocumentationpackage.PleaseviewtheFLUENTProductPageontheUserServicesCenter(www.fluentusers.com)formoreinformation.

IfyouhaveusedFLUENTLauncherforFLUENT6.3orapreviewversionofFLUENT12,youwillneedtoresetthedefaultvaluesinFLUENTLauncherasdescribedinthedocumen-tationforusingFLUENTinWorkbench,availablefromtheANSYSFLUENT12.0Docu-mentation(www.fluentusers.com/fluent12/doc/ori/v120/fluent/fluent12.0/help/index.htm)page.

PleasealsonotethatGTPowerandWAVEarenowpartofthestandardFLUENT12installationpackageandnolongerneedtobedownloadedseparately.

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2NewFeaturesinANSYSFLUENT12.0

NewfeaturesavailableinANSYSFLUENT12.0arelistedbelow.•Solver

–First-to-second-orderblending

–Improvedrobustnessofthedensity-basedimplicitsolverviaexplicitrelaxation–Differentiablelimiterforimprovedrobustnessof2ndordersolutions–AbilitytouseW-cycleinparallelforAMGsolver

–Recursiveprojectionmethodoptionforimprovedstability(coupledpressure-basedsolver)–Solutionextrapolationfortransientsimulations–Improvedadaptivetimestepping–Cell-centroidalignedlimiter

–Enablingviscousdissipationworkautomaticallyincludespressureworkandkineticenergyterms–LSQsetasthedefaultgradientreconstructionscheme–Solutionsteeringforthedensity-basedsolver•Models

–Ffowcs-Williams&Hawkings(FW-H)acousticsmodel

∗Compatibilitywiththedensity-basedexplicitsolver,implicitunsteadyformulation

∗Compatibilitywiththedensity-basedexplicitsolver,explicitunsteadyformulation.

∗Broadbandnoisesourcesavailablewiththedensity-basedexplicitsolver∗AbilitytoexportdipolesounddatafromsurfacestoVirtualLabinCGNSformat

∗AbilitytoexportquadrapolesounddatafromvolumestoVirtualLabinCGNSformat–Turbulencemodeling

∗FourequationSSTtransitionmodel∗VortexmethodforpressureinletswithLES

∗SpectralsynthesizermethodforpressureinletswithLES

∗AbilitytouseVortexMethodandSpectralSynthesizerwithDESsimula-tions

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∗DynamicSGSmodelforvariable-densityflows

∗UDFaccesstocorrelationsusedinSSTtransitionmodel∗Abilitytodisplaywall-distancebasedReynoldsnumber∗GUIoptionforselectingtheSAnear-walldamping

∗Scalablewallfunctionapproachforwallfunctionbasedturbulencemodels∗DelayedDESforimprovedpredictionofseparationforexternalaerody-namics

∗ImprovedWaltersmodel(turbulencetransition)–Heattransfer

∗DOradiationenhancements

·Improvedtreatmentofpartiallyspecularwalls·Absorptionatspecularwallsbasedonwallemissivity·Specificationofbeamdirectionasaprofile

·Abilitytospecifydiffuseirradiationcomponentatsemi-transparentwalls

·First-to-second-orderblendingforDOdiscretization(TUIonly)∗Solarloadradiationenhancements

·Abilitytocontrolsolartransmissivitythroughboundaries∗S2Sradiationenhancements

·Supportforsymmetryboundaryconditionwhenusingraytracingapproachforviewfactors

·ViewfactorcalculationsusingRayTracingapproach·Improvedclustersizingcontrolonradiatingsurfaces·Newutilitytomanagesurfaceparticipation

·Abilitytocomputethefacespersurfaceclusterforactivesurfaces∗P1radiationenhancements

·Accountingfortherefractiveindex∗Shellconduction

·Compatibilitywithsemitransparentwalls

·Fastercreationofshellconductionzonesinparallel·Temperaturedependentthermalconductivityinshellzones

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–Heatexchanger

∗Dualcellheatexchangermodel

∗AbilitytoplotNTUasafunctionofmassflowrate∗Supportforparallelflowandcounterflowheatexchangers∗Abilitytoprintormonitortotalheatrejection∗HeatexchangerreportingavailablethroughGUI∗Multipassdualheatexchanger

–Speciestransport,reactions,andcombustion

∗StiffchemistryforEulerianmultiphase

∗Abilitytomodelchemicalreactionswiththerealgasmodel

∗Abilitytoimportmechanismfileswithmultiplesurfacereactionmecha-nismsforusewiththeKINeticsmodule.∗DQMOM-IEMmodel

∗Optiontoinputmolefractionsforspeciesinsteadofmassfractions∗ImprovedspeedofPDFtablelookup∗Moss-Brookessootmodel

∗UseofKINeticsroutinestoevaluatespecificheatandenthalpy∗EnhancedCoherentFlameletmodel(ICengineapplications)∗Zimontturbulentflamespeedwalldamping

∗FuelNOxmodelforsimultaneousdropletsandparticles∗SupportforISATv5.0

∗Abilitytosettimeexponentforsparkignitionmodel∗Abilitytomodelcoveragedependentsurfacereactions

∗AbilitytoimportflameletlibraryfilesgeneratedbyusingtheCFX-RIFutilityavailableinCFX

∗Inertmodel:transportofinertspecies(EGRinICengines)

∗Abilitytousethepartiallypremixedmodelwithempiricalfuelandem-piricalsecondarystreamoptions–SolidificationandMelting

∗OptiontoselecttheLeverorScheilruleforalloysolidification

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–Discretephasemodeling

∗Customizedparticlehistoryfile

∗Abilitytostart/stopinjectionsasafunctionofcrankangle

∗ImprovedconsistencyofDPMreports,includingenergyandmassbalanceswithradiationandcombustion

∗AbilitytowriteselectedinjectionstoafileandreadintoanotherANSYSFLUENTsession

∗VaporizationlawsforICengineenvironments∗Abilitytoinjectanddisplaymasslessparticles–VOFmodel

∗VOFexplicitschemesforEulerianmultiphase

∗AbilitytoplotphaseIDswhenmorethan2phasesarepresent∗Multi-fluidVOF

·Phasedraginteraction·Surfacetension

∗Numericalwavetankboundarycondition–Eulerianmultiphasemodel

∗Volumefractionpressure-velocitycouplingforgranularandgas-liquidflows,includingmasstransfer

∗Pressure-velocitycouplingforgas-liquidandgranularflows,includingmasstransfer

∗IACmodelusingIshii-Kimkernelsforbreakupandcoalescence∗IACmodelusingHibiki-Ishiikernelsforbreakupandcoalescence∗OptionalturbulentdissipationmodelsforIACkernels∗Universaldraglawsformultiphasesimulations

·AbilitytocalculateanddisplaycellaveragedquantitiestakenfromLagrangianphase

·AccountingofLagrangianphasevolumefractioninEulerianmulti-phasemodel

·Collisionalforcebasedongranulartemperatureandrelaxationofvol-umefractionfield

·GidaspowandSyamlal-Obriendraglaws∗Densediscretephasemodel∗Immisciblefluidmodel

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∗Evaporation-condensationmasstransfermodel∗Cavitation

·Improvedrobustnessforcavitationmodeling(activatedbychoosingthecavitationcheckbox)

·Schnerr-SauerandZwartetalcavitationmodels(uncheckcavitationcheckboxandsetmasstransfermechanismtocavitation)

–Mixturemodel

∗Abilitytomodelturbulentdiffusionforce(consistentwithEulerianmodel)–Populationbalance

∗Compatibilitywiththecoupledmultiphasesolver

∗Abilitytoexpressbreakagekernelthroughseparatefrequencyandbreak-agepdffunctions∗Lehrmodel(gas-liquid)

∗Generalizedpdfformultiplebreakage

∗Ramakrishnannumericalmethodsforpopulationbalance–Mixingplanemodel

∗Abilitytoperformmassaveraging∗Abilitytoperformmixed-outaveraging

•Boundaryconditions

–AbilitytousewildcardstoselectboundaryandcellzonesintheTUI–Abilitytodefineinputandoutputparametersforboundaryandcellzones–AbilitytospecifyReynoldsstressprofilesatinletsforthevortexmethod(withtheLESturbulencemodel)–Boundaryconditionfilecontentsexpandedtoincludeallcasesettings(withtheexceptionofthemesh)–Improvednumericalaccuracyofsurfaceintegralsonboundaryzones–Massflowinlet

∗UDFhookforflowrate

∗Abilitytospecifyswirlcomponent

∗Temperatureextrapolationforflowexitingtheboundary(pressure-basedsolveronly)

∗Abilitytospecifyconditionsallinrelativeorabsolutereferenceframe∗Allowmassflowinlettooperateasanoutflow(profilepreserving)

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–Pressureinlet

∗Pressureextrapolationmethod(TUIonly;density-basedsolveronly)∗Abilitytospecifyswirlcomponent

∗Abilitytospecifyconditionsallinrelativeorabsolutereferenceframe–Pressureoutlet

∗Optiontospecifystrongaveragepressureenforcement(TUIonly;DBNSsolveronly)

∗Improvedtargetmassflowrateconditionatpressureoutlets–Outflow

∗DegassingboundaryconditionfortheEulerianmultiphasemodel(seetheUDFManualformoredetails)–Pressurefarfield

∗Abilitytospecifyconditionincylindricalcoordinates

•Profiles

–Linearinterpolationofprofiledata

–Plottingofprofileswithrespecttocoordinatedirectionortime–Plottingofinterpolatedprofiledataonaface•Materialproperties

–Realgasmodelcompatiblewiththepressure-basedsolver–Redlich-Kwongequationofstate

–AdditionalmaterialsfromNISTdatabaseaddedforusewiththerealgasmodel–Abilitytoinputcoalparametersviaproximateandultimateanalysis–Abilitytosetthesolidificationpartitioncoefficientasafunctionoftempera-ture

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•Dataimportandexport

–FSIone-waycouplingviaimporteduser-definedsurfaces

∗AbilitytoimportABAQUS,MechanicalAPDL,NASTRAN,PATRANsurfacemeshesandinterpolateANSYSFLUENTdatatothemeshandexportitinthesameformat

∗AbilitytoimportABAQUS,MechanicalAPDL,NASTRAN,PATRANvolumemeshesandinterpolateANSYSFLUENTdatatothemeshandexportitinthesameformat

∗AbilitytodisplaytheimportedFSImeshwithANSYSFLUENTsurfaces∗AbilitytowriteANSYSFLUENTdatatoimportedsurfaceandvolumemeshes

∗Abilitytoexportmultiplefileformatsorvariablesviaautomaticexportfortransientcalculations

∗AbilitytoselectinternalsurfacesforexporttoEnSightGoldformat∗Supportforcell-baseddataexportfortransientEnSight–Abilitytoimport3DABAQUSfilesin.odbformat

–Abilitytosavelight-weightdatasetsduringunsteadysimulationsforpostpro-cessinginCFD-Post–AbilitytocreatetransientdataexporttoEnsightfromexistingANSYSFLU-ENTdatafilesatvarioustimes–AbilitytoimportmeshfilesinthebinaryTecplotformat•Mesh

–Reducedmemoryrequirementforpolyhedraconversion

–AbilitytoreplacethemeshinacurrentANSYSFLUENTsessionwhileretain-ingallcurrentcasesettings–Repairface-handednessoptionforhigh-aspectratiomeshes(TUIonly)–Morerobustcreationofperiodics

–Supportofmany-to-manynonconformalswithmixedfluidandsolidzones–Skewnessreports(ICengineapplications)

–Abilitytoenablenonconformalinterfaceswithmixedzones(enabledasde-fault)–Anisotropicrefinementofboundarylayers

–Automaticallydetectperiodicshifts(rotationalangle/translationaloffset)atnon-conformalinterfacesandreportintheMeshInterfacedialogbox

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•Movingmeshes

–Layeringwithnon-constantlayerheight

–AbilitytoexecuteTUIcommandviaadynamicmeshevent–ImprovedMDMforsteady-statedeformations

–Abilitytoactivate/deactivatezonesfordynamicmeshsimulations

–Abilitytousethein-cylindermodelingtoolIC3Mforin-cylindersimulations–EnhancementstothedynamicmeshGUI•PorousMedia

–Improvedrobustnessandaccuracyofporousmediawiththedensity-basedsolver–AbilitytomodelanisotropicporousmediausingphysicalvelocityformulationwiththeEulerianmultiphasemodel•Parallelprocessing

–Improvedparallelscalability

–Abilitytohandlecaseswithmorethan700millioncells(x86bitLinuxplatformsonly)–Enhancedspeedofcellmigration

–Improvedloadbalancingbyincludingthreadweightsinparallelpartitioning–Parallelprocesscleanuponabort–Autoselectionofinterconnectprotocols

–Compilerperformanceimprovementsforbitx86platforms–SupportforHPMPIonWindows

–SpeedupofcasefilereadingandwritingusingstandardIO–SpeedupofdatafilereadingandwritingusingstandardIO–SupportforHPMPIon32-bitWindowsport

–SupportforOpenMPIonlnamdandaix51platformsforMyrinetandInfiniband–ParallelMPI-IOfordatafiles(.pdat)

–ImprovedscalabilityofDPMsimulationsinparallel–Speedupofauto-partitioningusingParMetisinparallel

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•Memorymanagement

–Abilitytomoreaccuratelytrackmemoryallocationsanddeallocationsinpar-allel–AbilitytoprintoutmemoryusagebyeachANSYSFLUENTprocess(TUIonly)–AbilitytoprintoutsystemlevelmemoryandCPUnumber/speed/loadoneachnoderunningFLUENT•Graphics,post-processing,andreporting

–Improvedpost-processingaccuracyfordatastoredonflowboundaryfaces–Heatofcombustionreports–Q-criterionforLES/DESmodels–SupportforPNGformat–ICengine-specificoutputpanel

–Abilitytocalculatemomentsaboutanaxis

–Abilitytopostprocessparticlesolidspeciesmassfraction(withthediscretephasemodel)–Abilitytopostprocessparticlesurfacereactionrates(withthediscretephasemodel)–Abilitytopostprocesstheparticleunburntcharfractionandnon-releasedvolatiles–OptiontohidetheANSYSlogointhegraphicswindows

–AbilitytolaunchCFD-PostfromtheANSYSFLUENT12interface•User-definedfunctions(UDFs)andscalars(UDSs)

–User-definedblackbodyemissionfactor(Plancksfunction)–User-definedheatcapacity–User-definedlayerheight

–UDFmacrofortheignitionmodel

–AbilitytoaccesspropertiesforthepartiallypremixedmodelviaUDF–AbilitytoaccessturbulentSchmidtnumberviaUDF–SpeciesmassfractionsincludedinspecificheatUDFmacro•UserInterface

–Single-framegraphicaluserinterface–ImprovedrobustnessofTUIjournaling

–ExpandedsuiteofCaseCheckrecommendations

–Abilitytotogglebetweenembeddedanddetachedgraphicswindows

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•SOFCandPEMFuelCellModule

–IntegratedPEM/SOFCframework–ResolvedMEAforSOFCmodeling–AbilitytomodelPEMmembraneasasolid

–AbilitytorestrictgasdiffusionacrossthePEMmembraneusingasolid–Optiontomodelcurrentcollectorsasporousmedia–Abilitytomodelmulticomponentdiffusion

–AbilitytomodelelectrolysisintheResolvedMEAmodel–TUIforResolvedMEAfuelcellmodels

–AbilitytomodeltemperaturedependentleakagecurrentintheunresolvedSOFCmodel–AbilitytomodelleakagecurrentintheResolvedMEAmodel–AutomaticstacksetupwiththeResolvedMEAmodel

–AbilitytouseanisotropicelectricalandthermalconductivitiesinGDL(Re-solvedMEAmodel)–User-specifiedCO/H2split(SOFC)–Multiplecurrentinput(SOFC)

–Abilitytospecifytime-dependenttotalcurrentandcellvoltageinputs(zero-thicknesselectrolyteSOFCmodel)

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3SupportedPlatformsforANSYSFLUENT12.0

Platform/OSlevelsthataresupportedinthecurrentreleasearepostedontheUserServicesCenter(www.fluentusers.com).

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cANSYS,Inc.March26,20094KnownLimitationsinANSYSFLUENT12.0

ThefollowingisalistofknownlimitationsinANSYSFLUENT12.0.•Fileimport/export

–ThefollowingarethelatestsupportedversionsofsoftwarefromwhichANSYSFLUENTimportsfiles,ortowhichANSYSFLUENTexportsfiles:

FormatABAQUSAltairHYPERMESHMechanicalAPDLASCIIAVSCGNSDataExplorerEnSight6(TUIonly)EnSightCaseGoldFASTFIELDVIEWGambitI-DEASLSTC-DYNANASTRANPATRANPTCMECHANICATECPLOTSupportedVersion6.65.112.0–5.02.44.27.67.61.312.02.411.0970Bulkdatainputfile-MSC.NASTRAN2005OUTPUT2datafile-NX/NASTRAN53.0239.0(Export).7.1-10(Import)–DataexporttoMechanicalAPDLresultfileisnotavailableonthelnamdandlniaplatforms.(MechanicalAPDLdataexportto.cdbfileisavailableonallplatforms)–WhenexportingEnSightCaseGoldfilesfortransientsimulations,thesolvercannotbeswitchedbetweenserialandparallel,andthenumberofcomputenodescannotbechangedforagivenparallelrun.Otherwise,theexportedEnSightCaseGoldfilesforeachtimestepwillnotbecompatible–EnSightexportwithtopologychangesisnotsupported

–ToproperlyviewFieldviewUnstructured(.fvuns)resultsfromaparallelAN-SYSFLUENTsimulation

∗MeshfilesmustbeexportedfromtheparallelsolverviatheTUIcommandfieldview-unstruct-grid

∗MeshanddatafilesshouldallbeexportedfromparallelANSYSFLUENTsessionswiththesamenumberofnodes

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∗Importof3DABAQUSfilesin.odbformatislimitedtothefollowingplatforms:lnx86,lnamd,lnia,aix51,hpux11ia,hpux11∗TecplotfileimportdoesnotsupporttheTecplot360fileformat

•Mesh

–Boundaryzoneextrusionisnotpossiblefromfacesthathavehangingnodes–Thefollowingfeaturesareincompatiblewithpolyhedralcelltypes:

∗Moving/deformingmesh

•Models

–ANSYSFLUENTsupportstheChemkinIIformatforOppdifflameletimportonly–Non-encapsulatednon-conformalandslidinginterfacesarepossibleonlywiththenew,improvedinterfacealgorithm–Thesurface-to-surface(S2S)radiationmodeldoesnotworkwithslidingandmoving/deformingmeshes–Theworkpilealgorithmisnotcompatiblewiththewallfilmboundarycon-dition–Theshellconductionmodelisnotapplicableonmovingwalls–Theheatexchangermodelisnotcompatiblewithmeshadaption

–TheFLUENT/REACTIONDESIGNKINeticscouplingisnotavailableonthefollowingplatforms:win–FluidStructureInteraction(FSI)couplingwithABAQUS(viaMpCCi)isnotsupportedontheUltraplatform–DO-Energycouplingisrecommendedforlargeopticalthicknesscases(>10)only–FMGinitializationisnotavailablewiththeshellconductionmodel–FMGinitializationisnotcompatiblewiththeunsteadysolver

–VisualC++2005redistributableSP1isrequiredinordertoruntheraytracingutilityforS2SviewfactorcalculationsontheWindows32-bitplatform.ItisavailableaspartoftheinstallationprerequisitesintheR12.0installer–TheMHDmoduleisnotcompatiblewithEulerianmultiphasemodels

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•Parallelprocessing

–Thesefeaturesarecurrentlyunavailableintheparallelsolver:

∗Discretetransferradiationmodel(DTRM)∗ContinuousFiberModel(CFM)add-onmodule

∗Conformalmeshadaption(hanging-nodeadaptionisavailableinthepar-allelsolver)

∗Dataexporttonon-nativeformatsotherthanEnSight,FIELDVIEW,Tecplot,andthegenericheatfluxdatafile

•Platformsupportanddrivers

–WindowsmachinesusingHPMPIarerequiredtobeloggedontoanetworkdomain.Forsharedmemoryparallelrunsonamachinedisconnectedfromthenetwork,MPICH2isrecommended–ANSYSFLUENT12.0isnotcompatiblewiththejobscheduleronHPCServer2008withthepackagedversionofHPMPI.ThedefaultMPI(MSMPI)maybeused,orHPMPIv1.2maybeinstalled.BesuretosettheHPMPIROOTpointingtothenewversion–TheMVAPICH,MPICHMX,andCRAYXMPIshavebeendroppedfortheLinuxAMD-bitplatform–TheminimumOSrequirementsforLinuxareSLES10orRedHatEnterprise4.0–Thepathnamelengthtothecpropep.solibrary(includingthelibname)islimitedto80characters.(LinuxOpteronclusterusingInfinibandinterconnectonly)–AspecificFujitsuportisnolongeravailable.ThearchshouldbemanuallysettoUltra–OSlevel5300-07(maintenancelevel7)orhigherisrequiredontheIBMAIXplatform–TheHOOPsgraphicslibrarydoesnotsupportrunningaremotedesktopontheWindowsXPplatform–VisittheUserServicesCenterforthelatestWindowsgraphicsFAQVersion2.0orhigherof.NETFrameworkmustbeinstalledinordertorunANSYSFLUENTontheWindows-bitplatformPleaseviewtheFLUENTProductPageonUserServicesCenter(www.fluentusers.com)formoreinformation.

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•Solver

–Thenon-iterativetimeadvancement(NITA)solverisapplicablewithonlyalimitedsetofmodels.SeetheANSYSFLUENTUser’sGuideformoredetails.–NITA(usingfractionaltimestepmethod)isnotcompatiblewithporousmedia–Thefollowingmodelsarenotavailableforthedensity-basedsolvers:

∗Volume-of-fluid(VOF)model∗Multiphasemixturemodel∗Eulerianmultiphasemodel∗Non-premixedcombustionmodel∗Premixedcombustionmodel∗Partiallypremixedcombustionmodel∗CompositionPDFtransportmodel∗Sootmodel

∗Rosselandradiationmodel∗Melting/solidificationmodel∗EnhancedCoherentFlameletmodel

∗Inertmodel:transportofinertspecies(EGRinICengines)∗Densediscretephasemodel∗Shellconductionmodel∗Floatingoperatingpressure

∗Sparkignitionandauto-ignitionmodels∗Physicalvelocityformulationforporousmedia∗Selectivemultigrid(SAMG)

–Thefollowingmodelsarenotavailableforthepressure-basedsolver:

∗Non-reflectingboundaryconditions

–Thepressure-basedcoupledsolverisnotavailablewiththefollowingfeatures:

∗Porousjumpboundarycondition∗Fixedvelocity

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•User-definedfunctions(UDFs)

–TheDEFINERWFILEmacroisnotsupportedontheWindowsplatform–InterpretedUDFscannotbeusedwhilerunninginparallelwithanInfinibandinterconnect.ThecompiledUDFapproachshouldbeusedinthiscase•Third-partysoftware

–FLUENT-PlatformLSFintegrationisnotsupportedontheMSWindowsplatform–FLUENT-SGEintegrationissupportedonlyontheAIX5.3,Sun/Ultra,andLinuxplatforms–WaveandGT-Powercouplingareavailableonlywithstand-aloneANSYSFLU-ENTandnotintheWorkbenchenvironment–Wave8.0doesnotsupportIBMplatforms•Other

–TheIRISImageandHPGLhardcopyformatsarenolongersupportedinANSYSFLUENT–ThefollowingminimumbrowserversionsarerequiredforlaunchingtheFLU-ENThelpsystem:

∗Firefoxv1.5.0.12∗Mozillav1.5∗Netscapev4.73

Note:ShouldyouencounterdifficultieslaunchingtheFLUENThelpsys-tem,pleaseupgradetonewerbrowserversionsorlaunchthebrowserbeforeopeningFLUENThelp.

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5LimitationsthatnolongerapplyinANSYSFLUENT12.0

•Therealgasmodelisnowcompatiblewiththepressure-basedsolver•TheS2SmodelisnowcompatiblewithNITA

•Thepressure-basedcoupledsolverisnowavailablewiththeEulerianmultiphasemodel

•TheFLUENT/REACTIONDESIGNKINeticscouplingisnowavailableonthefollowingplatforms:IBM,SUNUltra,LinuxAMD,andLinuxItanium

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6UpdatesAffectingCodeBehavior

•ThedefaultfontforUnixplatformshasbeenchangedfrom14pointboldfaceadobehelveticato12pointregularfaceadobehelvetica.

•Defaultbehaviorofpartiallyspecularwallshasbeenchangedtoallowforabsorptionandemission.AnrpvariableisavailabletoreturntotheFLUENT6.3default,(rpsetvar’disco/partially-specular-method1).

•Bydefault,enablingviscousdissipationenergyworkwillnowalsoautomaticallyenablethepressureworkandkineticenergyworkterms.TheseadditionaltermswillbeenabledwhenpreviouslysavedcaseswithviscousdissipationturnedONarereadintoANSYSFLUENT12,andajumpinresidualsisexpected.

•Anextraparameter,compressibility(Z),hasbeenaddedtothemacros

DEFINEDPMVPEQUILIBandDEFINEDPMHEATMASS.Forexistingrou-tines,itissufficienttoaddthisparameterwithoutanyothercodechange.Zispredefinedwith1.0beforetheDEFINEDPMVPEQUILIBfunctioniscalled.•LSQisnowthedefaultgradientreconstructionschemeinANSYSFLUENT12.•TheZimontmodelhasbeenenhancedtomorephysicallyrepresentflame-wallin-teractions.OldercasesreadintoANSYSFLUENT12willusetheoldmethod.NewcasessetupinANSYSFLUENT12willusethenewmethodandwillnotreplicatetheresultsinpreviousreleases.

•PressurehasbeenaddedtotheargumentlistforRealGasUDF.ThiswillbreakexistingUDFsusingthismacro.

•Theinletdiffusionboundarysettingisnowturnedoffbydefault.ThiswillimpactnewcasescreatedinANSYSFLUENT12;oldercasesreadintoANSYSFLUENT12willnotbeaffected.

•Thedefaultspecificheats(Cp)forspeciesingaseouscombustionhavebeenchangedfromconstantstopiece-wisepolynomialsintheANSYSFLUENT12propertydatabase.•Thedefaultvalueoflayeringcollapsefactorformovinganddeformingmeshinghasbeenchangedfrom0.04to0.2.

•ThebreakupparceldiameterintheTABsecondarybreakupmodelisnolongersam-pledfromaRosinRammlerdistribution.Instead,themeandiameterisappliedtoallbreakupparcels.ToreturntotheFLUENT6.3behavior,enteryestotheTUI

command/define/models/dpm/spray-model/randomize-breakup-parcel-diameter?•Thedefaultunder-relaxationfactorfortheP1radiationmodelhasbeenchangedfrom0.8to1.0.

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•WhenwritingUDFsfortheDPMmodel,itisnolongernecessarytodistinguishbetweenserialandparallelwhencallingparfprintfinaDEFINEDPMOUTPUTmacro.Thetryidandthepartidshouldbewrittenoutalsoinserialruns.IfthisisnotdonethentheserialoutputwillbecorruptandwillnotcontainanyparticledatafromtheUDF.

•Forthesolarloadmodel,theinternallyreflectedcomponentofsolarirradiationisnolongerignoredatcoupledandexternaltransparentboundaries.

•User-definedsourcetermsarenolongermultipliedbyporositybydefault,whendefinedinporousregionsandwhenusingthephysicalvelocityformulation,aswasdoneinFLUENT6.3.TheuserisnowrequiredtoproperlyscalevolumetricsourcetermswithintheUDF.

•MeshChecknowreportstheexistenceofdegeneratedcontactpointscreateddur-ingmeshgeneration.Thesearenodesthatareincorrectlysharedbycoincident,uncoupledwallboundaries.Ifdegeneratecontactpointsaredetected,Node-basedGradientreconstructionshouldnotbeusedinthesimulation.Toavoiderrorsinthesolution,eitherthemeshshouldbecorrectedinthepreprocessortoeliminatethesenodes,orLeastSquareGradientreconstructionshouldbeusedinsteadofNode-basedGradients.

Certainmeshmanipulations(e.g.,surfaceremeshing,movingordeformingabound-ary,zonedeactivationordeletion)canfailinmeshescontainingdegeneratecontactpoints.

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