SteadyState Thermal（稳态热）PPT课件下载推荐.pptx

SteadyState Thermal（稳态热）PPT课件下载推荐.pptx

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ThermalAnalysis,ChapterSix,ANSYSWorkbenchSi,TrainingManual,ThermalAnalysis,ChapterOverview,Inthischapter,performingsteady-stateandtransientthermalanalysesinSimulationwillbecovered:

@#@,GeometryAssembliesSolidBodyContactHeatLoadsSolutionOptionsResultsandPostprocessingWorkshop6.1ThermalTransientSetupTransientSettingsTransientLoadsTransientResultsWorkshop6.2,ThecapabilitiesdescribedinthissectionaregenerallyapplicabletoANSYSDesignSpaceEntralicensesandabove,exceptforanANSYSStructurallicense.,TrainingManual,ThermalAnalysis,BasicsofSteady-StateHeatTransfer,Forasteady-state（static）thermalanalysisinSimulation,thetemperaturesTaresolvedforinthematrixbelow:

@#@Assumptions:

@#@Notransienteffectsareconsideredinasteady-stateanalysisKcanbeconstantorafunctionoftemperatureQcanbeconstantorafunctionoftemperatureANSYSWorkbenchSi,TrainingManual,ThermalAnalysis,BasicsofSteady-StateHeatTransfer,FouriersLawprovidesthebasisofthepreviousequation:

@#@Heatflowwithinasolid（FouriersLaw）isthebasisofKHeatflux,heatflowrate,andconvectionaretreatedasboundaryconditionsonthesystemQConvectionistreatedasaboundaryconditionalthoughtemperature-dependentfilmcoefficientsarepossibleItisimportanttoremembertheseassumptionsrelAaNteSdYtSoWorkbenchSiperformingthermalanalysesinSimulation.,ANSYSWorkbenchSi,TrainingManual,ThermalAnalysis,PhysicsFilters,Ifathermal-onlysolutionistobeperformedthePhysicsFiltercanbeusedtofiltertheGUIUnder“ViewmenuPhysicsFilter,”unselectthe“Structural”and“Electromagnetic”optionsThisappliestooptionsinthe“Environment”and“Solution”levelsonly,Ifathermal-stresssimulationistobeperformed,donotturn,offthestructuralphysicsfilter,TrainingManual,ThermalAnalysis,A.Geometry,Inthermalanalyses,alltypesofbodiessupportedbySimulationmaybeused.Solid,surface,andlinebodiesaresupportedForsurfacebodies,thicknessmustbeinputintheDetailsviewoftheGeometrybranchLinebodiecross-sectionandorientationisdefinedwithinDesignModeler,Cross-sectionandorientationinformationresultsinAaNnSYSWorkbenchSi,effectivethermalcross-sectionOnlytemperatureresultsareavailableforlinebodiesThe“PointMass”featureisnotavailableinthermalanalyses,TrainingManual,ThermalAnalysis,Geometry,Shellandlinebodyassumptions:

@#@Forshellbodiesthrough-thicknesstemperaturegradientsarenotavailable.ShellsassumetemperaturesontopandbottomofsurfacearethesameForlinebodiesthroughthicknessvariationinthetemperatureisnotavailable.Linebodiesassumethetemperatureisconstantacrossthecross-sectionTemperaturevariationwillstillbeconsideredalongthelinebodyANSYSWorkbenchSi,ANSYSWorkbenchSi,TrainingManual,ThermalAnalysis,MaterialProperties,ThermalConductivityisinputintheEngineeringDataapplicationTemperature-dependentthermalconductivityisinputasatable,Ifanytemperature-dependentmaterialpropertiesexist,thiswillresultinanonlinearsolution.,Theonlyrequiredmaterialpropertyisthermalconductivity,ANSYS,WorkbenchSi,TrainingManual,ThermalAnalysis,B.AssembliesSolidBodyContact,Whenimportingassembliesofsolidparts,contactregionsareautomaticallycreatedbetweenthesolidbodiesenablingheattransferbetweenpartsinanassembly,ModelshownisfromasampleInventorassembly.,TrainingManual,ThermalAnalysis,AssembliesContactRegionNoheatspreadingisconsideredinthecontact/targetinterface,HeatflowwithinthecontactregionisinthecontactnormaldirectiononlyHeatflowsonlyifatargetelementispresentinthenormaldirectionofacontactelement,Inthefigureontheleft,thesolid,greendouble-aArroNwsSinYdiScateWorkbenchSiheatflowwithinthecontactregion.Heatflowonlyoccursifatargetsurfaceisnormaltoacontactsurface.Thelight,dottedgreenarrowsindicatethatnoheattransferwilloccurbetweenparts.,TrainingManual,ThermalAnalysis,AssembliesContactRegion,Ifthepartsareinitiallyincontactheattransferwilloccurbetweentheparts.IfthepartsareinitiallyoutofcontactnoheattransfertakesplaceSummary:

@#@,ANSYSWorkbenchSiThepinballregiondetermineswhencontactoccursandisautomaticallydefinedandsettoarelativelysmallvaluetoaccommodatesmallgapsinthemodel,ANSYSWorkbench,Si,TrainingManual,ThermalAnalysis,AssembliesContactRegion,Ifthecontactisbondedornoseparation,thenheattransferwilloccur（solidgreenlines）whenthesurfacesarewithinthepinballradius,Inthisfigureontheright,thegapbetweenthetwopartsisbiggerthanthepinballregion,sonoheattransferwilloccurbetweentheparts,PinballRadius,ANSYSWorkbenchSi,TrainingManual,ThermalAnalysis,AssembliesThermalConductanceTheamountofheatflowbetweentwopartsisdefinedbythecontactheatfluxq:

@#@,whereTcontactisthetemperatureofacontact“node”a