穩(wěn)態(tài)熱分析案例ANSYS10版

1、Pipe:4-Ofldo=10iQJIcimensionsrijnc*ies<Tankq=264=30Cuioutportonw<|bemodeJed本例題的主要部分為一個圓筒形罐，具上沿徑向有一材料一樣的接管(如圖？所所示)，缶(內(nèi)流動著4500F(232C)的高溫流體，接管內(nèi)流動著100°F(380C)的低溫流體，兩個流體區(qū)域由薄壁管隔離。罐的對流換熱系數(shù)為250Btu/hr-ft2-oF(1420watts/m2-°K),接管的對流換熱系數(shù)隨管壁溫度而變，它的熱物理性能如表？所示。要求計算罐與接管的溫度分布。表？溫度70200300400500°

2、F密度0.2850.2850.2850.2850.285lb/in3導(dǎo)熱系數(shù)8.358.909.359.810.23Btu/hr-ft-oF比熱0.1130.1170.1190.1220.125Btu/lb-oF對流換熱系數(shù)426405352275221Btu/hr-ft2-oF6.5.1預(yù)處理Step1:確定分析標(biāo)題起動ANSYS后，開始一個分析，需要輸入一個標(biāo)題，按下面方法進(jìn)行操作：1 .選擇UtilityMenu>File>ChangeTitle,彈出相應(yīng)對話框2 .輸入Steady-statethermalanalysisofpipejunction3 .點(diǎn)擊OK。Step

3、2:設(shè)置分析單位系統(tǒng)Youneedtospecifyunitsofmeasurementfortheanalysis.Forthispipejunctionexample,measurementsusetheU.S.Customarysystemofunits(basedoninches).Tospecifythis,typethecommand/UNITS,BINintheANSYSInputwindowandpressENTER在分析之前，需要為分析系統(tǒng)設(shè)定單位系統(tǒng)，Step3:DefinetheElementTypeTheexampleanalysisusesathermalsolide

4、lement.Todefineit,dothefollowing:1. ChooseMainMenu>Preprocessor>ElementType>Add/Edit/DeleteTheElementTypesdialogboxappears.2. ClickonAdd.TheLibraryofElementTypesdialogboxappears.3. Inthelistontheleft,scrolldownandpick(highlight)"ThermalSolid."Inthelistontheright,pick"Brick20n

5、ode90."4. ClickonOK.5. ClickonClosetoclosetheElementTypesdialogbox.Step4:DefineMaterialPropertiesTodefinematerialpropertiesfortheanalysis,performthesesteps:1. ChooseMainMenu>Preprocessor>MaterialProps>MaterialModels.TheDefineMaterialModelBehaviordialogboxappears.2. IntheMaterialModelsA

6、vailablewindow,double-clickonthefollowingoptions:Thermal,Density.Adialogboxappears.3. Enter.285forDENS(Density),andclickonOK.MaterialModelNumber1appearsintheMaterialModelsDefinedwindowontheleft.4. IntheMaterialModelsAvailablewindow,double-clickonthefollowingoptions:Conductivity,Isotropic.Adialogboxa

7、ppears.5. ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.6. IntheT1throughT5fields,enterthefollowingtemperaturevalues:70,200,300,400,and500.Selecttherowoftemperaturesbydraggingthecursoracrossthetextfields.ThencopythetemperaturesbypressingCtrl-c.7. IntheKXX(ThermalConductivity)fields,ent

8、erthefollowingvalues,inorder,foreachofthetemperatures,thenclickonOK.Notethattokeeptheunitsconsistent,eachofthegivenvaluesofKXXmustbedividedby12.YoucanjustinputthefractionsandhaveANSYSperformthecalculations.8.35/128.90/129.35/129.80/1210.23/128. IntheMaterialModelsAvailablewindow,double-clickonSpecif

9、icHeat.Adialogboxappears.9. ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.10. WiththecursorpositionedintheT1field,pastethefivetemperaturesbypressingCtrl-v.11. IntheC(SpecificHeat)fields,enterthefollowingvalues,inorder,foreachofthetemperatures,thenclickonOK.22.12512. Choose

10、menupathMaterial>NewModel,thenenter2forthenewMaterialID.ClickonOK.MaterialModelNumber2appearsintheMaterialModelsDefinedwindowontheleft.13. IntheMaterialModelsAvailablewindow,double-clickonConvectionorFilmCoef.Adialogboxappears.14. ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.15. Wi

11、ththecursorpositionedintheT1field,pastethefivetemperaturesbypressingCtrl-v.16. IntheHF(FilmCoefficient)fields,enterthefollowingvalues,inorder,foreachofthetemperatures.Tokeeptheunitsconsistent,eachvalueofHFmustbedividedby144.Asinstep7,youcaninputthedataasfractionsandletANSYSperformthecalculations.426

12、/144405/144352/144275/144221/14417. ClickontheGraphbuttontoviewagraphofFilmCoefficientsvs.temperature,thenclickonOK.18. ChoosemenupathMaterial>ExittoremovetheDefineMaterialModelBehaviordialogbox.19. ClickonSAVE_DBontheANSYSToolbar.Step5:DefineParametersforModeling1. ChooseUtilityMenu>Parameter

13、s>ScalarParameters.TheScalarParameterswindowappears.2. Inthewindow'sSelectionfield,enterthevaluesshownbelow.(Donotenterthetextinparentheses.)PressENTERaftertypingineachvalue.Ifyoumakeamistake,simplyretypethelinecontainingtheerror.RI1=1.3(Insideradiusofthecylindricaltank)RO1=1.5(Outsideradiuso

14、fthetank)Z1=2(Lengthofthetank)RI2=.4(Insideradiusofthepipe)RO2=.5(Outsideradiusofthepipe)Z2=2(Lengthofthepipe)3. ClickonClosetoclosethewindow.Step6:CreatetheTankandPipeGeometry1. ChooseMainMenu>Preprocessor>Modeling>Create>Volumes>Cylinder>ByDimensionsTheCreateCylinderbyDimensionsd

15、ialogboxappears.2. Setthe"Outerradius"fieldtoRO1,the"Optionalinnerradius"fieldtoRI1,the"Zcoordinates"fieldsto0andZ1respectively,andthe"Endingangle"fieldto90.3. ClickonOK.4. ChooseUtilityMenu>WorkPlane>OffsetWPbyIncrements.TheOffsetWPdialogboxappears.5. S

16、etthe"XY,YZ,ZXAngles"fieldto0,-90.6. ClickonOK.7. ChooseMainMenu>Preprocessor>Modeling>Create>Volumes>Cylinder>ByDimensionsTheCreateCylinderbyDimensionsdialogboxappears.8. Setthe"Outerradius"fieldtoRO2,the"Optionalinnerradius"fieldtoRI2,the"Zcoord

17、inates"fieldsto0andZ2respectively.Setthe"Startingangle"fieldto-90andthe"EndingAngle"to0.9. ClickonOK.10. ChooseUtilityMenu>WorkPlane>AlignWPwith>GlobalCartesian.Step7:OverlaptheCylinders1. ChooseMainMenu>Preprocessor>Modeling>Operate>Booleans>Overlap&

18、gt;VolumesTheOverlapVolumespickingmenuappears.2. ClickonPickAll.Step8:ReviewtheResultingModelBeforeyoucontinuewiththeanalysis,quicklyreviewyourmodel.Todoso,followthesesteps:1. ChooseUtilityMenu>PlotCtrls>Numbering.ThePlotNumberingControlsdialogboxappears.2. ClicktheVolumenumbersradiobuttontoOn

19、,thenclickonOK.3. ChooseUtilityMenu>PlotCtrls>ViewSettings>ViewingDirection.Adialogboxappears.4. Setthe"Coordsofviewpoint"fieldsto(-3,-1,1),thenclickonOK.5. Reviewtheresultingmodel.6. ClickonSAVE_DBontheANSYSToolbar.Step9:TrimOffExcessVolumesInthisstep,deletetheoverlappingedgesoft

20、hetankandthelowerportionofthepipe.1. ChooseMainMenu>Preprocessor>Modeling>Delete>VolumeandBelow.TheDeleteVolumeandBelowpickingmenuappears.2. Inthepickingmenu,type3,4andpresstheENTERkey.ThenclickonOKintheDeleteVolumeandBelowpickingmenu.Step10:CreateComponentAREMOTEInthisstep,youselectthea

21、reasattheremoteYandZedgesofthetankandsavethemasacomponentcalledAREMOTE.Todoso,performthesetasks:1. ChooseUtilityMenu>Select>Entities.TheSelectEntitiesdialogboxappears.2. Inthetopdropdownmenu,selectAreas.Intheseconddropdownmenu,selectByLocation.ClickontheZCoordinatesradiobutton.3. Setthe"M

22、in,Max"fieldtoZ1.4. ClickonApply.5. ClickontheYCoordinatesandAlsoSeleradiobuttons.6. Setthe"Min,Max"fieldto0.7. ClickonOK.8. ChooseUtilityMenu>Select>Comp/Assembly>CreateComponentTheCreateComponentdialogboxappears.9. Setthe"Componentname"fieldtoAREMOTE.Inthe"Co

23、mponentismadeof"menu,selectAreas.10. ClickonOK.Step11:OverlayLinesonTopofAreasDothefollowing:1. ChooseUtilityMenu>PlotCtrls>Numbering.ThePlotNumberingControlsdialogboxappears.2. ClicktheAreaandLinenumberradioboxestoOnandclickonOK.3. ChooseUtilityMenu>Plot>Areas.4. ChooseUtilityMenu&

24、gt;PlotCtrls>EraseOptions.5. Set"ErasebetweenPlots"radiobuttontoOff.6. ChooseUtilityMenu>Plot>Lines.7. ChooseUtilityMenu>PlotCtrls>EraseOptions.8. Set"ErasebetweenPlots"radiobuttontoOn.Step12:ConcatenateAreasandLinesInthisstep,youconcatenateareasandlinesattheremote

25、edgesofthetankformappedmeshing.Todoso,followthesesteps:1. ChooseMainMenu>Preprocessor>Meshing>Mesh>Volumes>Mapped>Concatenate>AreasTheConcatenateAreaspickingmenuappears.2. ClickonPickAll.3. ChooseMainMenu>Preprocessor>Meshing>Mesh>Volumes>Mapped>Concatenate>

26、LinesApickingmenuappears.4. Pick(clickon)lines12and7(orenterinthepicker).5. ClickonApply.6. Picklines10and5(orenterinpicker).7. ClickonOK.Step13:SetMeshingDensityAlongLines1. ChooseMainMenu>Preprocessor>Meshing>SizeCntrls>ManualSize>Lines>PickedLinesTheElementSizeonPickedLinespicki

27、ngmenuappears.2. Picklines6and20(orenterinthepicker).3. ClickonOK.TheElementSizesonPickedLinesdialogboxappears.4. Setthe"No.ofelementdivisions"fieldto4.5. ClickonOK.6. ChooseMainMenu>Preprocessor>Meshing>SizeCntrls>ManualSize>Lines>PickedLinesApickingmenuappears.7. Pickli

28、ne40(orenterinthepicker)8. ClickonOK.TheElementSizesonPickedLinesdialogboxappears.9. Setthe"No.ofelementdivisions"fieldto6.10. ClickonOK.Step14:MeshtheModelInthissequenceofsteps,yousettheglobalelementsize,setmappedmeshing,thenmeshthevolumes.1. ChooseUtilityMenu>Select>Everything.2. C

29、hooseMainMenu>Preprocessor>Meshing>SizeCntrls>ManualSize>Global>SizeTheGlobalElementSizesdialogboxappears.3. Setthe"Elementedgelength"fieldto0.4andclickonOK.4. ChooseMainMenu>Preprocessor>Meshing>MesherOptsTheMesherOptionsdialogboxappears.5. SettheMesherTyperadio

30、buttontoMappedandclickonOK.TheSetElementShapedialogboxappears.6. Inthe2-Dshapekeydropdownmenu,selectQuadandclickonOK.7. ClickontheSAVEDBbuttonontheToolbar.8. ChooseMainMenu>Preprocessor>Meshing>Mesh>Volumes>Mapped>4to6sidedTheMeshVolumespickingmenuappears.ClickonPickAll.IntheGraphi

31、cswindow,ANSYSbuildsthemeshedmodel.Ifashapetestingwarningmessageappears,reviewitandclickClose.Step15:TurnOffNumberingandDisplayElements1. ChooseUtilityMenu>PlotCtrls>Numbering.ThePlotNumberingControlsdialogboxappears.2. SettheLine,Area,andVolumenumberingradiobuttonstoOff.3. ClickonOK.Step16:De

32、finetheSolutionTypeandOptionsInthisstep,youtellANSYSthatyouwantasteady-statesolutionthatusesaprogram-chosenNewton-Raphsonoption.1. ChooseMainMenu>Solution>AnalysisType>NewAnalysisTheNewAnalysisdialogboxappears.2. ClickonOKtochoosethedefaultanalysistype(Steady-state).3. ChooseMainMenu>Sol

33、ution>AnalysisType>AnalysisOptionsTheStaticorSteady-Statedialogboxappears.4. ClickonOKtoacceptthedefault(-ch(oPaengraimfor"NewtGRaphsonoption."Step17:SetUniformStartingTemperatureInathermalanalysis,setastartingtemperature.1. ChooseMainMenu>Solution>DefineLoads>Apply>Therm

34、al>Temperature>UniformTemp.Adialogboxappears.2. Enter450for"Uniformtemperature."ClickonOK.Step18:ApplyConvectionLoadsThisstepappliesconvectionloadstothenodesontheinnersurfaceofthetank.1. ChooseUtilityMenu>WorkPlane>ChangeActiveCSto>GlobalCylindrical.2. ChooseUtilityMenu>S

35、elect>Entities.TheSelectEntitiesdialogboxappears.3. SelectNodesandByLocation,andclickontheXCoordinatesandFromFullradiobuttons.4. Setthe"Min,Max"fieldtoRI1andclickonOK.5. ChooseMainMenu>Solution>DefineLoads>Apply>Thermal>Convection>OnNodesTheApplyCONVonNodespickingmenua

36、ppears.6. ClickonPickAll.TheApplyCONVonNodesdialogboxappears.7. Setthe"Filmcoefficient"fieldto250/144.8. Setthe"Bulktemperature"fieldto450.9. ClickonOK.Step19:ApplyTemperatureConstraintstoAREMOTEComponent1. ChooseUtilityMenu>Select>Comp/Assembly>SelectComp/AssembJyAdialo

37、gboxappears.2. ClickonOKtoselectcomponentAREMOTE.3. ChooseUtilityMenu>Select>Entities.TheSelectEntitiesdialogboxappears.4. SelectNodesandAttachedTo,andclickontheAreas,Allradiobutton.ClickonOK.5. ChooseMainMenu>Solution>DefineLoads>Apply>Thermal>Temperature>OnNodesTheApplyTEMP

38、onNodespickingmenuappears.6. ClickonPickAll.Adialogboxappears.7. Setthe"LoadTEMPvalue"fieldto450.8. ClickonOK.9. ClickonSAVE_DBontheANSYSToolbar.Step20:ApplyTemperature-DependentConvectionInthisstep,applyatemperature-dependentconvectionloadontheinnersurfaceofthepipe.1. ChooseUtilityMenu>

39、;WorkPlane>OffsetWPbyIncrements.Adialogboxappears.2. Setthe"XY,YZ,ZXAngles"fieldto0,-90,thenclickonOK.3. ChooseUtilityMenu>WorkPlane>LocalCoordinateSystems>CreateLocalCS>AtWPOrigin.TheCreateLocalCSatWPOrigindialogboxappears.4. Onthe"Typeofcoordinatesystem"menu,sele

40、ct"Cylindrical1"andclickonOK.5. ChooseUtilityMenu>Select>Entities.TheSelectEntitiesdialogboxappears.6. SelectNodes,andByLocation,andclickontheXCoordinatesradiobutton.7. Setthe"Min,Max"fieldtoRI2.8. ClickonOK.9. ChooseMainMenu>Solution>DefineLoads>Apply>Thermal&g

41、t;Convection>OnNodesTheApplyCONVonNodespickingmenuappears.10. ClickonPickAll.Adialogboxappears.11. Setthe"Filmcoefficient"fieldto-2.12. Setthe"Bulktemperature"fieldto100.13. ClickonOK.14. ChooseUtilityMenu>Select>Everything.15. ChooseUtilityMenu>PlotCtrls>Symbols.T

42、heSymbolsdialogboxappears.16. Onthe"Showpresandconvectas"menu,selectArrows,thenclickonOK.17. ChooseUtilityMenu>Plot>Nodes.ThedisplayintheGraphicsWindowchangestoshowyouaplotofnodes.Step21:ResettheWorkingPlaneandCoordinates1. ToresettheworkingplaneanddefaultCartesiancoordinatesystem,ch

43、ooseUtilityMenu>WorkPlane>ChangeActiveCSto>GlobalCartesian.2. ChooseUtilityMenu>WorkPlane>AlignWPWith>GlobalCartesian.Step22:SetLoadStepOptionsForthisexampleanalysis,youneedtospecify50substepswithautomatictimestepping.1. ChooseMainMenu>Solution>LoadStepOptions>Time/Frequen

44、c>TimeandSubstpsTheTimeandSubstepOptionsdialogboxappears.2. Setthe"Numberofsubsteps"fieldto50.3. Set"Automatictimestepping"radiobuttontoOn.4. ClickonOK.Step23:SolvetheModel1. ChooseMainMenu>Solution>Solve>CurrentLS.TheANSYSprogramdisplaysasummaryofthesolutionoptionsina/STATcommandwindow.2. Reviewthesummary.3. ChooseClosetoclosethe/STATcommandwindow.4. ClickonOKintheSolveCurrentLoadStepdialogbox.5. ClickYesintheVerifymessagewindow.6. Thesolutionruns.WhentheSolutionisdone!windowappears,clickonClose.Step24:ReviewtheNodalTemperatureResults1. ChooseUtilit