w3heattransferthermalstresskwWord格式.docx

w3heattransferthermalstresskwWord格式.docx

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∙Understandtheinputandoutputforasteady-stateandatransientheattransferanalysis.

∙Useanamplitudespecificationforloading.

∙Understandtheprocedureforwritingtemperaturestotheresults（.fil）fileandreadingthosetemperaturesintoastressanalysis.

∙Understandhowusersubroutinesareused（optional）.

Problemdescription

Thephysicalproblemisasquaretubewithacircularhole.Thetubeissurroundedbyafluid,andtheholeisfilledwithanotherfluid.Thetwo-dimensionalfiniteelementmodelwillcontainonlyaone-eighthsectorofthetube,asshowninFigureW3–1.Thethermalpropertiesofthetubearegivenbelow:

∙Thermalpropertiesofthetube:

Specificheat=485.7N·

m/kg·

°

C

Density=7833.0kg/m3

Conductivity=11.19W/m·

FigureW3–1Squaretubewithcircularhole.

Steady-stateheattransferanalysis

AppliedTemperatures

Wewillstartwithananalysisinwhichthefluidtemperaturesareapplieddirectlytothenodesoftheinnerandouterwallsofthetube.Thisapproachimpliesthatthefluidstouchingthewallsareinfiniteheatsinks.

1.Entertheworkingdirectoryforthisworkshop:

../heat_transfer/keywords/workshop3

andviewthecontentsoffilet-sstemp.inpinatexteditor.

2.Submittheinputfilet-sstemp.inp.

3.Afterthejobcompletes,startanABAQUS/Viewersessionandopen

t-sstemp.odb.Theundeformedmodelshapeisplottedbydefault.

4.UsetheResultsTreetodeterminethelocationsofthedifferentnodeandelementsets.

a.IntheResultsTree,expandtheElementSetsandNodeSetscontainersunderneaththeoutputdatabasenamedt-sstemp.odb.

b.Selectdifferentsets;

thecorrespondingsetswillbehighlightedintheviewport.

c.Onceyouarefamiliarwiththelocationsofthedifferentsets,collapsethecontainers.

Onlyone-eighthofthecross-sectionneedstobemodeledbecauseofsymmetry.

QuestionW3–1:

Whatshouldtheboundaryconditionsbeatthosesymmetrylines?

Whataretheappliedboundaryconditionsinthemodel?

Thinkaboutthedifferencebetweenenforcingsymmetryforathermalboundaryascomparedtothatforadisplacementboundary.

5.Createacontourplotofthetemperature（variableNT11）.Theprocedureisprovidedbelow.Checkthecontourlinesatthesymmetrylines.Thecontourlinesshouldbenormaltotheedgeifthesymmetryconditionsarecorrectlyenforced.

d.Fromthemainmenubar,selectResultFieldOutput.

e.IntheFieldOutputdialogbox,selectNT11（nodaltemperature）astheprimaryvariable.ClickOK.

f.IntheSelectPlotStatedialogbox,chooseContourandclickOK.

Filmcoefficients（forsurfaceconvection）

Theinterfacebetweenthetubeandthefluidscanbemodeledmorerealisticallybydefiningfilmcoefficientsandsinktemperatures.

6.Copyt-sstemp.inptoafilecalledt-ssfilm.inp.

7.Modifyt-ssfilm.inpbygivingthestepanewtitleandremovingtheoptionthatappliestemperaturestotheinnerandouterwalls.

8.Adda*FILMoptiontothehistorysectionwiththefollowingtwolines:

*FILM

INWL,F4,400.,1500.

Thisfilmdefinitionspecifiesasinktemperatureof400°

Candafilmcoefficientof1500 

W/m2·

C,appliedtotheelementssurroundingtheroundhole（set=INWL）.ThefilmtypeF4appliesthefilmtoelementface4.ThefacenumberisbasedontheelementconnectivityandisdocumentedintheelementlibrarysectionoftheUser’sManual.Forplanarquadsthefacesarenumberedasshownatright:

Allelement-baseddistributedloadsareappliedtoelementfacesinasimilarmanner.Alternatively,surface-baseddistributedloadsmaybeusedtoapplydistributedloadstopredefinedsurfaces（e.g.,*SFILM）.

9.Youalsoneedtoapplyafilmdefinitiontotherightedgeofthemodel.TheelementsetOUTWLalreadygroupstheelementsalongtheedge.Tofindtheelementface,runadatacheckanalysisoft-sstemp.inpandeitherlookfortheelementconnectivityint-sstemp.dat（lookforthestring“ELEM”）ordothefollowinginABAQUS/Viewer（recommended）:

g.Opent-sstemp.odbinABAQUS/Viewer.Theundeformedmodelshapeisplottedbydefault.

h.UsetheResultsTreetolimitthedisplaytoelementsetPART-1-1.OUTWL.

i.Inthetoolbox,clicktheCommonOptionstool

.

j.IntheCommonPlotOptionsdialogbox,clicktheLabelstabandtoggleonShowelementlabelsandShowfacelabels.

k.ClickOK.

10.Withtheinformationobtainedinthepreviousstep,addanadditionaldatalinetothe*FILMoptiondefinedabovethatspecifiesafilmdefinitionfortherightedge.Giveasin