fluent 学习资料 laminar pipe flow

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1、ProblemSpecification1.CreateGeometryinGAMBIT2.MeshGeometryinGAMBIT3.SpecifyBoundaryTypesinGAMBIT4.SetUpProbleminFLUENT5.Solve!6.AnalyzeResults7.RefineMeshProblem1Problem2LaminarPipeFlowProblemSpecificationConsiderfluidflowingthroughacircularpipeofcontantcross

2、-section.ThepipediameterD=0.2mandlengthL=8m.TheinletvelocityVin=1m/s.Considerthevelocitytobeconstantovertheinletcross-section.Thefluidexhaustsintotheambientatmospherewhichisatapressureof1atm.Takedensityρ=1kg/m3andcoefficientofviscosityµ=2x10-3kg/(ms).TheReyno

3、ldsnumberRebasedonthepipediameteriswhereVavgistheaveragevelocityattheinlet,whichis1m/sinthiscase.SolvethisproblemusingFLUENT.Plotthecenterlinevelocity,wallskin-frictioncoefficient,andvelocityprofileattheoutlet.Validateyourresults.Note:Thevaluesusedfortheinlet

4、velocityandflowpropertiesarechosenforconvenienceratherthantoreflectreality.ThekeyparametervaluetofocusonistheReynoldsno.PreliminaryAnalysisWeexpecttheviscousboundarylayertogrowalongthepipestartingattheinlet.Itwilleventuallygrowtofillthepipecompletely(provided

5、thatthepipeislongenough).Whenthishappens,theflowbecomesfully-developedandthereisnovariationofthevelocityprofileintheaxialdirection,x(seefigurebelow).Onecanobtainaclosed-formsolutiontothegoverningequationsinthefully-developedregion.YoushouldhaveseenthisintheIn

6、troductiontoFluidMechanicscourse.Wewillcomparethenumericalresultsinthefully-developedregionwiththecorrespondinganalyticalresults.Soit'sagoodideaforyoutogobacktoyourtextbookintheIntrocourseandreviewthefully-developedflowanalysis.Whatarethevaluesofcenterlinevel

7、ocityandfrictionfactoryouexpectinthefully-developedregionbasedontheanalyticalsolution?Whatisthesolutionforthevelocityprofile?We'llcreatethegeometryandmeshinGAMBITwhichisthepreprocessorforFLUENT,andthenreadthemeshintoFLUENTandsolvefortheflowsolution.GotoStep1:

8、CreateGeometryinGAMBITStep1:CreateGeometryinGAMBITStrategyforCreatingGeometryInordertocreatetherectangle,wewillfirstcreatetheverticesatthefourcorners.We'llthenjoinadjacentverticesbystraig