module b-turbulent pipe flowdocx：模块b-turbulent管flowdocx

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1、ModuleB:TurbulentPipeFlowSummary……………………………………………………ProblemStatement…………………………………………GeometryCreation…………………………………………MeshCreation……………………………………………...ProblemSetup………………………………………………Solution…………………………………………………….Results……………………...……………………………...PostProcessing…

2、………………………………………….Validation………………………………………………….Structuredvs.UnstructuredMesh…………………………Summary:Theturbulentpipeflowlearningmodulehasthreemainobjectives.Firsttheuserlearnshowtomodelasimplepipein2Dunderaxisymmetricconsiderations.Thenmeshingthemodelisshowcas

3、edasitrelatestoturbulentflow—theuserlearnshowtoapplybiastothemeshing.SecondproperproblemsetupisintroducedinANSYSFLUENTwhichinvolvessettingtheinitialconditionsandboundaryconditions,checkingforconvergenceandobtainingdata.Thirdtheuserlearnshowtoproperlyvali

4、datetheobtaineddatainordertomakesurethedataiscorrectandmakessense.Validationisextremelyimportantbecauseiftheuserinputthewrongparametersandspecifications,theFLUENToutputisalsogoingtobeincorrect.Extensiveanalysishasbeenperfomedontheobtaineddatafortheturbul

5、entpipeflow.Ithasbeenobservedthatwhilerefiningthestructuredmeshwillnothaveasignificantimpactontheresultsitisimportantforthatmeshtobestructuredotherwiseerroneousresultswillbeobtained.Ithasalsobeendocumentedthatmoreaccurateresultsareobtainedforak-eturbulen

6、tmodelwithnear-walltreatmentspecifiedasenhancedwalltreatmentasopposedtostandardwallfunctions.Turublentflowisvalidatedbycomparingwithexperimentaldata,i.e.skinfriction,velocityprofileandentrylength.Theimportantstepstakenincreatingthebiasedmesh,settingupthe

7、problemproperlyandobtainingmeaningfulvalidationcanthenbeusedasabasisforsolvingmorecomplicatedflowproblems.46

8、PageProblemStatement:VinletCenterLine·Atypicalpipewithgivenparameters:ρ=1.0kgm3;Vinlet=1ms;μ=2*10-5kgm*sD=0.2mL=8mFig.B.1Wall·Ifweanalyzeasmallel

9、ementfromthepipe,thatelementwillhavearectangularshape.Sincewearedealingwithanaxisymmetricflowtheproblemcanbefurthersimplifiedbyfocusingonlyontheradiusoftheshape.OutletVinletD/2CenterLineLFig.B.2·Thetypeofflowcanbedetermine