大涡模拟的fluent算例.pdf

《大涡模拟的fluent算例.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、Chapter3.Aero-NoisePredictionofFlowAcrossaCircularCylinderIntroduction:Thistutorialdemonstrateshowtomodelthe2Dturbu-lentflowacrossacircularcylinderusingLES(LargeEddySimula-tion),andcomputeflow-inducednoise(aero-noise)usingFLUENT'sacousticsmodel.Inthistutorialyouwilllearnhow

2、to:Perform2DLargeEddySimulation(LES)Setparametersforanaero-noisecalculationSavesurfacepressuredataforanaero-noisecalculationCalculateaero-noisequantitiesPostprocessanaero-noisesolutionPrerequisites:ThistutorialassumesthatyouarefamiliarwiththemenustructureinFLUENT,and

3、thatyouhavesolvedorreadTu-torial1.Somestepsinthesetupandsolutionprocedurewillnotbeshownexplicitly.ProblemDescription:Theproblemconsidersturbulentairflowovera2DcircularcylinderatafreestreamvelocityUof69:19m=s.ThecylinderdiameterDis1:9cm.TheReynoldsnumberbasedontheflowparamet

4、ersisabout90000.Thecomputationaldo-main(Figure3.0.1)extends5Dupstreamand20Ddownstreamofthecylinder,and5Donbothsidesofit.Ifthecomputationaldomainisnottakenwideenoughonthedownstreamside,sothatnoreversedflowoccurs,theaccuracyoftheaero-noisepredictionmaybeaected.Theruleofthum

5、bistotakeatleast20Donthedownstreamsideoftheobstacle.cFluentInc.June20,20023-1Aero-NoisePredictionofFlowAcrossaCircularCylinderFigure3.0.1:ComputationalDomainPreparation1.Copythelenoise/cyl_noise.mshfromtheFLUENTdocumen-tationCDtoyourworkingdirectory(asdescribedinTutorial

6、1).2.Startthe2DversionofFLUENT.3-2cFluentInc.June20,2002Aero-NoisePredictionofFlowAcrossaCircularCylinderStep1:Grid1.Readthegridlecylnoise.msh.File−!Read−!Case...AsFLUENTreadsthegridle,itwillreportitsprogressintheconsolewindow.2.Checkthegrid.Grid−!CheckFLUENTwillperform

7、variouschecksonthemeshandwillreporttheprogressintheconsolewindow.Payparticularattentiontothereportedminimumvolume.Makesurethisisapositivenumber.3.Scalethegrid.Grid−!Scale...(a)UnderUnitsConversion,selectcmintheGridWasCreatedindrop-downlist.(b)ClickonScale.4.Displaythegrid

8、.Display−!Grid...(a)Displaythegridwiththedefaultsettings(Figure3.0.2).(b)Usethemiddlemousebutton