气动噪音仿真(fluent)

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1、Tutorial:ModelingFlow-Induced(Aeroacoustic)NoiseProblemsUsingFLUENTIntroductionThistutorialdemonstrateshowtomodel2Dturbulentflowacrossacircularcylinderusinglargeeddysimulation(LES)andcomputeflow-induced(aeroacoustic)noiseusingFLUENT’sacousticsmodel.Youwilllearnhowto:•Performa2Dlargeeddysimula

2、tion.•Setparametersforanaeroacousticcalculation.•Saveacousticsourcedataforanacousticcalculation.•Calculateacousticpressuresignals.•Postprocessaeroacousticresults.PrerequisitesThistutorialassumesthatyouarefamiliarwiththeFLUENTinterfaceandthatyouhaveagoodunderstandingofbasicsetupandsolutionpr

3、ocedures.Somestepswillnotbeshownexplicitly.Inthistutorialyouwillusetheacousticsmodel.Ifyouhavenotusedthisfeaturebefore,firstreadChapter21,PredictingAerodynamicallyGeneratedNoise,oftheFLUENT6.2User’sGuidecFluentInc.May11,20051ModelingFlow-Induced(Aeroacoustic)NoiseProblemsUsingFLUENTProblemDe

4、scriptionTheproblemconsidersturbulentairflowovera2Dcircularcylinderatafreestreamve-locity(U)of69.2m/s.Thecylinderdiameter(D)is1.9cm.TheReynoldsnumberbasedonthediameteris90,000.Thecomputationaldomain(Figure1)extends5Dupstreamand20Ddownstreamofthecylinder.U=69.2m/sD=1.9cmFigure1:ComputationalD

5、omainPreparation1.Copythefilecylinder2d.mshtoyourworkingdirectory.2.Startthe2DversionofFLUENT.Approximately2.5hoursofCPUtimeisrequiredtocompletethistutorial.Ifyouareinterestedexclusivelyinlearninghowtosetuptheacousticsmodel,youcanreducethecomputingtimerequirementsconsiderablybystartingatStep

6、7andusingtheprovidedcaseanddatafiles.2cFluentInc.May11,2005ModelingFlow-Induced(Aeroacoustic)NoiseProblemsUsingFLUENTStep1:Grid1.Readthegridfilecylinder2d.msh.File−→Read−→Case...AsFLUENTreadsthegridfile,itwillreportitsprogressintheconsolewindow.Sincethegridforthistutorialwascreatedinmeters,the

7、reisnoneedtorescalethegrid.Checkthatthedomainextendsinthex-directionfrom-0.095mto0.38m.2.Checkthegrid.Grid−→CheckFLUENTwillperformvariouschecksonthemeshandwillreporttheprogressintheconsolewindow.Payparticularattentiontothereportedminimumvolume.Makesureth