ansys12.0官方培训手册-introductiontocfx-partd

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1、ANSYS12.0TrainingManualCFX12.0IntroductiontoCFXPartDChapter12-15,97PagesChapter12MovingZonesIntroductiontoCFXTopicsDomainMotionRotatingFluidDomainsSingleFrameofReferenceMultipleFramesofReferenceFrameChangeModelsPitchChangeMeshDefomationAppendixMovingSolidDomainsTranslationRotation

2、OverviewofMovingZonesManyengineeringproblemsinvolveflowsthroughdomainswhichcontainmovingcomponentsRotationalmotion:Flowthoughpropellers,axialturbineblades,radialpumpimpellers,etc.Translationalmotion:Trainmovinginatunnel,longitudinalsloshingoffluidinatank,etc.Generalrigid-bodymotionB

3、oathulls,etc.BoundarydeformationsFlapvalves,flexiblepipes,bloodvessels,etc.OverviewofMovingZonesThereareseveralmodelingapproachesformovingdomains:ForrotationalmotiontheequationsoffluidflowcanbesolvedinarotatingreferenceframeAdditionalaccelerationtermsareaddedtothemomentumequationsSo

4、lutionsbecomesteadywithrespecttotherotatingreferenceframeCancouplewithstationarydomainsthroughinterfacesSomelimitationsapply,asdiscussedbelowTranslationalmotioncanbesolvedbymovingthemeshasawholeInterfacescanbeusedtoallowdomainstoslidepasteachotherMoregeneralrigid-bodymotioncanbesolv

5、edusinga6-DOFsolvercombinedwithmeshmotion,ortheimmersedsolidapproachIfthedomainboundariesdeform,wecansolvetheequationsusingmeshmotiontechniquesDomainpositionandshapearefunctionsoftimeMeshdeformedusingsmoothing,dynamicmeshloadingorremeshingxDomainyMovingReferenceFrame–flowsolvedinaro

6、tatingcoordinatesystemMeshDeformation–DomainchangesshapeasafunctionoftimeRotatingReferenceFramesvs.MeshMotionRotatingReferenceFramesWhyusearotatingreferenceframe?FlowfieldwhichisunsteadywhenviewedinastationaryframecanbecomesteadywhenviewedinarotatingframeSteady-stateproblemsareeasie

7、rtosolve...SimplerBCsLowcomputationalcostEasiertopost-processandanalyzeNOTE:Youmaystillhaveunsteadinessintherotatingframeduetoturbulence,circumferentiallynon-uniformvariationsinflow,separation,etc.Example:vortexsheddingfromfanbladetrailingedgeCanemployrotationally-periodicboundaries

8、forefficiency(reduc