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1、VPESwissWorkshopAcousticSimulation12.Sept.2013Fluid-StructureAcousticAnalysiswithBidirectionalCouplingandSoundTransmissionReinhardHelfrichINTESGmbH,Stuttgartinfo@intes.dewww.intes.de©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept
2、.2013Seite1©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite2Fluid-StructureAcoustics•Methodslikestructuraldynamics(vibrations)•Applicationforfluidsonly(Acoustics)andforstructurescoupledwithfluids(Fluid-StructureAcoustics
3、)•Extensionofclassicalstructuralmodelsbysurroundingfluidmodelsusingastrongcoupling•Thecouplingisperformedphysically,i.e.thenormaldisplacementofthestructureisidenticaltothenormaldisplacementofthefluid©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcoustic
4、Simulation12.Sept.2013Seite3ExampleforFluid-StructureAcousticsExternalfluidStructureDoublywettedshellelementsHullInternalfluid©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite4FluidModelwithFiniteElements©INTESGmbH,2013,S
5、tuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite5CouplingofStructureandFluid•Fluidmeshandstructuralmeshareusuallynotcompatible.Reasons:Fluid•FluidandstructurearemeshedIncompatibleindependentlymeshes•StructuralmeshesareusuallymuchCoupling
6、finerthanthecoupledfluidmeshdueelementstodifferentsoundvelocitiesSolid•Incompatiblemeshesasstandardfeaturearesolvingthedifferentrequirements©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite6SoundRadiationAnechoicboundarie
7、saremodeledbyradiationboundaryconditionelements,e.g.sphericalboundariesfollowingBayliss-TurkelRadiationboundaryconditionFluidmeshStructureassoundsource©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite7SurfaceWavesSurfacew
8、avesMode1at0.599HzFluidelementsMode2at0.886HzMode3at0.886Hz©INTESGmbH,2013,Stuttgart,GermanyVPWSwissWorkshopAcousticSimulation12.Sept.2013Seite8AddedMass•Itisfrequentlysufficientforstructuraldynamicanalysisto
