25198.頂張力立管流固耦合的渦激振動數(shù)值模擬

1、天津大學(xué)碩士學(xué)位論文頂張力立管流固耦合的渦激振動數(shù)值模擬姓名：樊娟娟申請學(xué)位級別：碩士專業(yè)：船舶與海洋工程指導(dǎo)教師：唐友剛201112ABSTRACTDeep—searisersareimportantpartsofdeepseaengineeringequipmentUnderthecomplexmarineenvironmentconditions，thevortex—inducedvibrationwilloccur)andthi

2、swillinducerisers’fatiguedamageAtpresent，VIVandfatigueresearchesofdeepsearisersareforefrontsubjectinmarinefieldsWi也theCFDmethod，viscousflowaroundcircularthesimulationsofForcedOscillatingCylinderathighamplituderatioandone

3、wayandtwowayfluidstructureinteractionⅥVarepresented，andtoptensionrisers’vortexinducedvibrationsissimulatedNavier—StokesequationiSsolvedbysoftwareFLUENTthe2Dand3DofViscousFlowaroundcirculararesimulated；Winlthedynamicmesho

4、fFluent，thesimulationSofForcedOscillatingCylinderathighamplituderatioispresentedCombiningthefluidequationandtherisers’movementequation，one。wayandtwowayfluidstructureinteractionVIVaresimulatedFinally，usingthetheoryofslice

5、，deepsearisers’3Dvortexinducedvibrationsaresimplified，throughtheCFDsoftwareandFEAsoftwareABAQUS，deep—searisers’3DFSIVIVissimulatedThroughthispaper，thelmcoefficientandvortexsheddingfrequencyareobtainedComparingbetweenther

6、esultsbasedonthe2Danalysisandthe3Danalysis，the3Dresultsaresmallerthanthe2DresultsWiththedynamicmeshofFluenLthesimulationSofForcedOscillatingCylinderathighamplituderatioispresentedThevariationofliftcoefficientandvortexshe

7、ddingfrequencyareobtained，the“l(fā)ockin”regionisgivenTheresultsofonewayandtwowayVIVsimulationshowthatlargerdampwillweakentheVIVlevel，andinthelowquality，smalldamping，longitudinalfreedomvortexinducedvibrationwillaggravatetran