弹性支撑低质量比圆柱涡激振动数值模拟.pdf

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1、J．Marine．Sci．App](2009)8：237—245DOI：10．1007／s11804．009．8l17．xNumericalsimulationofVIVforanelasticcylindermountedonth’espri●ngsupportswi‘th-l-owmass-rati‘oxuJun．1ingandZHURen．qingSchoolofNavalArchitectureandOceanEngineering,JiangsuUniversityofScienceandTechnology,Zhenjiang212003，ChinaAb

2、stract：Withthedevelopmentoftheoffshoredeepwateroilindustrymanyresearchersarefocusingonthevortex—inducedvibrations(VIV)ofdeeprisers．Inthepresentwork。Reynolds—averagedNavier-Stokes(RANS1equationswerecombinedwithmeSST一turbulentmode1tosimulatethestream—wiseand~ansversemotionofanelastically

3、mountedcylinderwithalowmass—ratio．anatura1frequencyratioof／~／／y=1andanRenumberbetween5300and32000．Thefour-orderRunge—Kuttamethodwasappliedtosolvetheoscillatingequationofthecylinder．Therelationshipbet、veenreducedvelocityandparametersofthecylinder,includingtheliftcoeficient，thedragcoefic

4、ient，displacementandthevortexstructurewerethencomparedwithrecentexperimentalresultsanddiscussedindetail．ThepresentnlMnericalsimulationreproducedeffectshavebeenobservedinexperiments．suchasthelock—inphenomenon．thehystereticphenomenonandbeatingbehavior．Keywords：VIV：1owmassratio；stream．wis

5、eandtransversemotion；two-degree—of-freedom；vortexsheddingmodel；CFDcLCnumber：0327Documentcode：AArticleID：1671-9433(2009)03．0237一O91IntroductiondataforXY-motionwhere{：={，indicatingaslightincreaseintransverseamplitudeandashifltohigherUWiththedevelopmentofoilexplorationindeepwaters，forthep

6、eak仃ansverseresponse．whencomparedwiththemarineinfusionpipelinedesignrequirementsbecomeYmotioncase．Acomprehensivestudyontheresponseofhigherandhigher．Inordertoexplorethedamagetodeeparigid，elasticallymountedcylinderintwodegreesofriserbyvortex-inducedvibrationcausedbywaveandfreedomf2．DOF1w

7、aspresentedbyJauvtisandcurrent，theresearchershaveconductedalotofresearchWilliamson[4-5Jwork．withequivalentmassratiosandnaturalfrequenciesinbothdirectionsanda1owstructuraldamping．Form’1．04，however，thesystemresponseEarlythestudyonthevortex．inducedvibrationwasbasedonhighmassratiobecause