多浮体水动力干扰研究

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1、上海交通大学硕士学位论文INVESTIGATIONONHYDRODYNAMICINTERACTIONBETWEENMULTIPLEFLOATINGBODIESABSTRACTWiththecontinuousdevelopmentofglobaleconomy,thedemandforoilandgasresourcesescalates.Theexploitationofoffshoreoilandgasgraduallymovestodeepwater,whichcontributestothedevelopmentofvariousoffshoreplatformsandco

2、rrespondingoffshoreoperations.Manynewlyemergedfacilitiesandoperationsconsistofmultiplefloatingbodies.Examplesincludetwo-bargefloat-overinstallationoftheplatformtopsideandFLNG(FloatingLiquefiedNaturalGas)offloading.Hydrodynamicinteractionbetweenmultiplebodiesisaverycomplexproblemandgreatlyaffec

3、tsthemotionresponsesandwaveforcesofthebodies,andunderstandingitisparticularlysignificantforsafeoperationsinpracticalengineering.Inthisthesis,hydrodynamicinteractionbetweentwoside-by-sideidenticalbargesinafloat-overinstallationisinvestigatedusingvarioustheoriesandresearchmethods,includingnumeri

4、calsimulationbasedontheconventionalpotentialflowtheoryandviscousflowtheory,modelteststudy,andthedampinglidmethodbasedonfairlyperfectfluid.Thehydrodynamicresonanceandfluidflowaroundthetwobargesaremainlydiscussed.Thehydrodynamicperformancesofthetwoside-by-sidebargeswitha3-mgaparefirstinvestigate

5、dthroughtheconventionalpotentialflowtheory.Hydrodynamiccoefficients,waveexcitingforces,motionresponses,andmeandriftforcesofthebargesunderdifferentincidentwavedirectionsinthefrequencydomainarecalculated;waveelevationdistributionaroundIII万方数据上海交通大学硕士学位论文thebargesisalsoconcerned.Thecalculationsho

6、wsthatinthehydrodynamicresultsofthetwobarges,newresonantpeaksappearatsomewaveperiodsdifferentfromthesingle-bargecase.Inbeamseacondition,motionresponsesofthebargeontheleesidearesmallerthanthoseofthebargeontheweathersidebecauseoftheshieldingeffect.Attheresonanceperiod,thecalculatedwaveelevations

7、inthegapareextremelylargeandoverestimatedthroughcomparisonwithcorrespondingexperimentalresults.Thisdiscrepancycanbeattributedtotheneglectoffluidviscosityconsiderationinthepotentialflowtheory.Despitethedifferenceinpeakvalues,thecompariso