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1、上海交通大學(xué)碩士學(xué)位論文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萬方數(shù)據(jù)上海交通大學(xué)碩士學(xué)位論文thebargesisalsoconcerned.Thecalculationsho
6、wsthatinthehydrodynamicresultsofthetwobarges,newresonantpeaksappearatsomewaveperiodsdifferentfromthesingle-bargecase.Inbeamseacondition,motionresponsesofthebargeontheleesidearesmallerthanthoseofthebargeontheweathersidebecauseoftheshieldingeffect.Attheresonanceperiod,thecalculatedwaveelevations
7、inthegapareextremelylargeandoverestimatedthroughcomparisonwithcorrespondingexperimentalresults.Thisdiscrepancycanbeattributedtotheneglectoffluidviscosityconsiderationinthepotentialflowtheory.Despitethedifferenceinpeakvalues,thecompariso
