aqwa-training-sxd-9

©2010ANSYS,Inc.Allrightsreserved.1ANSYS,Inc.Proprietary©2010ANSYS,Inc.Allrightsreserved.1ANSYS,Inc.ProprietaryAQWATrainingCourseDrShuangxingDuANSYSInc.©2010ANSYS,Inc.Allrightsreserved.2ANSYS,Inc.ProprietaryThetopicscoveredinthetrainingcourseareasfollows:•descriptionofprogramcapabilities•theoreticalbackground•modellingtechniques•analysisprocedure•datarequirementsandpreparation•descriptionofoutputandinterpretationofresults•workedexamplesTopic©2010ANSYS,Inc.Allrightsreserved.3ANSYS,Inc.ProprietaryAQWAPrograms•StructureandCapabilitiesofAQWAPrograms–AQWALINE•3-Ddiffraction&radiationanalysisprogramforwaveforceandhydrodynamicpropertycalculations;hydrostaticanalysis–AQWALIBRIUM•Structureequilibriumpositionandforcebalancecalculations;eigenmodeanddynamicstabilityanalysis–AQWAFER•Spectralanalysisofstructuremotion(wavefrequencyor/anddriftfrequency)andmooringtensioninirregularwaves©2010ANSYS,Inc.Allrightsreserved.4ANSYS,Inc.ProprietaryAQWAPrograms–AQWANAUT•Timedomainprogramforwavefrequencystructuremotionandmooringtensionanalysesinlargewaves–AQWADRIFT•Timedomainprogramfordriftfrequencyandwavefrequencystructuremotionandmooringtensionanalysisinirregularwaves–AQWAGraphicalSupervisor(AGS)•AQWApreandpostprocessor;on-lineanalysis–AQWAWAVE•InterfaceprogramtotransferwaveloadsfromAQWALINEtoaFEmodelforstructuralanalysis©2010ANSYS,Inc.Allrightsreserved.5ANSYS,Inc.ProprietaryGeneralRelationsbetweenProgramsLIBRIUMWAVEASAS(FEmodel)ANSYSAGSFERNAUTDRIFTLINEEXCEL©2010ANSYS,Inc.Allrightsreserved.6ANSYS,Inc.ProprietaryMooredTankerSemiSubTypicalAQWAModels©2010ANSYS,Inc.Allrightsreserved.7ANSYS,Inc.ProprietaryTransportationFPSOSparShipinchannelTypicalAQWAModels©2010ANSYS,Inc.Allrightsreserved.8ANSYS,Inc.ProprietaryANSYS-to-AQWAInterface©2010ANSYS,Inc.Allrightsreserved.9ANSYS,Inc.ProprietaryAGSmeshgeneration©2010ANSYS,Inc.Allrightsreserved.10ANSYS,Inc.ProprietaryForce&ResponseCurvesShearForce&BendingMomentAGSPost-processing©2010ANSYS,Inc.Allrightsreserved.11ANSYS,Inc.ProprietaryPressurecontourWavesurfacecontourDiffractedwavesurfaceAGSPost-processing©2010ANSYS,Inc.Allrightsreserved.12ANSYS,Inc.Proprietary●InstallationAQWA,AGSandAQWA-WAVEAQWAManualsandexamples●AGSdemonstrationOpen-Open/close,andsaveAQWAmodelsEdit-CreateandeditAQWAmodelsRun-PerformanAQWAanalysisonthepresentlyloadedmodelGraphs-DisplayandmanipulateAQWAresultsgraphicallyPlots-DisplayandeditAQWAmodelsvisuallyCableDynamics-DefineandanalyzeproblemsinvolvingcabledynamicsHelp-Accesstotheonlinehelpsystem©2010ANSYS,Inc.Allrightsreserved.13ANSYS,Inc.ProprietaryAQWAGlobalCoordinateSystemAQWAGlobalCoordinateSystemisreferredtoastheFixedReferenceAxes(FRA):•theoriginliesinthestillwaterplane•thepositivezaxisisverticallyupwards•arighthandedsystem•itisnotrelatedtothedirectionsNorth,South,EastandWest0zyxW.L.©2010ANSYS,Inc.Allrightsreserved.14ANSYS,Inc.ProprietaryHydrostaticRigidbodymotions:Surge,Sway,Heave-translationalRoll,Pitch,Yaw-rotationalArchimedes’sprincipleBuoyancyofanimmersedbody=weightofthefluiddisplacedHydrostaticpressureG:centreofgravityB:centreofbuoyancyBuoyancyistheresultantofallhydrostaticforceoverwettedsurface0Zp0ZpZ0GBBowSternPortsideStarboardsidexzy©2010ANSYS,Inc.Allrightsreserved.15ANSYS,Inc.ProprietaryDirectionsinAQWA–Thewave,windandcurrentdirectionsaredefinedinAQWAasthedirectionswhichtheyaretravellingtowards.–Thedirectionisdefinedastheanglebetweenthewave(orcurrent,wind)andthepositivexaxismeasuredanti-clockwise.–DirectionsinAQWAareinputandoutputindegrees.XaxisWavedirection(orcurrent,wind)positiveangleY©2010ANSYS,Inc.Allrightsreserved.16ANSYS,Inc.ProprietaryPhaseAngle–InAQWA,thephaseangle(Φindegrees)ofaparameterdefinesthetimedifference(dt)fromthetimewhenthewavecrestisattheCoGofthestructuretothetimewhentheparameterreachesitspeakvalue.(dt=Φ*T/360,whereTisthewaveperiod).–Apositivephaseangleindicatesthattheparameterlagsbehindthewave.©2010ANSYS,Inc.Allrightsreserved.17ANSYS,Inc.ProprietaryWavesinAQWAWaveTypes:1)AiryWaves(linearwave)a=Acos(-ωt+kx)(ω:frequencyinradians/sec;k:wavenumber)UsedinAQWALINE,LIBRIUM,FER,DRIFT,NAUT(optional)2)Stokes2ndOrderWavesa=Acos(-ωt+kx)+0.5kA²cos2(-ωt+kx)UsedinAQWANAUTbydefault©2010ANSYS,Inc.Allrightsreserved.18ANSYS,Inc.ProprietaryWavesinAQWAWaveForms:1)RegularWavesUsedinAQWALINE,NAUT(bydefault)2)IrregularWaves●DefinedbyawavespectrumandusedinAQWALIBRIUM,FER,DRIFT,NAUT●ImportedtimehistoryofwaveelevationusedinAQWADRIFT©2010ANSYS,Inc.Allrightsreserved.19ANSYS,Inc.ProprietaryWavesinAQWAWavespectrumtypesacceptedinAQWAare:a.P-Mspectrumb.JONSWAPspectrumc.Userdefinedspectrumd.GaussianspectrumforCrossSwellIrregularwavescanbeintheformof:a.Longcrestedwaves;ORb.Shortcrestedwaves,ieaspreadsea(onlyforAQWALIBRIUMandFER)©2010ANSYS,Inc.Allrightsreserved.20ANSYS,Inc.ProprietaryWindandcurrentinAQWAWindtypesacceptedinAQWAare:a.Uniformwindb.OchiandShinwindspectrumc.APIwindspectrumd.NPDwindspectrume.User-definedwindspectrumCurrenttypesacceptedinAQWAare:a.Uniformcurrentb.Profiledcurrentvelocity©2010ANSYS,Inc.Allrightsreserved.21ANSYS,Inc.ProprietaryWaveForcesonStructures•Fo