AQWA-Intro-14.0-WS02.1-AQWAWB-HD

WS2.1-1ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012IntroductiontoANSYSAQWACustomerTrainingMaterialWorkshop2.1ANSYSAQWAHydrodynamicDiffractionWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-2ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialTheAQWASimulationProcessDesignModelerCADHydrodynamicDiffractionWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-3ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialCreatinggeometryreadyforimporttoWBHD•HDusesimportedgeometryfromDesignModeler.ThisisusedtocreatethemajorityoftheAQWAmodel–Hulldefinition–Morison(TUBE)elements•ForAQWAspecificgeometrythisisinputviatheHDuserinterface–Pointmasses–DISCelements•ThemainrequirementsforWBHDcanbesummarizedasfollows:–Eachvessel(orstructure)isrepresentedasasinglepart,asgeneratedinDesignModeler.–Thepanelmodelmustbesuchthatthemeshisuptothewaterline.–Thewaterlinedefinestheglobalverticaloriginfortheanalysis.Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-4ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialVessel/Structuredefinition•Eachvesselorstructuremayconsistofoneormorebodies,butMUSTbecontainedwithinaPart•Herewehaveashipandapier.–Theshipconsistsoftwobodies,oneabovethewaterlineandasecondbelowthewaterline.–Thepierhasthreebodies,definingaboveandbelowwater,plusthebase,whichhasspecialconsiderations(moreonthislater).Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-5ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialGlobalaxissysteminAQWAWB•ThewaterlinedefinestheAQWAglobalreferenceaxis(FRA)•ThegeometryisdividedatthispointtoallowmeshingaboveandbelowthewaterlineWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-6ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialRadiation/DiffractionAnalysisStages•WBHDforthediffractionanalysisconsistsoffivestages–InsertHDsystemandassociategeometry–AddAQWAspecificparameters–AddAQWAspecificelements–Mesh–Analysisandpost-processingWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-7ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialWorkedExercises•Threemodelsaregoingtobeconsidered–Singleship–Twoshipsdemonstratinghydrodynamicinteraction–OneshipandapierdemonstratingspecificrequirementsofincludingafixedstructureintheanalysisWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-8ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialInsertHDSystemandassociategeometry•CreateHDSystem(asshowninLecture1)•ImportCADgeometryand/orcreatemodeldirectly•Repairasnecessary•Positionthemodel(s)inthecorrectverticalandhorizontallocationsrequiredfortheanalysis•Cutthemodel(s)atthewaterlinetoprovidetherequireddelineationbetweenaboveandbelowwater(noelementsplitting)•Combinebodiesassociatedwithasinglevesseltoformonepart.Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-9ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialCreateHDsystem•SetUnits•AddHDsystembydrag&dropontoWBProjectSchematicpage.•RMBonGeometrycell,ImportGeometryBrowse,andbrowsetoship.igsWorkshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-10ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialImportCADgeometry•DoubleclickonGeometrycelltoopenDesignModeler•Selectmetersaslengthunit•OndetailsViewfortheImportedgeometrysetSimplifyTopologytoYes,andTolerancetoLoose.Thiswillrepairsomegeometryissueswiththeigesfile.•ClickingonGeneratewillcreatethegeometrywithinDM.Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-11ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialPositionmodeltocorrectposition•WecanmakeuseoftheBodyOperationTranslatetopositionthevesselinthecorrectposition.Weselectthebodybyclickingontheimageoftheship.•Hereweareoffsettingby-8metersinthevertical(Z)directiontoadjustthedraft.UseDirectionDefinitionCoordiantes.Clicktocompletetheoperation.Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-12ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterialDefinethewaterline•Wenowneedtocutthemodelatthewaterlinesothatwecanmeshwithoutelementscrossingthisline•FirstuseToolsFreezetoenablethesliceoperation.Themodelwillbecometransparent(thedefaultactionforDMistomergebodiestogether,whichisnotwhatwerequirewhenwecutthemodel).Workshop2.1–ANSYSAQWAHydrodynamicDiffractionWS2.1-13ANSYS,Inc.Proprietary©2012ANSYS,Inc.Allrightsreserved.Release14.0January2012CustomerTrainingMaterial...Definethewaterline•TheSliceoperationusestheglobalXYPlanetosliceallbodies.Inthisexampleweonlyhaveonebody,butthesameeffectmaybeappliedtomultiplebodies.OncetheSliceoperationisinsertedclickonXYPlaneintheTreeOutlinetodefinetheBasePlane.•Clicktocompletetheoperation.Workshop2.1–ANSYSAQWAHy