Gridgen经典培训教程课件

Inthissession:GridgenTerminology.GUIComponents.GridgenHelp.Building2DStructuredGrids.Building2DUnstructuredGrids.Tutorial:“2DBump:BasicSkills.”GridgenTrainingOverview1Inthissession:GridgenTraininWhat’sanEntity?

Anentityisanyindividualelementthatmakesuppartofagridorgeometry.GridgenTerminologyDomainsBlocksConnectorsExamplesofGridgenentities2What’sanEntity? AnentityisConnectorsGridgenTerminologyConnectorsarethecurveentitiesthatdefineallgridedges.Connectorscontainoneormoresegments.Nodesmarkconnectorendpoints.ControlPointsletuserdefinesegmentshape.Connectorsaredimensionedbynumberofgridpointswithadistributiondescribinghowtheyareplaced.3ConnectorsGridgenTerminologyCDomainsGridgenTerminologyADomainisasurfacegridentityboundedbyedges.StructuredDomainsconsistsolelyofquadrilateralelements.UnstructuredDomainsconsistsolelyoftriangularelements.StructuredDomainshaveexactlyfouredges.UnstructuredDomainsgenerallyhaveoneedge(moreiftheytheencompassholes).Eachedgecontainsoneormoreconnector(s).4DomainsGridgenTerminologyADoBlocksGridgenTerminologyABlockisavolumegridentityboundedbyfaces.StructuredBlocksconsistsolelyofhexahedralelements.UnstructuredBlockscanconsistoftetrahedral,pyramidal,and/orprismaticelements.StructuredBlocksareboundedbyexactlysixfaces.UnstructuredBlocksgenerallyhaveoneface(moreiftheyencompassholes).Eachfacecontainsoneormoredomain(s).5BlocksGridgenTerminologyABloGridsAGridiscomposedofvolumeand/orsurfacegridblocks.StructuredGridscontainonlyquadrilateralandhexahedralelements.UnstructuredGridscontainonlytriangularandtetrahedralelements.HybridGrids(suchasthatshownhere)containbothstructuredandunstructuredgridelements(quads,triangles,hexes,andtets)andcanalsohaveprismaticandpyramidalelements.GridgenTerminology6GridsAGridiscomposedofvolDatabasesInGridgen,databasesrefertocollectionsofgeometryinformationthatcanbeusedtodefinetheshapetowhichthegridistobebuiltandtypicallycomefromcomputeraideddesign(CAD)software:Analytic–curveandsurfaceinformationfromaCADfile.Shell–discreteunstructureddatabasesurfaceentity,generallyimportedfromstereolithography(STL)formattedfiles.Network–bilinear(non-slopecontinuous)databasesurfaceentity,generallyimportedfromPlot3Dformattedfiles.Ofcourse,databasesarenotnecessarytobuildgridswithGridgen,butareoftenneededforimportingcomplexgeometries.GridgenTerminology7DatabasesInGridgen,databasesTheGridgenScreenGUIComponentsVersionListsGridgenversionnumberStatusTalliesnumberofgridentitiesMessageProvidesinstructionsandpromptsfortextinputTextInputEchoesdataenteredviakeyboardBlackboardDisplayscontext-sensitivegraphicalandtabulardata(akaDiagnosticorBrowserwindow)CommandMenuListsGridgenCommands(akaButtonMenu)DisplayShowsgraphicalimageofgridanddatabase8TheGridgenScreenGUIComponenTheMouse:Pan,Zoom,andPickLeftMouseButton:PanPressandholdtheleftmousebuttontopanthemodelimageinthedisplaywindow.Whilepanning,themousecursorchangesto:CenterMouseButton:ZoomPressandholdthecentermousebuttontochangethemodelimage’ssize,pushingthemouseawayfromyouzoomsoutwhilepullingittowardsyouzoomsin.Formicewithacenterwheel,thewheelcanberolledorhelddowntocontrolzoom.Ontwobuttonmice,zoomingisaccomplishedbyholdingbothbuttonsdown.Whilezooming,themousecursorchangesto:RightMouseButton:PickPressandreleasetherightmousebuttontoselectcommandsfromthecommandmenuorpickentitiesinthedisplaywindoworbrowserlist.Whilepicking,themousecursorchangesto:GUIComponents9TheMouse:Pan,Zoom,andPickSomeMouseOptionsGUIComponentsThefunctionsoftheleftandrightmousebuttonscanbereversed,sothatleftisforpickingandrightisforpanning.ThiscanbedonebyselectingLeftPk.Whendealingwithsmallergeometricentities,itmayalsobedesirabletoreducethemousesensitivityinpanning,zooming,androtatingthescreenimage.Thiscanbedonebyclickingonthebutton(moreclicks,lesssensitivity).

Youmaywishtochangesomeofthedefaultmousesettings.ThesecanbeaccessedbyselectingtheDisplayorDispsubmenufromGridgen’sMAINMENU.10SomeMouseOptionsGUIComponenModelRotationsYXZScreenCoordinatesBodyCoordinatesGUIComponentsGridgenhastwodistinctcoordinatesystems:screencoordinatesandbodycoordinates.Inadditiontopanning,zooming,andpicking,themousebuttonscanalsobeusedtorotatethemodelscreenimage.ThisisdonebycombiningtheleftandcentermousebuttonswiththeCtrlkey:Ctrl+leftmousebutton:screenxandyrotations.Ctrl+centermousebutton:screenzrotations.11ModelRotationsYXZScreenBodyGUModelRotations(Continued)Formorepreciserotationcontrol,thefollowingnumpadkeyscanbeused:7rotatesaboutthexscreenaxis.8rotatesabouttheyscreenaxis.9rotatesaboutthezscreenaxis.NumLockrotatesaboutthexbodyaxis./rotatesabouttheybodyaxis.*rotatesaboutthezbodyaxis.Additionalrotationfeaturescanbeaccessedwiththefollowing“hotkeys”:PageDownusedwithanyofthex-y-zbody/screenkeysresultsina90deg.rotationaboutthecorrespondingcoordinatedirection.PageUpusedwithanymodelmanipulation,whetherbymouseorkeyboard,provides3xaccelerationoftheoperation.+and–numpadkeysreversethedirectionofakeyboardmodelrotation.Altusedwithanumpadmodelrotationgivesasingleincrement(3deg.)rotation.GUIComponents12ModelRotations(Continued)ForCommonlyUsedHotKeysGUIComponentsNote:HotkeysforGridgencommandsareshownaspinkcharactersonthecorrespondingGUIbuttons.13CommonlyUsedHotKeysGUICompFileBrowsingSelectingInput/OutputfromtheMAINMENUopenstheINPUT/OUTPUTCOMMANDSsubmenufromwhich(inthisexample)theINPUTGridgenFILEsubmenuhasbeenselected.TheBrowserWindowshowstheappropriatecontentsofthecurrentworkingdirectory.Themousecanbeusedtoscrollthroughandselectfromlist.SelectingTypein…

Nameallowsyoutotypeinafilenameforimportorexport,whileTypein…Dirletsanewworkingdirectorytobeset.SelectingGotoDir…

<drv>(/inUnix)willprovidelistofavailabledrivestochangetoascurrentworkingdirectory,whileGotoDir…OrigchangestheworkingdirectorybacktotheoriginaldirectorywhereGridgenwasopened.GUIComponentsOncefilehasbeenselected,Openisclicked.14FileBrowsingSelectingInput/OFileBrowsing(Continued)UponenteringtheTypein…

Namemode,thetextinputwindowwillechothefilenameenteredviathekeyboard.Oncethenameisentered,theEnterkeyonthekeyboardorOpenbuttonintheGUImustbeclicked.Theesckeycanbeusedtoexitfromtextinput.Noothercommandsormanipulationsareavailablewhileinthismode.Glyphexpressionsarevalid.GUIComponents15FileBrowsing(Continued)UponGridgenFileNamesGridgenRestartFiles(.gg)containentiregridmodelsfromcontrolpointdefinitionsthroughboundaryconditionsettings.Theyonlyreferencedatabaseinformation.CompositeDatabaseFiles(.dba)store,inGridgen’snativedatabasemodelformat,datafromalldatabasesources,aswellasdatabaseentitydisplayattributesandlayerinformation.GUIComponents16GridgenFileNamesGridgenRestGridgenHelpGridgenHelpGridgen’shtml-basedhelpcanbeaccessedfromvirtuallyanymenuwithintheprogrambyeithermouseclickingontheHelpbuttonorentering?Fromthekeyboard.ThishelpdocumentationisequivalenttotheUserManualandautomaticallyopenstothepertinentsectionrelatingtotheoperationormodecurrentlyinusewithinGridgen.Forexample,thewindowattheleftopenswhenhelpiscalleduponfromtheopeningI/Omenu.17GridgenHelpGridgenHelpGridgeBuilding2DStructuredGridsBuilding2DStructuredGridsBeginningwiththeairfoildatabasegeometrybelow,thehybridgridshownattherightwillbeconstructedusingGridgen,startingwiththe2Dstructuredblockatthetop.18Building2DStructuredGridsBuThe“Bottom-Up”GridgenProcessBuilding2DStructuredGridsSelectAnalysisSoftwareandMeshDimensionalityImportandManipulateDatabaseGeometryCreateSegmentsandConnectorsDimensionConnectorsandDistributeGridPointsAssembleDomainsAssembleBlocksSetupCFDAnalysisBoundariesExportandSaveFiles19The“Bottom-Up”GridgenProcessSelectAnalysisSoftwareThefirststepinanyGridgenprojectistheselectionoftheCFDanalysissoftwareandthedimensionality(2Dvs.3D)ofthemeshbeingconstructed.IntheMAINMENU,AnalysisS/Wischosentobringupthecorrespondingcommandsmenu.SelectAnalysisS/Wisthenclicked,whichbringsupthefairlylengthylistofsupportedCFDpackages.Forthisexample,2Dandthedefaultgenericsolverwillbeselectedviamouseclicks.Oncetheseselectionsaremade,theNextPagebuttonisclickedtobringupthesecondhalfofthesupportedsoftwarelistsotheDonebuttonattheendofthelistcanbeselectedtoconfirmthechoices.Building2DStructuredGrids20SelectAnalysisSoftwareThefiSetDefaultsBuilding2DStructuredGridsAlthoughnotessential,settingdefaultvaluesforsomeitems,suchasconnectordimension,cansavetimeduringthemeshconstructionprocess.IntheMAINMENU,Defaultsischosentobringupthedefaultsmenu.Note:AnotherwaytobringupthedefaultsmenuistoselecttheDfltquickkey.Theblackboardwindowshowsthecurrentdefaultsettings,e.g.,thedefaultconnectordimension(ConnDimens)is0.Thiscanbechangedbyselectingtheappropriatebuttonbelow.Thisactivatesthetextinputwindow.Forthepresentexample,typein36andthenhitEnter

tostoreit.Theblackboardwindowwillshowthenewvalue.ClickDonetofinishsettingdefaults.21SetDefaultsBuilding2DStructImportDatabaseGeometryBuilding2DStructuredGridsNext,thedatabasefilecontainingtheairfoilgeometrywillbeimported.IntheMAINMENU,Databaseischosentobringupthecorrespondingcommandsmenu.Note:Asanalternative,thefhotkeyonthekeyboardcouldbeused.ImportisthenselectedtobringuptheINPUTDATABASEFILEsubmenu.Thebrowserwindowshowstheavailabledatabase(.dba)filesinthecurrentworkingdirectory.Thedesiredfilecanthenbepickedwiththemouse(changingthenamefrompinktoblackincolor).ClickonOpentoreadthefileintoGridgenandthenDoneintheDATABASECOMMANDSmenutoreturntotheMAINMENU.22ImportDatabaseGeometryBuildiCreateConnectorsBuilding2DStructuredGridsIt’snowpossibletostartbuildingtheconnectorsthatwillmakeuptheedgesofthegrid.Thefirstconnectorwillmatchtheuppercontouroftheairfoil.IntheMAINMENU,Connectorsischosentobringupthecorrespondingcommandsmenu.Sincetherearenoconnectorsyet,onlytheCreatecommandisavailableintheCONNECTORCOMMANDSmenu.SelectthistoopentheCreateConnectorsubmenuTherearethreewaystobuildaconnector:individualcurvesegmentscanbecreatedandlinkedtogether,twoendpointscanbechosentoformaconnectorbetweenthem,oraconnectorcanbelaiddownuponadatabaseentity.Thislastoptionwillbepickedhere.23CreateConnectorsBuilding2DSCreateConnectors(Continued)Theblackboardwindowshowstheavailabledatabaseentities.Themousecanbeusedtopickentitiesfromthislistordirectlyfromthedisplaywindow.Onceselected,thetableentryandtheconnectorinthedisplaychangefrompinktoblackincolor.ClickingonDonecompletestheprocess.Becausethedefaultdimensionhasbeenset,thenewconnectorappearsinpalegreen(ifundimensioned,itwouldhavebeenbrightgreen).Building2DStructuredGrids24CreateConnectors(Continued)TCreateConnectors(Continued)Theremainingconnectorsneededtoformtheedgesofthemeshwillbecreatedwiththe2PointConnectorsoption.EachCPcanbeselectedfromthedisplayviathemouseorenteredviathekeyboard.Foreachnewconnector,Gridgeninitiallypositionsthedisplaycursoratthelastendpointofthepreviouslydefinedconnector.Here,allbutthelastconnectorhavebeendefined,andthedisplaycursorispositionedatthatconnector’strailingendpoint.Thetrailingendpointforthislastconnectorisalsotheleadingedgeendpointfortheconnectorappliedtotheairfoil’suppersurface.ItcanbeselectedbyrepositioningthedisplaycursorandusingbyPickingorbyenteringitscoordinatesviaKeyboard.Again,clickingDonefinishesthejob.Asthisisthedesiredstartingpointofthelastconnector,itwillbeselectedviabyPicking.Building2DStructuredGrids2,0,02,1,0-1,1,0-1,0,025CreateConnectors(Continued)TCreateConnectors(Continued)Withthelastconnectorcompleted,clickonDoneCreatingConnsintheCREATECONNECTORmenu(orjusthitthecorrespondinghotkey,esc).Next,toseethegridpointdistribution,toggleConGPsinthedisplaymenu(orhitthehotkeycombination^ac).

Asshown,it’sclearthattherearefarmoregridpointsalongthebottomedgethanthetop(sincetherearethreeconnectorsbelowtotheoneabove,buteachwiththesamedefaultdimension).Thishastobecorrectedbeforethedomaincanbebuilt.Building2DStructuredGrids26CreateConnectors(Continued)W(Re)DimensionConnectorsBuilding2DStructuredGridsIntheCONNECTORCOMMANDSmenu,selectRedimensionGrids.Thiswillallowthetopconnectortobepickedinthedis-playwindowviathemouse,anditsnewdimensiontobeenteredviathekey-board.Inthiscase,106isthatnewdimension(whileeachofthethreebottomconnectorshas36gridpoints,thecenteronesharesoneofitsendpointswitheachofitsneighborsreducingthetotalfortheedgeby2).OnceEnterhasbeenpicked,Done-ApplyNewDimsisclickedtofinish.27(Re)DimensionConnectorsBuildi(Re)DistributeConnectorsIt’salsopossibletoalterthedistributionofgridpointsalongconnectors.Thiswillbediscussedinmoredetaillater.UnderCONNECTORCOMMANDS,pickSetsVals.Selectsubconnector(s)forwhichthedistributionistobereset.Then,SelectDone.Thenewsvaluecanthenbeenteredandapplied.

s=0

s=0.01Building2DStructuredGridsInthepresentexample,thegridpointswillremainevenlydistributed.28(Re)DistributeConnectorsIt’sAssembleDomainsBuilding2DStructuredGridsAllisnowreadytoassembletheconnectorsintothefouredgesthatwillboundthedomainofthemesh.

IntheMAINMENU,pickDomainstoswitchtothatmenu.Next,selecttheCreatecommandtobeginbuildingthenewdomain.Besurethatstructuredcelltypeischosen,thenpickAssembleEdges.Adomainschematicwillappear,aswillseveralchoices.EnsurethatAutoNextEdgeisoff,andAutoCompleteison.29AssembleDomainsBuilding2DStAssembleDomains(Continued)Building2DStructuredGridsThefirstedgewillconsistofthethreebottomconnectors.Themouseisusedtoselecttheseinturnfromlefttoright–thepicturehereshowsthesceneafterthefirsttwohavebeenpickedwiththemousecursorpoisedtoselectthethird.Oncethisconnectorhasbeenadded,NextEdgeisselectedtotellGridgentheedgeiscomplete.Themouseisthenusedtoselecttheconnectorontherightsideofthedomaintobe.WhenNextEdgeisagainselectedafterthat,thedomainwillautocompleteitself.30AssembleDomains(Continued)BuAssembleDomains(Continued)Building2DStructuredGridsThisisthedomainthatresults.Notethatthemeshinthevicinityoftheleadingedgeoftheairfoilisabitroughlooking.ThiscanbecorrectedwithalittlesmoothingdonewithGridgen’sstructuredsolver.TogetbacktotheDOMAINCOMMANDSmenutodothis,select

Done.31AssembleDomains(Continued)BuTheStructuredSolverBuilding2DStructuredGridsTorunthesolver,firstchooseRunSolver

StructuredfromtheDOMAINCOMMANDSmenu.Thedomainisnextpicked–inthiscasebyhighlightingtheentryinthebrowserwindow.OnceDoneisselected,theparametersfortheellipticsolvercanbeselected.Inthisinstance,theRunNIterationsbuttonisselected,and10isenteredviathekeyboard.ClickingEnterwillthenstartthesolver.32TheStructuredSolverBuildingTheStructuredSolver(Continued)Building2DStructuredGridsThemeshlineswillshiftasthesolverruns,endingwiththesmoothedmeshasshownhere.Done–Saveisselectedtosavethechanges.33TheStructuredSolver(ContinuAssembleBlocksBuilding2DStructuredGridsFromtheMAINMENU,Blocksisselected.Thegridblockisnextassembledfromthedomain,inmuchthesamewayasadomainisassembledfromitsconnectoredges.CreateisthenselectedfromtheBLOCKCOMMANDSmenu.ThisopenstheCREATEBLOCKsubmenu.EnsurethestructuredcelltypeistoggledbeforeclickingonAssembleFaces.ThenextstepistopickAdd1stFacetobeginformingtheblock.34AssembleBlocksBuilding2DStrAssembleBlocks(Continued)Building2DStructuredGridsThefaceisselectedbymouseclickingonitsimageinthedisplaywindow.Sincethisisa2Dblock,oncetheSavetheFacebuttonispressed,theblockiscomplete.PressDone–SaveBlockstofinishthisstep.35AssembleBlocks(Continued)BuiSetAnalysisBoundariesBuilding2DStructuredGridsThefinalstepingeneratingthemeshissettinguptheboundariesfortheCFDsoftware.FromtheMAINMENU,theAnalysisS/Wsubmenuisselected.SetBCsisthenpicked.36SetAnalysisBoundariesBuildinSetAnalysisBoundaries(Continued)Building2DStructuredGridsTheindividualconnectorsthatwillmakeupeachboundarycanthenbehighlightedbymouseinthedisplaywindow.Onceallofthedesiredconnectorsthatwillmakeaboundaryareselected,Doneispickedtobringupasecondmenutospecifytheboundarytypetobeassignedtothatcollection.Inthiscase,theinlettotheflowfieldisbeingselected.Theotherboundariesarespecifiedinthesamemanner.37SetAnalysisBoundaries(ContiExportandSaveFilesBuilding2DStructuredGridsThemeshandboundaryconditionsarenowreadytobeexportedforusewiththeCFDsoftware.FromtheMAINMENU,Input/Outputisselected.Fromhere,theindividualfilescanbeexported.Thewindowforwritingthefilesisbasicallyidenticaltothatusedtoinputthedatabasefilesatthebeginningofthegridgenerationprocess.38ExportandSaveFilesBuildingBuilding2DUnstructuredGridsBuilding2DUnstructuredGridsIt’snowtimetobuildtheunstructuredblockaroundthelowerhalfoftheairfoil.Thefirstfewsteps(selectingtheanalysissoftware,settingdefaults–inthiscasetheconnectordimension,andimportingthedatabasegeometry)arethesameasbefore.Tosavesometime,itwillbeassumedthatthesehavealreadybeenperformed.39Building2DUnstructuredGridsThe“Bottom-Up”GridgenProcessSelectAnalysisSoftwareandMeshDimensionalityImportandManipulateDatabaseGeometryCreateSegmentsandConnectorsDimensionConnectorsandDistributeGridPointsAssembleDomainsAssembleBlocksSetupCFDAnalysisBoundariesExportandSaveFilesBuilding2DUnstructuredGrids40The“Bottom-Up”GridgenProcessCreateConnectorsEverythingisthussettostartbuildingtheconnectorsthatwillmakeupthegrid’sedges.IntheMAINMENU,Connectorsischosentobringupthecorrespondingcommandsmenu.SelectCreatetoopentheCreateConnectorsubmenuAsthefirstconnectorwillbelaiddownontheairfoildatabasegeometry,pickOnDBEntities.Building2DUnstructuredGrids41CreateConnectorsEverythingisCreateConnectors(Continued)Asseenpreviously,theairfoiliscomposedoftwodatabaseentities,onefortheuppersurfaceandoneforthelower.Themousecanbeusedtopickthecurveforthelowersurfacefromthelistintheblackboardwindowordirectlyfromthedisplaywindow.Notethatplacingthemousecursorovereithertheentryinthetableortheentityinthedisplayhighlightsbothtoaidtheselectionprocess.ClickingonDonecompletestheprocess.Building2DUnstructuredGrids42CreateConnectors(Continued)ACreateConnectors(Continued)Asbefore,the2PointConnectorsoptionisusedtocreatetheremainingconnectors.SinceGridgeninitiallypositionsthedisplaycursoratthelastendpointofthepreviouslydefinedconnector,it’spossibletoquicklyboxintheairfoilfrombelow.Here,thecursorispositionedbackattheleadingedgeoftheairfoil,readytopickthefinalendpointofthelastconnectorneededtocompletethecircuit.Withthecursorinposition,thelastconnectorcanbecompletedbyPicking.Building2DUnstructuredGrids2,-1,0-1,-1,02,0,0-1,0,043CreateConnectors(Continued)ACreateConnectors(Continued)Withthelastconnectorcompleted,clickonDoneCreatingConnsintheCREATECONNECTORmenu(orjusthitthehotkey,esc).Unlikeastructureddomain,theunstructuredonebeingbuiltinsidetheseconnectorswillnotrequirebalancednumbersofgridpointsonoppositeedges(indeedtherewillbeonlyoneedgethatsurroundstheentiredomain).However,topromoteauniformcelldensity,itwillstillbedesirabletoredimensionthatlongconnectoratthebottomtohaveroughlyasmanygridpointsasthethreeconnectorsontheothersidehavecombined.Sincethestepstodothisarethesameaspreviouslyshown,justthefinalresultisdisplayedhere.Building2DUnstructuredGrids44CreateConnectors(Continued)WAssembleDomainsEverythingisnowreadytoassembletheconnectorsthatwillboundthemeshdomain.IntheMAINMENU,pickDomainstoswitchtothatmenu.Next,selecttheCreatecommandtobeginbuildingthenewdomain.Besurethatunstructuredcelltypeischosen,thenpickAssembleEdges.Asanunstructureddomaincanhaveanynumberofedges,theblackboardwindownowjustshowswhichedgeiscurrentlybeingformed.MakesureAutoCompleteandAutoSaveareturnedon.Aseachconnectorisadded,thelatterwillcheckwhethertheloophasbeenclosedandwillautomaticallysaveandinitializethedomainwhenitis.Building2DUnstructuredGrids45AssembleDomainsEverythingisAssembleDomains(Continued)Thenextstepistoselectthefirstconnector(thebottomoneisbeingpickedhere)tobeaddedtotheedge.Sincethereisonlyonepossibleloop,AutoCompletestepsintocloseit,whereuponAutoSavesavesandinitializesit.Thisisthedomainthatresults.TogetbacktotheDOMAINCOMMANDSmenu,selectDone.Fromthere,DonecanbeselectedagaintoreturntotheMAINMENU.Building2DUnstructuredGrids46AssembleDomains(Continued)ThAssembleBlocksFromtheMAINMENU,Blocksisselected.Thegridblockisnextassembledfromthedomain,followingthesamebasicprocedureasforstructuredblocks.CreateisthenselectedfromtheBLOCKCOMMANDSmenu.ThisopenstheCREATEBLOCKsubmenu.EnsuretheunstructuredcelltypeistoggledbeforeclickingonAssembleFaces.ThenextstepistopickAdd1stFacetobeginformingtheblock.Building2DUnstructuredGrids47AssembleBlocksFromtheMAINMAssembleBlocks(Continued)Thefaceisselectedbymouseclickingonitsimageinthedisplaywindow.Sincethisisa2Dblock,oncetheSavetheFacebuttonispressed,theblockiscomplete.PressDone–SaveBlockstofinishthisstep.Fromhere,settingtheboundaryconditionsandexportingthefilesfortheCFDsolverfollowthesamepathasshownforthe2Dstructuredgrid,sowillnotberepeated.Building2DUnstructuredGrids48AssembleBlocks(Continued)TheSetAnalysisBoundariesSettingboundaryconditionsforanunstructuredmeshisthesameasdoingsoforastructuredone,buttherearesomedifferencesinhowtheboundaryfacesaredisplayedinthebrowser.BlockNumberCoordinateDirection(Structured)FaceNumber(Unstructured)ConnectorNumberBoundaryCondition(Type1...areblockinterfaceconnections)Building2DUnstructuredGrids49SetAnalysisBoundariesSettingGridgenTrainingInthissession:GridgenTerminology.GUIComponents.GridgenHelp.Building2DStructuredGrids.Building2DUnstructuredGrids.Tutorial:“2DBump:BasicSkills.”Review50GridgenTrainingInthissessionGridgenTrainingInthissession:Building3DStructuredGrids.(Re)Dimensioningand(Re)DistributingStructuredGrids.Tutorial:“SweptRamp:BasicMultiBlockStructuredGrid.”Overview51GridgenTrainingInthissessionBeginningwiththe2Dairfoilmeshbelow,the3Dhybridgridshownattherightwillbeconstructed,startingwiththe3Dstructuredblockatthetop.Building3DStructuredGridsBuilding3DStructuredGrids52Beginningwiththe2DairfoilThe“Bottom-Up”GridgenProcessBuilding3DStructuredGridsSelectAnalysisSoftwareandMeshDimensionalityImportandManipulateDatabaseGeometryCreateSegmentsandConnectorsDimensionConnectorsandDistributeGridPointsAssembleDomainsAssembleBlocksSetupCFDAnalysisBoundariesExportandSaveFiles53The“Bottom-Up”GridgenProcessAnalysisS/WandDefaultSettingsBeforeproceeding,togglethe3DandgenericsolverbuttonsinSELECTANALYSISS/W...andbesurethatthedefaultconnectordimension(ConnDimens)issetto36inSETDEFAULTVALUES.Building3DStructuredGrids54AnalysisS/WandDefaultSettiCopyingDomainsBeforetheblockcanbeformed,theremainingdomainsthatmakeupitsfacesmustbecreated.First,theexistingdomainswillbecopied.

CopyispickedintheDOMAINCOMMANDSmenu.PickAllisthenselectedintheCopyingDOMAINSsub-menuandthenDone.Building3DStructuredGridsNext,thehandl