icem的帮助文件.docx

icem的帮助文件.docx

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icem的帮助文件

PipeBlade

Overview

Thistutorialexampleusesthe“Collapse”functiontocreateadegeneratetopologyinaConjugateHeattransferproblemaroundabladelocatedinthecenterofacylindricalpipe.

SummaryofSteps

TheBlockingStrategy

StartingtheProject

CreatingPartsintheMeshEditor

StartingBlocking

UsingPrescribedPointstoFittheBlocking

SplittingtheTopologyUsingPrescribedPoints

CollapsingBlockstoRepresenttheBladeMaterial

EdgetoCurveAssociationontheBlade

MovingtheVertices

GeneratingtheO-grid

DefiningSurfaceParametersfortheMesh

DefiningEdgeParameterstoAdjusttheMesh

Checkingmeshqualityfordeterminantsandangle

SavingbeforeQuitting

More:

TheBlockingStrategy

TheBlockingStrategy

Inthislesson,thebladeisregardedasaSolidregion,whiletheregionsurroundingthebladeisregardedastheFluidregion.UsingBlockSplittingat“Prescribedpoint”,theuserwillgenerateaHexahedralMeshforbothoftheregions,sothatthetopologyofthesolidregionisadegenerate‘Hexahedral’mesh.

BeforetheuseremploystheCollapsefunctionforhis/herownapplications,confirmthatthesolveracceptsdegeneratedhexas（forastructuredsolver）orpenta_6elements（prism）foranunstructuredsolver.

Note:

Settings>Selection>AutopickmodeshouldbeturnedOFFforANSYSICEMCFDtobehaveexactlyasthistutorialdescribes.

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StartingtheProject

StartingtheProject

TheinputfilesforthistutorialcanbefoundintheAnsysinstallationdirectory,under../v110/docu/Tutorials/CFD_Tutorial_Files>PipeBlade.Copyandopenthegeometry.tinfileinyourworkingdirectory.

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CreatingPartsintheMeshEditor

CreatingPartsintheMeshEditor

RightclickintheDisplayTreeonParts>CreateParttocreatedifferentPartsandassignthedifferentsurfaceofthegeometrytotheappropriatepart.RefertothefigurebelowfortheSurfacepartassignments.

Figure3-147ThePipeBladeconfiguration

SurfaceParts

AfterthePipeBladeprojectisopen,activatethePointsandSurfacesfromtheDisplayTree.SwitchonPoints>ShowPointsNames.

BegintheSurfacepartreassignmentbychangingtheregionenclosedbyGEOM/4-GEOM/7tothepartOUTLET.

TheregionthatisdenotedbyGEOM/0-GEOM/3shouldbereassignedtothepartINLET.

TheSurfacedefiningtheCylinderpipewillbeplacedintheSurfacepart,CYL.

ThesurfacesbelongingtothesolidbladeinthemiddleofthecylindershouldbeclassifiedasBLADE.

WhenalloftheSurfacepartshavebeenassigned（INLET,OUTLET,CYL,BLADE）,pressthemiddlemousebuttontoexitfromcontinuousmode.

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CurvePartsandPointParts

Forthistutorial,wewillleavethecurvesandpointsassignedtotheinitialpartGEOM.

CreatingtheMaterialPoints

SelectGeometry>CreateBody

>MaterialPoint

 EnterFLUIDintheCreateBodywindowthatappears.ThematerialpointthatwillbecreatedwillhelpustokeeptheFLUIDregionseparatefromtheSOLIDregion,butisnotnecessarysinceblockscansimplybecreatedintheFLUIDpartratherthancreatingamaterialpoint.

Withtheleftmousebutton,selecttwolocationsontheoppositesidesofthecylinder. NotethattheFLUIDmaterialpointshouldnotbewithintheBLADE. Iftetrameshing,thislocationwouldbeimportant. WithHexameshing,itisnot. Pressthemiddlemousebuttontoaccepttheselection,andpressApplyandtheBodynameFLUIDshouldappearwithinthegeometry（midwaybetweentheselectedlocations）.RotatethemodeltoconfirmthatFLUIDisinanappropriatelocation.

NowenterSOLIDasthenewPartNameintheCreateBodywindow.

Pressthelocationselectionicon

 andselecttwolocationsonthebladesurfacessothatthemidpointwillbeinsideoftheblade. Pressthemiddlemousebuttontoaccept,andpressApply. AfteracceptingthisPartsassignment,dynamicallyrotatethemodeltoconfirmthatSOLIDisinsidetheblade.

Whenthisiscomplete,allcomponentsoftheGeometryshouldnowhavepartnameassignments.

DeleteanyEmptyParts:

 FromtheDisplayTree,rightmouseselectonParts>DeleteemptyParts.

File>SaveProjectAstosavetheupdatedmodelbeforecontinuingoninthistutorial. Givetheprojectanynameyouwant.

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Blocking

Blocking

Initializeblocking,whichwillcreatethefirstblock,bygoingtoBlocking>CreateBlock

 >InitializeBlock

 .TheCreateBlockwindowwillopen.

SelecttheblockTypeas3DBoundingBox（default）fromthepulldownarrow. NamethePartasFluid. PressApplywithoutselectinganything,andtheinitialblockwillbecreatedaroundthewholemodel.

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Associationofvertextopoint

Associationofvertextopoint

TofittheInitializedBlockingmorecloselytothegeometry,theuserwillassociateverticestopoints.

SelectBlocking>Associate

 >AssociateVertex

 andthewindowshownwillopen. ToggleONBlocking>VerticesandrightmouseclickonVertices>NumbersunderBlockinginDisplayTree. 

SelectPointunderEntity.

Note:

Whenpossible,theBlockverticesonanycirculargeometryshouldbeplacedsothatedgesareequalinlengthandtheanglesbetweenedgesare90degrees. Thisamountstoverticesbeingplacedat45,135,225,and315degreesaroundthecircle. Thisresultsinthebestmeshquality.

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Associatingedgestocurves

Associatingedgestocurves

SelectAssociate

>AssociateEdgetoCurve

 . Presstheedgeselectionicon

  thenselectthefouredgesshowninthefigurebelowandpressthemiddlemousebutton. Thenpressthecurveselectionicon

 andselectthefourcurvesshowninthefigurebelowandpressthemiddlemousebutton. Noticethattheblockedgesthentransformfrom“white’to‘green’,confirmingtheirassociationwiththecurve. Alsonoticethatthefourcurvesbecomeonecolor,indicatingthattheyhavebeengroupedintoonecurve.

Similarly,associatethefouredgesontheothercircletothecorrespondingfourcurves.Toseeaconfirmationoftheseassociations,rightmouseclickonBlocking>Edges>ShowAssociationintheDisplayTree. 

Groupingcurves

Note:

Thissectiondoesnotneedtobeperformedonthemodel,butitshowstheuserhowtomanuallygroupcurves.

SelectBlocking>Associate

 >Groupcurves.

SelectthefourcurvescorrespondingtoOUTLETasshowninthefigureandpressApplytogroupthem.

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SplittingtheTopologyUsingPrescribedPointsandScreenSelect

SplittingtheTopologyUsingPrescribedPointsandScreenSelect

Thefollowingstepsinstructtheusertosplittheblockinthe‘k’and‘j’directionsaroundtheblade,thuscreatingfurtherblockingtopologyfortheblade.Thek-directionsplitswillbecreatedthroughtheprescribedpointmethod,whilethej-directionsplitswillbemadebyvisualjudgment.

PressView>Top,thenFitWindow

TurnoffVerticesatthisstage.

ChooseBlocking>SplitBlock

>SplitBlock

 anditwillopenthewindowasshowninthefigurebelow. ChooseAllvisibleandSplitmethodasPrescribedPoint. Selecttheedgeselectionicon

 thenselectoneoftheedgewhichisalongz-direction.AfterselectingtheedgeitwillpromptyoutoselectthepointSelectthePrescribepoint,GEOM/9andpressmiddleclicktoaccepttheselection.

Similarly,makeanothersplitusingthesameedgebutthroughthePrescribedPoint,GEOM/8.

Similarly,makeanotherhorizontalsplitthroughtheprescribedpointGEOM/12. Thefinalresultwillhavethreehorizontalsplitsasshowninbelow.

Note:

MakesurethattheEdgethatisselectedlieswithintherangeofthePrescribedPointthatwillbeselected.

Figure3-156SplitblockwindowFigure3-157Makethehorizontalsplitsintheblock

Thesearethesplitsinthe‘k’-direction.Thenextsetofsplitswillbeinthe‘i’direction.

NowselecttheSplitmethodasScreenselect. Presstheedgeselectionicon

 andselectanyofthehorizontaledges（whichisalongx-direction）tocreateaverticalsplit. IfSettings>Selection>AutopickmodeisOFF,pressApply,anditwillaskforalocationonthescreentosplitthrough. Selectonacurveoredgeonanylocationthatisverticallyinlinewiththerightsideoftheblade. IfAutopickmodeisON,youshouldleftmouseclickontheedgeandholdthebuttonwhiledraggingthesplittowhereyouwantit. Pressthemiddlemousebuttontocompletethesplitoperation. Thenusethesamemethodtocreateanotherverticalsplitontheleftsideoftheblade. 

Note:

EverytimeablockSplitisperformed,theIndexcontrolisupdated.Afterthesplitsarecomplete,thenewrangeoftheKindexwillbefrom0-6.

CollapsingBlockstoDisplaytheBlade

Inthissection,theCollapsefeatureisintroducedtocreatedegenerateblocksfortheblade.

Forclarityintheseoperations,rightmouseclickintheDisplaytreeonBlocking>IndexControl. ChangetheIndexcontrolforthe‘I’dimensionsothattheMinis2andtheMaxis3. TurnOFFthePointsfromtheDisplaywindow.Therestrictedtopologyconsistsoffourblocks,wherethetwocenterblocksbelongtotheblade.

Beforecollapsingtheblocks,changethePartfamilyofthetwocenterblockstoSOLID,thematerialrepresentingtheblade.

RightmouseclickonSOLID>AddtopartunderneathPartsintheDisplayTree,anditwillopentheAddtoPartwindow. SelectBlockingMaterial,AddBlockstoPart

 ,andselecttheblocksofthebladeasshownbelow,thenpressthemiddlemousebuttontocompletetheoperation.

Choosetheedgethatshouldbecollapsed. Inthiscaseitistheshortestedgeoftheselectedblocks. Selectthetwoblocksshowninthefigurebelow.PressApplytoCollapsetheblocks.

Aftercollapsingwegetthemodelasshownbelow.