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Tutorial1:SimpleStarCCM+Example

PousellieFlow

Fullydevelopedviscous,laminarflow,inalongstraightpipe.

Wewillmodelthisin2DusingSTAR-CCM+Version5.02.009

1. StartStar-CCM+bytyping> starccm+

onthecommandlineintheUnixShell.Thenstartanewsimulationby

clickingonthenewiconandpressingenteratthebottomofthedialog.2. CreatetheGeometry.clickontheswitchnexttotheGEOMETRYiteminthe

sidebartoexpandit,andthenrightclickon3D-CADmodelsandselectNEW

fromthemenu.

3. Wewillnowcreateablockinthex-yplanemeasuring100mmwide(x)and

10mmtall(y)and10mmdeep(z)withthebottomleftcornerat(0,0,0),we

firstconstructasketch,byselectingthecorrectplane(xy)andrightclicking.

Thispanelcontainsthetoolsforcreatingsketchentities,suchaslines,circles

andarcs,andallowsyoutocontrolthesettingsforthegriddisplayedinthescene.EachsketchplanehaslocalXandYaxeswhicharedeterminedbythe

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positionandorientationoftheplaneinrelationtotheglobalcoordinate

system.

3.1Alignthesketchplanewiththeplaneofthescreen,byclickingontheLicon

3.2 clickonthesketchandgridspacingbuttonandchangethegridspacingto0.001mandclickOK3.3Nextmaximisetheviewbyclickingontheresetviewiconinthetool

bar.

3.4Nowchoosetherectangletool,anddrawarectangleinthemiddleofthescreen.Byrightclickingonthelines,youcanaddthelengthconstraints

tothemiftheseareexposedthedimensionsoftheboxwillbedisplayed.

3.5Chooseacornerpoint(bottomleft)andsetitspositionto(0,0)nowhitOK

3.6ClickonSketch1andtherightclickandselecttheextrudemenu,extrudingtheblock0.01m.

3.7ExpandtheBodieslist,andselectBody1changingitsnametoFluid3.8Thefinalstageinpreparingthemodelgeometryistospecifytheinlet

andoutletfacesofthemodelbysettingfacenames.Whenthe3D-CADmodelisimportedintothesimulationviageometryparts,facesthathave

beennamedwillbedefinedasseparatepartsurfaces.Therefore,when

thegeometryisassignedtoanewregion,thesesurfacescaneasilybecomeseparateboundaries.

Rotatethemodelsothattheleftendoftheductisvisible.Right-clickontherectangularfaceandselectRename,callingitInlet

NowRotatethemodelagainsotherightendoftheductisvisible,

renamingitOutlet3.9Close3DCAD

4. The3D-CADmodelisusedinasimulationbyfirstusingittocreateanewgeometrypart.Right-clickontheGeometry>3D-CADModels>3D-CADModel1andselectNewGeometryPart

5. Thenextstageistoassigntheparttoanewregion.Right-clickontheParts>FluidnodeandselectSetRegion>New...IntheNewRegionfromParts

OptionsdialogsettheBoundaryModetoOneboundaryperpartsurface

andclickOK.6. Right-clickontheScenesnodeandselectNewScene>Geometry.Expand

theRegions>Fluid>Boundariesnodeandselecteachoftheboundary

nodestocheckthattheyhavebeenspecifiedcorrectly.7. GeneratingaMesh-Apolyhedralmeshwillbeusedtoanalyzetheflow

patternsinpipe.Asthepurposeofthistutorialistodemonstratethemethodologyforrunningacaseusing3D-CAD,theprismlayermesherwill

notbeusedandthemeshgeneratedwillberelativelycoarse.Open

Continua.HereyouwillfindthemeshingandPhysicsoptions.7.2RightClick(RC)onMesh1>SelectMeshingModels7.3 Selectsurfaceremesherandtrimmer.Thiswillcreatearectangulargrid.

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7.4NowopenMesh>ReferenceValues.Set7.4.1 basesizeto10mm(widthoftheinlet)7.4.2 MaximumCellSizeto10%

7.5NowselectMesh>VolumeMeshfromtheMESHmenu7.6RCScenes>NewScene>Meshwillbringupanotherwindowinwhichyou

canexaminethemesh.7.7 Savethesimulationaschannel3D

8. Creatingthe2dmeshandconditions

Notethatthereisnogoingbackatthisstage.Thatswhyyousavedthe3Dexample.

8.2ClickonMesh>Convertto2D8.3Usethemouseyouwillseethattheobjectcannolongerberotatedin

3D

9. Settingupthephysicsmodelandvalues

Herewewillchoosethelaminarflowsimulation,thesolvertypeandthefluid(water)inthepipe.

9.2OpenContinuaandRCPhysics12D>SelectModels.9.3 SelectLiquid,Segregated,SteadyState,Laminar,Constantdensity9.4OpenthenewModelslist.Checkthatthefluidiswater.9.5 Settheinitialvelocityto[0.05,0.0,0.0]9.6Regions>Body12D>Boundaries>Inlet,selectavelocityinletandthenset

theValueoftheVelocitymagnitude(inConstant)to0.05m/s.9.7Regions>Body12D>Boundaries>Inlet,selectapressureoutlet.9.8OpenthelistStoppingCriteriaandsetthemaximumnumberof

iterationsto100.9.9 Saveaschannel2D

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10.Runthesimulation

11.Visualisetheflow,usingscalarandvectorscenes

11.2 isitright?11.3 -isafinergridneeded?11.4 howdoesitcomparetotheanalyticalsolution?

ForamorecomplicatedexampleofsettingupageometryfollowtheCyclone

SeparatorTutorialexamplefromthe3D-CADtutorialsinthetrainingguide.

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