ansys_cfd流体分析实例

1、Example on using commercial software“ICEM CFD ”Flow around a circular cyli nder8Two Dime nsional problemsFlow around a circular cyli nderProblem Descripti onAir flows across a cylinder with the uniform velocity s in the wind tunnel. The length of the wind tunnel (fluid domain) has 25mlong and 10 mhe

2、ight. The diameter of cylinder is 1mWall (SideA)5I5 /4d2WallFluidO utlet*doma in(SideB)Assumptio n and Boun dary Con diti ons:1. 2 dime nsional problems2. Steady state con diti on3. The un iform flow velocity4. No Heat tran sfer5. Neglect the gravitati onal force6. Con sta nt air den sityPre-process

3、i ng stageIn this stage, we implement the“ICEM CFD to perform the pre-processing work.The basic steps as follow:1. Establish geometry model2. Block the parts3. Gen erati on the O grid4. Mesh the model and check quality of mesh5. Extrude the mesh6. Reset the BC s (boundary conditions)7. Output toCrea

4、ti ng Geometry1. Ope n ICEM CFDDouble Click the the ICEM CFD.“ICEM CFD Iconafterwards, you can see the in terface ofOpe n FileNew ProjectSet the name with“cylinder_2d ” , and Click“ Save”2. Creati ng Geometry:A. PointsGeometryiMesh | 日locking Edk Mesh Output Rast-processingClick button“Create Poi nt

5、and the n click butt onExplicitCoord in atesCreate Point勺际points丁啊bw pointTooApplvOK匚nncelSet the poi nts in Cartesia n coord in ate system(X, Y, Z) with ( X=0, Y=0, Z=0) respectively.Click“ Apply ” butt on and see the scree n: apoint is createdA tree widget can be see n at left of the scree n (A) a

6、nd (B)The same method creates other points: X=0; Y=,X=-5; Y=5, -5X=20; Y=5, -5Y=0; X=,士 Fi-0 ri,/a 卢 r 凸厦陀凳I匚点沪P *wntaUaT BN.斗存9髀拮錨黑B. Draw line (curve)First of all see the tree widget, ope nModelGeometryPo ints by right butt onModel鴻 Sitisets 一bd Porilj* -IPart 5说 FOIhSelect ShowPoint Namesand you

7、can see the name of each poin t like the figure showed.Shov Large5howDornf)anShov Point NamesShow Point InfoBlank FantsR ename PaintNow you can create curvesGeorrietiy Mesh Elwkina LditMesh 曲期P 曲口 g 曲也Click buttonCurve ”“Create/ModifyCreafe/M odify CurvePot CURVES“Create CurveClick buttonNote: the l

8、eft corner of the black screen: Select locati ons with left butt on, middle=d one, right=ca ncel|CURVES.OOC reate CuiveFrom PointsP Ata work-plane selectionSelect points by using left butt on of themouse.Change the name of the Part with“INLET:馥ICreatc/Modify CurvePointe |Tolerance 10.001ClDQSU 日口P机

9、IlNLET陶ne INLETCancelJOINTS .06JOINTS. 0637A瓦JOINTS. 05“done”(B) and the INLET part is created inSelect and with left button (A),And draw a line with middle butt on the tree widget.一.b Model b GeometiM SubsetPointsj3 C un/es&ybd Paih 说 INLET-bfi =iniNTSThe same steps draw the curves n amed“OUTLET, S

10、IDEA, SIDES with the , and ,and respectively.We will see the line and the tree widgetIlA * * try 1. -pr 十E-FM 1 / JZ円IVXModelGecrnely諂 Subset 86 PoiriU说 Curves &t 站 Pacts63 INLET一苗 OUTLET Z PU NTS说 5IDEA3 irDraw the cyli nderClick button“Circle or arc from Center pointCreale/M odify Curveand 2 point

11、s on pla ne”Set the Part with name“CYLINDER咏归IDEEMama |8IDEECreate Curveand select pointsClick butt onwith left butt on respectively (A).Center -and 2 Point*ApplyCancelDraw the cyli nder by middle butt on (B).See tree widget:jfe ModelEH-t Geometry -漲Sub沁启 bd Poinh bd CurvesL fc3 Parts一山一曲 I KILE T 说

12、mbd POINTS 说 SIDEAClose Poi ntsn - b Model申 Gometrv濾 SubsetfoS Point?1)5 CurveShow LafQeE-rfc PartsShaw Dorm arilbd一bdINLEV Show Point N“i带曲ITShow Point Infofed POINBhnkPots说Renarrbe Paintbfi SIU_n ameUse butt on冈to fit the wi ndow.Creale BodySet the body and material.Geometry Mesh Blocking Edit Mes

13、h Output Post-processingMPZd聾辱目理xxax jCreate Bodly|Click buttonCreate BodyMdtofial PointLaeationAt specified point忖 Cenhaid af 2 pcjinte2 screen Hocalions |Choose butt on“ Material Pointselect “ Selected surfaces ” in theandApplyOKCancelTopology ” menu.“FLUID ; open the Show Point Name of the treewi

14、dget and useChange the n ame of the part withselect and .“CYLINDER and select andThe same way cha nge the part n ame withClose Show Point Name and open the tree widget:ModelM Subsetstd P$n请bd Curves 淞 Bedie -1 t3 Partsdisplay optionshA CYLin-ta FLUID 淞 INLET 一簡 OUTLET bd FH NFS bd SIDEA bd lF：FLUIDO

15、pen the bodies and you can seeAt last, open theFileGeometrySave Geometry As Give it the name with “ cylinder_2d ” . Click “ save ”Create BlockFait SOLIDG eometryMeshBlockingEdft MeshNow we beg in to block the model.rd/reale BlockClick button“Create Block ”,choose the part with“FLUIDSee the first one

16、“FLUID , from the pull downmenuselectAnd set the In itialize Blocks type with“2D PlanarType33Ehtitif2D2D PlanarInitialize Blocks： Orient 听th geometryClick“ Apply ” butt on.We will see that the colors of figure are cha nged. From(A) to (B)Model Gecmetiy 囲 Subsets 一说 Pohts bd Cujv&s 游 Podies b Blockin

17、g tid Subsets 諂 Vertices 品E dp號 Faces Blacks Pre-Mh Tocology-bd-bd FLUID 品INLET 曲 OUTLET-faa POINTS-fed SIDEA 谕I鴻 ERFNSee the tree widget:ModelBlocki ngThen create some assista nt points with butt on“Create Point ”Y=0x=, , , , , , , , , X=0丫=, , , , , , , , , Now beg in to block the regi onGaonetry

18、MeshBlockingEdit Mash Output PostprocessingClick button“Split BlockThen select butt on“Split BlockSplit BlockSpkt Blockr | SpliiElQickkcy - 7|0Split Method |Screen selectw|point.Use the butt on奁firstly select the EdgeSee the split method, select“ Prescribedpoint ”Use the put dow n menu to select the

19、 Prescribed“INLET and sec on dly select the Poi ntWe will see the block line in the verticaldirectio n of theINLET.A CM- mm. 址鼻 &亠七 LI 曾-pr .plf 呵Zoom the fiure.nioiThe same way we draw other block lines.From the “ toSee the tree widgetSelect the “Blocking ” and select“Index Control ”ModelBlock ing

20、: In dex Con trol(us ing right butt on of the mouse)i - b Model申-b Geometty 體 S uLseti S3 Pamh3 Curves滨 B odiesEbrfe) BlqgjIn CohItoIID I J K土：Setecl cornersQueip EdgeSet Lines WidthInit output blocks-ftfi Blocks诫 Pre-MeshWe can see at the right corner of the scree nRle$etBy using butt onandwe set I

21、 min=2 and see the figureThe same way we set I max =3 , J min=2 , J max=3And the scree n show n that? J .V h&a * 八，第吃 “)cThe same way block aga in fromto ” ：(A)(B)(C)_ 尸1吐严HAfvlRrs.3i JpOIHTE.a?-. Jwm 念、 RtHTSF J=c.IPTE.j|in tDtMT5.43【JWNTS.M1jDimra. 35I IRT5.13 J?&1CT5.?21J=CIbTT5.31 /ij1NT5.3iJvl.

22、2&抚IhT吒上. XiINTE-.i-? /IJME. LLi_UAfterSee the tree widget:ModelPartsVORFNusi ng the right button select“Add toPart ”Click buttonBlocki ng Material”Add Blocks to PartAdd to Parthame |ORFhAdd to PartBlocking MateriaL Add Blocks to ParBlocks |ApplvOIKCanceland wecanZoom the block regi ons (A).Select t

23、he blocks in the cylinder or attached the cylinder (B)(C).c7* H B |R ff ff 博9R*R0 0 MWIff H SZEEEEE2KEE需 Iff 冃 W W 静 L ffl SB B HODnnHSBRBIffBfflBrEIH inBBUBlmrlwwnwrri hf riT ma rrur triffWIPISPPMwffnr?厂 I RpsffDFFRonrcncCDDCInnnnrn口口nnccDonnonrnnnnni nnHnnnnannBH onoonnnnnnw nrcnnncnnOBH afFCfflan

24、ncnB n口 hjcnnn RECCDCOK and you can see blow (D).Using the middle butt on to set it“AssociateSelect the associate edge tocurveAssociateblocking AssociationsEdge to CurveUsing thebutt on? I choose the edge and curveEdfleh |燧Curve(s)Project vertksesAssociate Edge - CurveChoos ing edge:Select curves:Se

25、t O gridG eoTOtrv MeshBilkingEdit MeshDu卜 pQsirg“Split Block剑Click buttonClickSelect theOgird BlockI* Around blockfs)See the tree widget:Ope n ModelPartsVORFNOpen the VORFI(A)Using butt on(B)(C)(D).to selectE!lock|s)in or attached the cylinderCHi.晶1汕山*1BDMM跚黯劈 880888 89n88ffi8SBt nnnnnnnnnnnnnnncnnn

26、r aamgnmLJtjnoannonn 卩 nnicnootm nggonnnn nnnnnnonroj fcnopnnonngoo口口 goof Bflrin rin n nri rinrin 口 nnwp siBinnnncinnonnnDomN!Us ing middle butt on to click“ Apply ”(E)Close “VORFl” from the tree widget (F)imReset ”(G)Select corneis22+ I00s r:目ResetQuery EdgeDoneClick theMesh the edgesGeometry 恥命 B

27、locking I Edit Meh Output Post-processingCurve Mesh Size曾Curve Mesh Size Input NethoclClick button“Set Curve Mesh SizeI nput M eth od By S elected Cuiv&sFCGeometrypoints , and the ModelBlock in gedgesCm冏钊CYLINDERMethod广Ehmerit size Elemenl countMazifnum deviation |oReinesh adiacenl surfacesI npuil M

28、 eth od By S elected Cu livesUsing right butt on to selectModelGeometryCurves:Curve Node Spaci ng (by using right butt on)The same way set the “INLET” and “OUTLET with number 100, the “SIDEA and “SIDEB with nu mber 250.ElockirgEdit MoshPo 辑prawningParamsClick button“Pre-MeshParams”Pre-Meh ParamsMesh

29、ing ParametersRccakul ate SMethod Update Al汕ibuiozleep Ccurit?and keepChoose Block ing Pre-Mesh ParamsClick butt on “ Update Sizes default,The n click ApplySee tree open ModelBlockingPre_Mesh: Project faces (by using right butt on)And we will see a menuApplpOK.CancelClick Yes.* * 氓 i -y. d*Now we wi

30、ll see the mesh of the model.Ie ii 、F P *Hhi hdbJbmbbi H*a g 】M 書 Poi nts and curves , and Block in gEdges .Then open FileMeshLoad from BlockingOpen FileMeshSave Mesh As ：and set the name with“cylinder_2d ”Open FileBlockingSave Blocking As ：Save block with the name“cylinder_2dCheck the quality of th

31、e meshG ecxnetry Mesh Blocking EditM 强h Output Fast-processing fifl 妙庆第 WClick buttonDisplay Mesh QualityQudity MlcbiciMlsh to chokYesClick ApplyWe can see no n egatives mesh.Llefrenls Lo check0 All 宀 Active pert*i ViiibeQuattj tvpcCriterion(Q unityT曲mjIuOTCanedExtrude meshGewnetry 恥砧 Blocking Edit

32、Mesh Output Post-processing逼n & 盂够鑛鋼Exgdu M京hClick button“Extrude MeshUseto selectEleme nts:Method 1Method 247Click butt on“ Select items in a partClick“All ” and “Accept ”启 dand a menu appears:Put the leftbutt on and drag it to select allthe regio ns (A)(C) . Click middle buttonto accept (B)Give th

33、e New volume part name“FLUID2D , new side part namepar n ame “ TOPAnd set the Spacing typespacing with “” , then Apply“SIDE , new topEiitradv Methloo 闻it nameExtrude methEteimentsNew a lie pdit ridnmMethod EKliude Blenrent nccmrialExhude B# Ekment NoiHvdlNumber of L=rsSpacing tvpe忙 FiKed 厂 FincHmS p

34、nauiiiiy djdAppiy匚 KCainzelSo the mesh cha nge a height in theZ directio n (D)53I* H JPJ A : 1 * “F If1 衬 E-FD-lEwBox ZoomClick butt on“Shaded Full DisplayCheck the quality of the extrude mesh歸 FLUID 2dFLUIDbd INLET 筑 OUTLETfad FdlJ S-bd SIDE 一说 SDEA!:IDFF bd TOPMVORFNVORFNTOPSee the tree widget:b M

35、odel泌 GeornetiiJ 滅 Subsets M Points 一諂 Curves 游 Bodesrb Mesh& Blocking_i S PattrCVLINI沁Close top“ TOP (B)Model窗 Geornetiy1bd Subsets 鴻 Points &6 Curves 潴 Bodies 申哈Mesh 0Blgckrig El-电 PrtsPbd CYLINDERFLUID 曲 FLUID2D 閔INLET 閔 LU Lzl 一閔 POINTSSIDE一询 SI DEA k-bd SIDESClose “FLUID (C)丄-务ModelGecmetry feS

36、 $vb誨炖 輻 Points澱 Curves菌 BodiesMesKBlockingParU-td-fed FLUID 2DM INLET-1&3 OUTLET 一閔 POINTSFLUID SIDE说 SIDEA-63 SIDI 昭 TOF 滋 VORFWSet the new boun dary con diti onsSee the tree widget:ModelParts: Create Part (by using the right butt on)Click“Create Part by Selecti on”butt onFrom the pull dow n menu

37、of the Part: select the “ CYLINDERand left butt on drag the regi onUsi ngAUsing middle butt on accepts it, so a new CYLINDEFbou ndarycon diti on has bee n set (C).The same way set the INLET, OUTLET SIDEAand SIDEBboundary conditions.INLET74The Whole Boun dary Con diti onsit ii r iFh E# 中1 IrtqiHf*鼻眷回

38、JB席砌13毀鱼臺户、特鼻暮See the tree widget:Model-胡 Subsets幅 Points-胡 Cuives -昶 Bodies ft Mesh ft Blocking ft Parfe 一说FLUID-to FLUID2D 说 INLET J.TLET-to POINTS閔 SIDEZ SIDEA-W SIDI 爲TOP 豁 VURFNOpe n ModelPartsFLUID(B)Fl-rb Model诫 Pohts 滨 Cure?澱 Dodo.Mesh Block ng ParitFLLID-66 Fl I ID2D fad INLET-bS-fed POINT

39、fad SIDE 一苗 SIDEA fad SIC 说TOP 決 VOHFNOpe n ModelPartsTOP(C)Fl-rS Model 淤 Geomatrv迢 Points 一胡 Curve? 福 RndiHs Mesh Sleeking Parts： CTLINDEFI FLUID FLUIDS INLET outlet POINTS SD? SDEA咕扁询迫m3迫5曲 _r&- tMthblbibibiTOPVORFNSix kinds of patter nsClick FileMeshSave Mesh As And save the new mesh with n ame“

40、cyli nder_2d_extrudeOutput the mesh file to CFXGeometv Mesh Blocking Edit Mesh ClMpd PoEt-processingClick butt on “ Select solverand choose“CFX 5”Select ion|CF5AiftoMAttila DAGGERC-blOLDCFD+ CFDRC-DTFCFL2DCR4CFX-5kajj寓CancelClick“Oka?Click button“Write inputThen the Doma in select ion appearsKeep default and clickDo ndDomain selectionDomain selectionSelect an unstructured domain.The boK ftlsd Selected domains contains the domains selected.To add a domain to thii list, c