ansyscfd流体分析实例.doc

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1、ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderExampleonusingcommercialsoftware“ICEMCFD5.1”FlowaroundacircularcylinderY.F.Lin77ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderTwoDimensionalproblemsFlowaroundacircularcylinderProblemDescriptio

2、nAirflowsacrossacylinderwiththeuniformvelocity0.003m/sinthewindtunnel.Thelengthofthewindtunnel(fluiddomain)has25mlongand10mheight.Thediameterofcylinderis1m.Wall(SideA)InletOutlet5DCylinderWall(SideB)Fluiddomain5D20DAssumptionandBoundaryConditions:1.2dimensionalproblems2.Steadys

3、tatecondition3.Theuniformflowvelocity4.NoHeattransfer5.Neglectthegravitationalforce6.ConstantairdensityPre-processingstageInthisstage,weimplementthe“ICEMCFD”toperformthepre-processingwork.Thebasicstepsasfollow:1.Establishgeometrymodel2.Blocktheparts3.GenerationtheOgrid4.Meshthe

4、modelandcheckqualityofmesh5.Extrudethemesh6.ResettheBC’s(boundaryconditions)7.OutputtoCFX5.7.1CreatingGeometry1.OpenICEMCFDDoubleClickthe“ICEMCFD”Icon,afterwards,youcanseetheinterfaceoftheICEMCFD.77ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderOpenFile>NewPr

5、oject…:77ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderSetthenamewith“cylinder_2d”,andClick“Save”2.CreatingGeometry:A.PointsClickbutton“CreatePoint”andthenclickbutton“ExplicitCoordinates”77ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderSet

6、thepointsinCartesiancoordinatesystem(X,Y,Z)with(X=0,Y=0,Z=0)respectively.Click“Apply”buttonandseethescreen:apointiscreatedAtreewidgetcanbeseenatleftofthescreen(A)and(B)Thesamemethodcreatesotherpoints:X=0;Y=0.5,-0.5X=-5;Y=5,-5X=20;Y=5,-5Y=0;X=0.5,-0.577ICEMCFDApplication–Compute

7、rSimulationofFlowaroundacircularcylinderA.Drawline(curve)Firstofallseethetreewidget,openModel>Geometry>PointsbyrightbuttonSelectShowPointNamesandyoucanseethenameofeachpointlikethefigureshowed.77ICEMCFDApplication–ComputerSimulationofFlowaroundacircularcylinderNowyoucancreatecur

8、vesClickbutton“Create/ModifyCurve”Clickbutton“CreateCu