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1、ICEM CFD Application Computer Simulation of Flow around a circular cylinderExample on using commercial softwareFlow around a circular cylinderY.F.LinTwo Dimensional problemsFlow around a circular cylinderProblem DescriptionAir flows across a cylinder with the uniform velocity 0.003m/s in the wind tu
2、nnel. The length of the wind tunnel (fluid domain) has 25m long and 10 m height. The diameter of cylinder is 1m.Wall (SideA)InletOutlet5DCylinderWall (SideB)Fluid domain5D20DAssumption and Boundary Conditions:1. 2 dimensional problems2. Steady state condition3. The uniform flow velocity4. No Heat tr
3、ansfer5. Neglect the gravitational force6. Constant air densityPre-processing 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. Generation the O grid4. Mesh the model and check quality of mesh
4、5. Extrude the mesh6. Reset the BCs (boundary conditions)7. Output to CFX5.7.1 Creating Geometry1. Open ICEM CFDDouble Click the “ICEM CFD” Icon, afterwards, you can see the interface of the ICEM CFD.Open FileNew Project: Set the name with “cylinder_2d”, and Click “Save”2. Creating Geometry:A. Point
5、sClick button “Create Point” and then click button “Explicit Coordinates”Set the points in Cartesian coordinate system(X, Y, Z) with ( X=0, Y=0, Z=0 ) respectively.Click “Apply” button and see the screen: a point is created A tree widget can be seen at left of the screen (A) and (B) The same method
6、creates other points:X=0; Y=0.5, -0.5 X=-5; Y=5, -5X=20; Y=5, -5 Y=0; X=0.5,-0.5 B. Draw line (curve)First of all see the tree widget, open ModelGeo-55metryPoints by right buttonSelect Show Point Names and you can see the name of each point like the figure showed.Now you can create curves Click butt
7、on “Create/Modify Curve” Click button “Create Curve” Note: the left corner of the black screen: Select locations with left button, middle=done, right=cancelSelect points by using left button of the mouse.Change the name of the Part with “INLET”: Select PONITS.05 and POINTS.06 with left button (A),An
8、d draw a line with middle button “done” (B) and the INLET part is created in the tree widget.The same steps draw the curves named “OUTLET, SIDEA, SIDEB” with the POINTS.07and POINTS.08, POINTS.06 and POINTS.07, POINTS.05 and POINTS.08 respectively.We will see the line and the tree widget Draw the cy
9、linderClick button “Circle or arc from Center point and 2 points on plane”. Set the Part with name “CYLINDER”Click button and select points “POINTS.00, POINTS.01, POINTS.03” with left button respectively (A). Draw the cylinder by middle button (B).See tree widget:Close Points nameUse button to fit t
10、he window.Set the body and material. Click button “Create Body”Choose button “Material Point” and select “Selected surfaces” in the “By Topology” menu.Change the name of the part with “FLUID”; open the Show Point Name of the tree widget and use select POINTS.06 and POINTS.08.The same way change the
11、part name with “CYLINDER” and select POINTS.01 and POINTS.02.Close Show Point Name and open the tree widget:Open the bodies and you can seeAt last, open the FileGeometrySave Geometry AsGive it the name with “cylinder_2d”. Click “save”. Now we begin to block the model. Click button “Create Block”See
12、the first one , choose the part with “FLUID”, from the pull down menu select “FLUID”And set the Initialize Blocks type with “2D Planar” Click “Apply” button. We will see that the colors of figure are changed. From (A) to (B)See the tree widget: ModelBlockingThen create some assistant points with but
13、ton “Create Point”Y=0 X=-0.45,-0.4,-0.35,-0.3,-0.25,-0.2,-0.15,-0.1,-0.5, 0.5, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45X=0 Y=-0.45,-0.4,-0.35,-0.3,-0.25,-0.2,-0.15,-0.1,-0.5, 0.5, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45Now begin to block the region Click button “Split Block” Then select button
14、“Split Block” See the split method, select “Prescribed point”Use the put down menu to select the Prescribed point, Use the button firstly select the Edge “INLET” and secondly select the Point “POINTS.03”.We will see the block line in the vertical direction of the INLET.Zoom the fiure.The same way we draw other block lines.From the “POINTS.01 to POINTS.04” See the tree widgetSelect the “Blocking” and select “I
