Download - Unsteady Simulation
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Geometry
In the Workbench window, double-click Fluid Flow(FLUENT).
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Geometry
Rename this project by clicking in the bottom of theFluid Flow (FLUENT) box.
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Geometry
Click to highlight Geometry in the Fluid Flow(FLUENT) box and change Analysis Type to 2D.
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Geometry
Right-click the Geometry icon and click NewGeometry.
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Geometry
Select Units to be Inches.
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Geometry
Left-click XYPLANE to highlight it and click NewSketch icon.
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Geometry
Click Sketching tab and sketch a rectangle around the
origin.
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Geometry
Draw a circle centered at the origin.
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Geometry
Click on the Dimension>Horizontal tab anddimension the rectangle to be 26.25 from the y-axis
and 96.25 in total length.
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Geometry
Click on the Dimension>Vertical tab and dimensionthe rectangle to be 43.75 from the x-axis and 87.5 in
total height.
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Geometry
Click on the Dimension>Diameter and dimension thecircle to be 3.5.
Click on the Generate tab.
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Geometry
Click to highlight the XYPlane and click on the NewSketch icon.
Draw a circle over top of the first circle with the samedimensions.
Click Generate.
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Geometry
Concept>Surfaces from Sketches.
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Geometry
Under Details View, change Surface From Sketches toSurface Sketch 1 and Operation to Add Frozen.
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Geometry
Concept>Surfaces from Sketches.
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Geometry
Under Details View, change Surface From Sketches to
Surface Sketch 2 and Operation to Add Frozen.
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Geometry
Under the Tree Outline, expand the 2 Parts, 2 Bodies(click on the plus sign), and left click the first SurfaceBody.
Under Details View, change Sketch 1 Fluid/Solid to
Fluid.
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Geometry
Under the Tree Outline, expand the 2 Parts, 2 Bodies(click on the plus sign), and left click the secondSurface Body.
Under Details View, make sure that Sketch 2Fluid/Solid is set to Solid.
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Geometry
File>Save Project As> Flow Over a Cylinder.
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Mesh
Under Outline, click Mesh. Change Relevance to 80.
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Mesh
Under Details of Mesh, set Use Advanced Size Function toOn: Proximity and Curvature, Relevance Center to Fine,Initial Size Seed to Active Assemble, Smoothing toMedium, Transition to Slow, Span Angle Center to Fine,Curvature Normal Angle 1.6 degrees, Proximity Accuracy to.5, and leave remaining values at the default values.
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Mesh
Under Details of Mesh>Inflation, change Use Automatic Tet Inflationto None, Inflation Option to Total Thickness, Number of Layers to 2,Growth Rate to 1.2, Maximum Thickness to 1 m, Inflation Algorith toPre, View Advanced Options to Yes, Collision Avoidance to LayerCompression, Fix First Layer to No, Gap Factor to .5, Maximum Heightover Base to 1, Growth Rate Type to Geometric, Maximum Angle to 100,
and leave all other settings at Default values.
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Mesh
Under Details of Mesh>Statistics, change Mesh
Metric to Skewness.
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Mesh
Click the Mesh tab at the top of the screen and selectGenerate Mesh.
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Mesh
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Mesh
Under Details of Mesh>Statistics>Max (Skewness),
check that Max Skewness is less than .7.
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Mesh
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Mesh
Under Outline, click Mesh>Insert>Method.
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Mesh
Under Outline, click Mesh>Insert>Mapped FaceMeshing.
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Mesh
Under Details of Mapped Face Meshing, changeGeometry to the rectangle minus the inner circle(sketch 1) and Radial Number of Divisions to 100.
Click the Update icon at the top of the screen.
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Mesh
Your new mesh should look like the picture above.
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Mesh
Check the Max Skewness and make sure that it is lessthan .7.
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Mesh
Click the edge selection tool and left-click the left sideof the rectangle. Right-click>Create Named Selection.
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Mesh
Name this line velocity inlet.
Click OK.
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Mesh
Click the edge selection tool and left-click the rightside of the rectangle. Right-click>Create NamedSelection.
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Mesh
Name this line pressure outlet.
Click OK.
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Mesh
Click the edge selection tool and left-click the innercircle. Right-click>Create Named Selection.
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Mesh
Name this line cylinder.
Click OK.
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Mesh
File>Save Project.
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Setup
In the Workbench window, right-click Setup>Edit.
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Setup
The FLUENT Launcher will appear.
Leave all default setting as they are and click OK.
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Setup
Under Problem Setup>Models, change Viscous to k-epsilon.
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Setup
Under Problem Setup>Materials, check that fluid isset to air and solid is set to aluminum.
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Setup
Under Problem Setup>Boundary Conditions, clickcylinder and set Type to wall.
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Setup
Under Problem Setup>Boundary Conditions, clickinterior-surface body and set Type to interior.
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Setup
Under Problem Setup>Boundary Conditions, click
interior-surface body.1 and set Type to interior.
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Setup
Under Problem Setup>Boundary Conditions, clickpressure_outlet and set Type to pressure-outlet.
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Setup
Under Problem Setup>Boundary Conditions, clicksurface_body-surface_body and set Type to wall.
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Setup
Under Problem Setup>Boundary Conditions, clickvelocity_inlet and set Type to velocity-inlet.
Click Edit.
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Setup
Change Velocity Magnitude (m/s) to 20.12.
Click OK.
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Setup
Under Problem Setup>Boundary Conditions, clickwall-surface_body-surface_body and set Type to wall.
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Setup
Under Problem Setup>Reference Values, changeCompute from to velocity_inlet, Area to .006207167,Depth to .0889, Length to .0889, Velocity to 20.12, and
Reference Zone to surface_body.
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Setup
Under Solution>Solution Methods, changeMomentum, Turbulent Kinetic Energy, and Turbulent
Dissipation Rate to Second Order Upwind.
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Setup
Under Solution>>Drag Monitor, check the boxesnext to Print to Console and Plot and select cylinder
under Wall Zones.
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Setup
Under Solution> Solution Initialization, set Computefrom to velocity inlet and X Velocity to 20.12.
Click Initialize.
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Setup
Under Solution>Run Calculation, change Number ofIterations to 1000.
Click Calculate.
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Setup
Under Results>Graphics and Animations, clickContours and Setup.
Change Contours of to Pressure: Total Pressure,change Levels to 20, and check the box next to Filled.
Click Display.
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Setup
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Setup
Under Results>Graphics and Animations, click Contoursand Setup.
Change Contours of to Velocity: Velocity Magnitude,change Levels to 20, and check the box next to Filled.
Click Display.
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Setup
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Setup
Under Results>Graphics and Animations, click Contoursand Setup.
Change Contours of to Velocity: Stream Function, changeLevels to 20, and check the box next to Filled.
Click Display.
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Setup
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Setup
Under Results>Graphics and Animations, clickContours and Setup.
Change Contours of to Velocity: Vorticity Magnitude,change Levels to 20, and check the box next to Filled.
Click Display.
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Setup
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Setup
Under Results>Graphics and Animations, click Vectors andSetup.
Change Vectors of to Velocity, Color by to Velocity: VelocityMagnitude and change Scale to 1 and Style to arrow.
Click Display.
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Setup