Geometry

In the Workbench window, double-click Fluid Flow (FLUENT).

Geometry

Rename this project by clicking in the bottom of the Fluid Flow (FLUENT) box.

Geometry

Click to highlight Geometry in the Fluid Flow (FLUENT) box and change Analysis Type to 2D.

Geometry

Right-click the Geometry icon and click New Geometry.

Geometry

Select Units to be Inches.

Geometry

Left-click XYPLANE to highlight it and click New Sketch icon.

Geometry

Click Sketching tab and sketch a rectangle around the origin.

Geometry

Draw a circle centered at the origin.

Geometry

Click on the Dimension>Horizontal tab and dimension the rectangle to be 26.25” from the y-axis and 96.25” in total length.

Geometry

Click on the Dimension>Vertical tab and dimension the rectangle to be 43.75” from the x-axis and 87.5” in total height.

Geometry

Click on the Dimension>Diameter and dimension the circle to be 3.5”.

Click on the Generate tab.

Geometry

Click to highlight the XYPlane and click on the New Sketch icon.

Draw a circle over top of the first circle with the same dimensions.

Click Generate.

Geometry

Concept>Surfaces from Sketches.

Geometry

Under Details View, change Surface From Sketches to Surface Sketch 1 and Operation to Add Frozen.

Geometry

Concept>Surfaces from Sketches.

Geometry

Under Details View, change Surface From Sketches to Surface Sketch 2 and Operation to Add Frozen.

Geometry

Under the Tree Outline, expand the 2 Parts, 2 Bodies (click on the plus sign), and left click the first Surface Body.

Under Details View, change Sketch 1 Fluid/Solid to Fluid.

Geometry

Under the Tree Outline, expand the 2 Parts, 2 Bodies (click on the plus sign), and left click the second Surface Body.

Under Details View, make sure that Sketch 2 Fluid/Solid is set to Solid.

Geometry

File>Save Project As> ‘Flow Over a Cylinder’.

Mesh

Under Outline, click Mesh. Change Relevance to 80.

Mesh

Under Details of “Mesh”, set Use Advanced Size Function to On: Proximity and Curvature, Relevance Center to Fine, Initial Size Seed to Active Assemble, Smoothing to Medium, 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.

Mesh

Under Details of “Mesh”>Inflation, change Use Automatic Tet Inflation to None, Inflation Option to Total Thickness, Number of Layers to 2, Growth Rate to 1.2, Maximum Thickness to 1 m, Inflation Algorith to Pre, View Advanced Options to Yes, Collision Avoidance to Layer Compression, Fix First Layer to No, Gap Factor to .5, Maximum Height over Base to 1, Growth Rate Type to Geometric, Maximum Angle to 100, and leave all other settings at Default values.

Mesh

Under Details of “Mesh”>Statistics, change Mesh Metric to Skewness.

Mesh

Click the Mesh tab at the top of the screen and select Generate Mesh.

Mesh

Mesh

Under Details of “Mesh”>Statistics>Max (Skewness), check that Max Skewness is less than .7.

Mesh

Mesh

Under Outline, click Mesh>Insert>Method.

Mesh

Under Outline, click Mesh>Insert>Mapped Face Meshing.

Mesh

Under Details of “Mapped Face Meshing”, change Geometry 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.

Mesh

Your new mesh should look like the picture above.

Mesh

Check the Max Skewness and make sure that it is less than .7.

Mesh

Click the edge selection tool and left-click the left side of the rectangle. Right-click>Create Named Selection.

Mesh

Name this line “velocity inlet”.

Click OK.

Mesh

Click the edge selection tool and left-click the right side of the rectangle. Right-click>Create Named Selection.

Mesh

Name this line “pressure outlet”.

Click OK.

Mesh

Click the edge selection tool and left-click the inner circle. Right-click>Create Named Selection.

Mesh

Name this line “cylinder”.

Click OK.

Mesh

File>Save Project.

Setup

In the Workbench window, right-click Setup>Edit.

Setup

The FLUENT Launcher will appear.

Leave all default setting as they are and click OK.

Setup

Under Problem Setup>Models, change Viscous to k-epsilon.

Setup

Under Problem Setup>Materials, check that fluid is set to air and solid is set to aluminum.

Setup

Under Problem Setup>Boundary Conditions, click cylinder and set Type to wall.

Setup

Under Problem Setup>Boundary Conditions, click interior-surface body and set Type to interior.

Setup

Under Problem Setup>Boundary Conditions, click interior-surface body.1 and set Type to interior.

Setup

Under Problem Setup>Boundary Conditions, click pressure_outlet and set Type to pressure-outlet.

Setup

Under Problem Setup>Boundary Conditions, click surface_body-surface_body and set Type to wall.

Setup

Under Problem Setup>Boundary Conditions, click velocity_inlet and set Type to velocity-inlet.

Click Edit.

Setup

Change Velocity Magnitude (m/s) to 20.12.

Click OK.

Setup

Under Problem Setup>Boundary Conditions, click wall-surface_body-surface_body and set Type to wall.

Setup

Under Problem Setup>Reference Values, change Compute from to velocity_inlet, Area to .006207167, Depth to .0889, Length to .0889, Velocity to 20.12, and Reference Zone to surface_body.

Setup

Under Solution>Solution Methods, change Momentum, Turbulent Kinetic Energy, and Turbulent Dissipation Rate to Second Order Upwind.

Setup

Under Solution>…>Drag Monitor, check the boxes next to Print to Console and Plot and select cylinder under Wall Zones.

Setup

Under Solution> Solution Initialization, set Compute from to velocity inlet and X Velocity to 20.12.

Click Initialize.

Setup

Under Solution>Run Calculation, change Number of Iterations to 1000.

Click Calculate.

Setup

Under Results>Graphics and Animations, click Contours and Setup.

Change Contours of to Pressure: Total Pressure, change Levels to 20, and check the box next to Filled.

Click Display.

Setup

Setup

Under Results>Graphics and Animations, click Contours and Setup.

Change Contours of to Velocity: Velocity Magnitude, change Levels to 20, and check the box next to Filled.

Click Display.

Setup

Setup

Under Results>Graphics and Animations, click Contours and Setup.

Change Contours of to Velocity: Stream Function, change Levels to 20, and check the box next to Filled.

Click Display.

Setup

Setup

Under Results>Graphics and Animations, click Contours and Setup.

Change Contours of to Velocity: Vorticity Magnitude, change Levels to 20, and check the box next to Filled.

Click Display.

Setup

Setup

Under Results>Graphics and Animations, click Vectors and Setup.

Change Vectors of to Velocity, Color by to Velocity: Velocity Magnitude and change Scale to 1 and Style to arrow.

Click Display.

Setup