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Author: John Singleton and Rajesh Bhaskaran
Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Setup (Physics)
5. Solution
6. Results
7. Verification and Validation
Exercises
5. Solution
Convergence Criterion: Turn off Drag, Turn on Lift
Solution > Monitors > Drag > Edit.... Then uncheck Print to Console and uncheck Plot. Click ok.
Solution > Monitors > Lift > Edit.... Then check Print to Console, Plot and Write. Click ok. The last option writes the lift coefficient data to a file that is buried in one of the subfolders that FLUENT creates in the working folder. You'll have to dig around to find it.
Solution Initialization
First, let's set the initial condition in all of the cells to a velocity of 1 m/s in the X-direction. Solution > Solution Initialization. Set Compute From to farfield1.. Click Initialize.
Next, we'll change the velocity in some of the cells to more quickly reach a sinusoidal variation of the lift coefficient. Adapt > Region....
Then set X Min to 0.5 m, set X Max to 32 m, set Y Min to 0 m, and set Y Max to 32m.
Click Mark then click Close. This will select the cells bounded by these four points, so we can change the initial condition in them.
Next, click Patch.
Complete the patching menu as shown below. This will change the initial Y component of velocity in the selected region from 0 to 0.2 m/s.
Click Patch,then click close.
Setting Up Data Export to Create Animation
We would like to create an animation of the vorticity magnitude after the solution has been calculated. To do so, we will need to export data from FLUENT to CFD-Post, the post processor used to view results. To do so, go to Solution > Calculation Activities > Automatic Export > Create > Solution Data Export....
Next, change File Type to CFD-Post compatible, as this is the program we will use for post processing. Then, select Vorticity Magnitude from the list of variables on the right, so we can make an animation of contours of vorticity. Finally, click Browse, and choose a convenient file location to place the data files. Make note of this location for later use.
Advance Solution in Time
Solution > Run Calculation. Set Time Step Size to 0.2 seconds and set the Number Of Time Steps to 400.
Now, click Calculate. (You may have to hit Calculate twice.) Now, have a cup of coffee. When complete, close FLUENT to return to the main project window.
Save Project
Go to Step 6: Results
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