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Author: John Singleton and Rajesh Bhaskaran, Cornell University
Problem Specification
1. Pre-Analysis & Start-up
2. Geometry
3. Mesh
4. Setup (Physics)
5. Solution
6. Results
7. Verification & Validation
Exercises
Discussion
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Numerical
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Results
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We will use CFD-Post as the primary post processing GUI. Steps for post processing in FLUENT can be found here. |
Exporting Skin Friction from FLUENT into the Post-processor (CFD-Post)
FLUENT calculates the skin friction coefficient as follows (see section 34.4 of the FLUENT User's Guide which is accessible from the "help" button on the FLUENT interface).
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Double click on Results from the Workbench Window to launch CFD-Post.
Velocity Vectors
Click on the z-axis,
to view the XY plane. Click on the vector icon to insert a vector plot. Name it Velocity Vector....
You can use the wheel button of the mouse to zoom into the region that closely surrounds the plate, to get a better view of the boundary layer velocities:
Pressure Contour
Insert > Contour. Name it Pressure contour.
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Click on Apply to view the contour.
Outlet Velocity Profile
We will create a line that corresponds to the x=1 line (outlet). Then the velocity along this line can be plotted against the Y axis. From the toolbar, insert > location > line. Name it "Outlet"
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Click on Apply. The comparison should look like the following plot:
Normalized velocity profile
We will observe the normalized velocity (u/U_infinity) at the outlet. Insert a point and call it free stream. The velocity at this point will be extracted and set to the free stream velocity (U_infinity). The velocity profile found in the previous step will be divided by U_infinity.
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Notice the scale of this profile is exactly the same as that of the outlet velocity profile. This is because the free stream velocity, Uinf, is 1 m/s.
Mid-Section Velocity Profile
Here, we will plot the variation of the x component of the velocity along a vertical line in the middle of the geometry. In order to create the profile, we must first create a vertical line at x=0.5m. Insert another line, same as the previous step, and name it Mid section. Enter the following numbers to create a vertical line at x=0.5m. Set the number of samples to 50. Remember to click on Apply to finish.
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The velocity profile comparison is shown below:
Skin Friction Coefficient
We can plot the skin friction coefficient imported from FLUENT as a function of distance along the plate. Insert a line and name it "plate wall". Enter the end points of the line and the number of samples as the following:
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You can export the skin friction coefficient for data manipulation.
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