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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

Numerical

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Results

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.

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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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