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  • FLUENT - Flat Plate Boundary Layer - FLUENT Post Processing

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It is of interest to compare the numerical skin friction coefficient profile to the skin friction coefficient profile obtained from the Blasius solution. In order to plot the theoretical results, first click here to download the necessary file. Save the file to your working directory. Next, go to the Solution XY Plot menu and click Load File... and select the file that you just downloaded, BlasiusSkin.xy. Lastly, click Plot in the Solution XY Plot menu. You should then obtain the following figure. Image Removed

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https://confluence.cornell.edu/download/attachments/118771111/SkinFric2_Full.png
Lastly, select Write to File located under Options in the Solution XY Plot menu. Then, click Write.... When prompted for a filename, enter SkinFriction.xy and save the file in your working directory.

Drag

Now, we will obtain the drag on the plate. First, click on Report then click on Result Reports..., as shown in the following image. Image Removed

newwindow Higher Resolution Image Higher Resolution Imagehttps://confluence.cornell.edu/download/attachments/118771111/Report_RR_Full.pngImage Added

Next, double click on Forces and click Print in the Force Reports menu. You should then obtain the following output in the command pane.

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newwindow Higher Resolution Image Higher Resolution Imagehttps://confluence.cornell.edu/download/attachments/118771111/ForceRep_Full.png

As one can see from the data above, the plate experiences a drag of approximately 0.008377 Newtons. Furthermore, the data states that the drag coefficient is approximately 0.01675. The drag coefficient is defined by the following equation.

In the case here, the density, viscosity and area all have values of 1. Thus, the equation above reduces to the following equation.

The results from ANSYS FLUENT agree with the theory here since the drag coefficient is approximately twice the value of the drag.

Now, save your work in the FLUENT window, then close the FLUENT window.

Go to Step 7: Verification & Validation

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