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Verification and Validation
Verification
One of the ways we can verify our data is by refining the mesh. Open up the mesh, and increase the Number of Divisions for Edge Sizing and Edge Sizing 2 to 100. Click Mesh in the Outline window, and in the Details window, expand statistics. The number of elements should now be 40000.
Exit out of the mesher. First, right click Setup and select Reset. Then click 
in the project schematic. Open up the solver, and solve the simulation using the same solver and boundary conditions (you'll have to input them again), but this time change the number of iterations to 5000. Again, calculate the force coefficients and graph the pressure coefficient.
Validation
To validate our data, we will take a compare the data from actual experiment.
|
Unrefined Mesh |
Refined Mesh |
Experimental Data |
|---|---|---|---|
Lift Coeffient |
0.6315 |
0.6670 |
0.6630 |
Drag Coefficient |
0.0122 |
0.0063 |
0.0090 |
Below is a graph displaying the comparing Coefficient of Pressure along the airfoil for the experimental data and the CFD simulation. The data is from Gregory & O'Reilly, NASA R&M 3726, Jan 1970.
Click here to see an enlarged image
As we can see from the table and the graph, the CFD matches the data fairly well. There are inaccuracies from factors like our assumption that the flow was inviscid, but we still managed to extract some meaningful information from the simulation.
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