Hello Everyone ,
I am simulating a 3D airfoil in fluent . The results I am getting for lift coefficient are within 5% error limit of the experimental values .
However , the results for drag coefficient are significantly lower than the experimental results .
I have read in literature that this under-prediction of drag coefficient is due to the lift induced drag in experimental results and that CFD does not account for lift induced drag . Is it true ?
In the case of the 3D wing, you will certainly capture the induced drag. It is important to have a computing domain that is large enough so that the distance to the boundaries is sufficient to reduce its influence on the solution around the wing.
As the colleagues answered you, I would just add that, You have to write a short script in FLUENT to calculate the lift induced drag value. FLUENT computes the forces in all directions and out of them you could extract whatever you want.
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