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jack1980 January 18, 2013 03:50

XFOIL: number of digits in output
Hi, is it possible to increase the number of digits in the polar output values of CL, CD, and CM? I think I did this once, but really can't remember how ...

Thanks for your help!

truffaldino January 19, 2013 13:50

Increasing number of digits in x-foil does not make sense, since, even with standard number of digits, errors related with methods applied exceed truncation errors by orders of magnitude.

jack1980 January 19, 2013 15:19

Thank you very much for your reply. I guess I should have mentioned that I'm asking this because I would to see if I can increase the smoothness of sensitivities, calculated from finite differences.

luigi22 October 11, 2016 05:10

I have to calculate Cl Cd for different type of airfoils to vary the angle of attack (alpha), I do in this way:
visc 100000
iter 1000
alfa 0
pacc naca0018.pol
aseq -30.0 30.0 2.0
The results are different from the results of wind tunnel, maybe cause the large variation of alpha. what do you think?

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