# Calculation of lift and drag coefficients on airfoil

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 October 7, 2018, 09:40 #2 Member   carno Join Date: Mar 2009 Posts: 70 Rep Power: 17 I am also facing the similar problem. Lift and drag forces are very much under predicted. Question is, in case of 2D analysis, while calculating the Lift and drag forces, which area is considered? Is it, cord length * 1 (m)? Z direction = 1m? Or projected length based on angle of attack * 1m? Based on this one can adjust the results to the experimental data.

October 8, 2018, 04:32
#3
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Cyrille Bonamy
Join Date: Mar 2015
Location: Grenoble, France
Posts: 85
Rep Power: 11
Quote:
 Originally Posted by Carno I am also facing the similar problem. Lift and drag forces are very much under predicted. Question is, in case of 2D analysis, while calculating the Lift and drag forces, which area is considered? Is it, cord length * 1 (m)? Z direction = 1m? Or projected length based on angle of attack * 1m? Based on this one can adjust the results to the experimental data.
You can control these settings : https://www.openfoam.com/documentati...ce-coeffs.html

 October 10, 2018, 09:11 #4 Member   carno Join Date: Mar 2009 Posts: 70 Rep Power: 17 Thanks Cyrille, I found out the answer somewhere in the forum, that OpenFOAM takes the z actual thickness (x-y is the mesh plane) of the mesh while calculating the forces. I lost the link... If anybody finds it please share. Thanks.

 September 26, 2021, 17:58 #5 New Member   alireza Join Date: Sep 2021 Posts: 11 Rep Power: 4 Hi Cool . Excuse me, I wanted to know how you calculate the amount of lift and drag coefficients with OpenFoam itself. I am also working on Airfoil naca 63-415 and I encountered a problem to calculate the coefficient. Thank you for your help.

 September 27, 2021, 06:04 #6 Member     Cyrille Bonamy Join Date: Mar 2015 Location: Grenoble, France Posts: 85 Rep Power: 11 my old link doesn't work anymore... This one is good : https://www.openfoam.com/documentati...ce-coeffs.html

 Tags drag coefficient, lift coefficient