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forceCoeffs lRef and Aref ??

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Old   March 18, 2016, 07:16
Default forceCoeffs lRef and Aref ??
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Hi guys, what is the value to put in lRref and Aref when i define forceCoeffs? From OF' s libraries I've see that lRef is referred to lenght scale for moment but I don't understand on what I have to base. And for Aref ?
P.S. I have an airfoil with a chord of 0.5459 m

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Old   March 18, 2016, 08:18
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and other question...the direction of drag is the opposite of flux, right? If this is true, for the tutorial airfoil2D because I have an angle of attack of 8 positive and then the y component of U is positive, the dragdir for me is (-cos8 -sin8 0). Is it right?
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Old   March 23, 2016, 04:40
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http://www.cfd-online.com/Forums/ope...lref-aref.html

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Old   July 9, 2024, 12:20
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Quote:
Originally Posted by giammy92 View Post
and other question...the direction of drag is the opposite of flux, right? If this is true, for the tutorial airfoil2D because I have an angle of attack of 8 positive and then the y component of U is positive, the dragdir for me is (-cos8 -sin8 0). Is it right?
Refer to the following illustration for direction vectors.

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Shishir G.
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