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-   -   Drag (http://www.cfd-online.com/Forums/fluent/118788-drag.html)

ashishtbm June 4, 2013 09:20

Drag
 
I am simulating a 2D naca 0012 airfoil under invsid conditions but I am getting positive drag which should e ideally zero for inviscid case and streamline should turn at the trailing edge to up surface.
Even cylinder also ideally gives zero drag under inviscid conditions.
So, why fluent is giving pressure drag under inviscid conditions?

oj.bulmer June 4, 2013 10:43

Is it close to zero or larger. It will never be exactly zero.

OJ

ashishtbm June 4, 2013 13:53

my drag coefficient value at 4 degree angle of attack is 1.55e-3 and for cylinder it is around 1.2.
Does this value seems right for the inviscid case?
At higher angle of attack, flow even separates which should never occur for inviscid case.


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