|March 11, 2010, 04:22||
??negative drag coefficient when flowstream velocity is at zero
Join Date: Jun 2009
Posts: 3Rep Power: 7
I came across negative coefficient when simulating airfoil flapping motion using dynamic mesh.
My case is:
1.airfoil with flap at the trailing edge,no gap between the main airfoil and the flap,with the flap deflection angles ranging from 0~15.the whole airfoil does the flapping motion.
2.zero freestream velocity
k-e viscous model(RNG,enhanced Wall);velocity=0 when setting the velocity in boundary conditions.
when it converged,I do find the airfoil flaps as I expect but it also destroy the grids around it.Besides,the amount of Cl and Cd(negative) I got is 10 times less than experiment datas.
Can anyone give some advice?
|Thread||Thread Starter||Forum||Replies||Last Post|
|lift & drag coefficient on airfoil||n. natik||FLUENT||7||December 17, 2009 08:30|
|Automotive test case||vinz||OpenFOAM Running, Solving & CFD||98||October 27, 2008 09:43|
|drag and lift coefficient||Noé||CD-adapco||5||July 13, 2004 10:21|
|drag coefficient||Jean||FLUENT||14||November 4, 2002 03:49|
|Terrible Mistake In Fluid Dynamics History||Abhi||Main CFD Forum||12||July 8, 2002 09:11|