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March 1, 2012, 09:27 |
Airfoil Pitching
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#1 | |
Member
sheth roh
Join Date: Jul 2011
Posts: 56
Rep Power: 14 |
Hi,
I am performing airfoil Pitching in fluent. The pitching is simple harmonic and is about the centroid. From diagram you can see that pitcing is about z axis. Here is my udf Quote:
Can you tell whats wrong with code. ? Note: I only set dynamic mesh zone in airfoil(So DO I need to set other zones too?) I have tried setting 6 DOF on and off but in both case it doesnt work. |
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March 9, 2012, 09:26 |
Airfoil Pitching Problem
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#2 |
New Member
Saif Ullah
Join Date: Aug 2011
Posts: 10
Rep Power: 14 |
You should add following commands to the udf. Don't use omega[2] simply. I hope it will work. Set only your airfoil as dynamic zone and give CG absolute coordinates in creating dynamic zones. You airfoil should start rotating about that point.
daft = (60 * (pi/180)) * 2*pi*0.2 * sin(2*pi*0.2 * time); alpha = 60 * cos(2*pi*0.2 * time); /* set omega */ omega[2] = daft; Regards |
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March 11, 2012, 02:17 |
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#3 | |
Member
sheth roh
Join Date: Jul 2011
Posts: 56
Rep Power: 14 |
Quote:
I will definitely try this code. Meanwhile can you please tell me if the following setting are correct for dynamic mesh: - I am giving motion via define_cg_motion - I set moving zone only to the airfoil, I consider it rigid and provide motion via udf. SO DO I NEED TO SET OUTER REGION AS DEFORMING - I set only smoothing and remshing not layering. - Also when I use prism mesh around airfoil, it always gives negative volume. SO for such mesh what settings should be made. I really appreciate your help. Regards |
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