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Lift Hysteresis problem in Oscillating Airfoil

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Old   February 6, 2008, 16:01
Default Lift Hysteresis problem in Oscillating Airfoil
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Farid
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I have run a simulation for Alpha(t)=10+2sinwt. I got Cd hysteresis loop as the same as experimental but I got the Opposite loop for Cl. I am getting higher lift during the downstroke but it should be lower than that of upstroke.

Can anybody help me regarding this problem.

N.B. Airfoil is NACA0012, M=0.3, Re=0.54 Million.
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Old   February 6, 2008, 17:16
Default Re: Lift Hysteresis problem in Oscillating Airfoil
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Glenn Horrocks
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Hi,

Obviously you need to validate your model. Check mesh, timestep, convergence, physics, etc etc. It all needs to be correct to get an accurate answer.

Glenn Horrocks
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Old   March 28, 2012, 09:34
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Quote:
Originally Posted by Farid
;85907
I have run a simulation for Alpha(t)=10+2sinwt. I got Cd hysteresis loop as the same as experimental but I got the Opposite loop for Cl. I am getting higher lift during the downstroke but it should be lower than that of upstroke.

Can anybody help me regarding this problem.

N.B. Airfoil is NACA0012, M=0.3, Re=0.54 Million.
hello Farid, will you please tell me how to set the simulation in Fluent for hysteresis problem?I got no idea about the settings, such as the UDF,solution,boundary condition.
Thank you a lot!
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Old   March 29, 2012, 05:52
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Glenn Horrocks
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You are posting on the wrong forum. You are looking for the Fluent forum, this is the CFX forum.
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