Coefficient of lift for Simple Airfoil

Gohan · May 15, 2017, 03:34

Hi..
I'm doing a cfd analysis of a 3d airfoil under a specific inlet velocity via fluent.
I did the simulation for two different airfoils the only difference being that one airfoil is geometrically scaled by a factor of 100. But the coefficient of lifts of both the models are different by an order of e05, with the upscaled airfoil having a larger lift coeff. The wind speed, parameters, airfoil shape are all exactly the same. The only difference is that one is scaled. I don't understand why I'm getting a different lift coefficient. I don't know what i'm doing wrong.

Please Help.
Original(B).jpg
Scaled(D).jpg

quasimodo · August 9, 2017, 15:26

Hi Gohan,

Could you find a solution for your problem? Because I have similar problem, and I'm still looking for any reason for what could cause that much difference.

May 15, 2017, 03:34	Coefficient of lift for Simple Airfoil	#1
Gohan New Member Paritosh Join Date: May 2017 Posts: 1 Rep Power: 0	Hi.. I'm doing a cfd analysis of a 3d airfoil under a specific inlet velocity via fluent. I did the simulation for two different airfoils the only difference being that one airfoil is geometrically scaled by a factor of 100. But the coefficient of lifts of both the models are different by an order of e05, with the upscaled airfoil having a larger lift coeff. The wind speed, parameters, airfoil shape are all exactly the same. The only difference is that one is scaled. I don't understand why I'm getting a different lift coefficient. I don't know what i'm doing wrong. Please Help. Original(B).jpg Scaled(D).jpg

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August 9, 2017, 15:26		#2
quasimodo New Member Join Date: Apr 2017 Posts: 3 Rep Power: 9	Hi Gohan, Could you find a solution for your problem? Because I have similar problem, and I'm still looking for any reason for what could cause that much difference.