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Low Lift Coefficient in ground simulations of 2D Airfoil (URGENT)

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Old   April 7, 2021, 05:56
Default Low Lift Coefficient in ground simulations of 2D Airfoil (URGENT)
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Umayr
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Hi there, I am university student and in major need of help. I'm running 2d simulations on a 30P30N Airfoil which I've simulated in free flight and now I have run in ground simulations with a h/c of 1. My lift values for ground are lower than my free flight simulations for whatever reason and I cannot figure it out despite many changes. Can anyone assist? These are my results:


FREE FLIGHT
Alfa CL - CD - CM
0 - 2.1414 0.050072 0.22063
4 - 2.6703 0.050454 0.09339
8 - 3.1056 0.064482 -0.03591
12 - 3.3856 0.093385 -0.16095

IN GROUND
Alfa CL - CD - CM
0 - 2.0035 0.044599 0.20268
4 - 2.3253 0.036799 0.07713
8 - 2.6291 0.052558 -0.04001
12 - 2.8262 0.079061 -0.14552

I've attached some pictures of basic settings/reference values:
Screenshot 2021-04-07 at 10.52.49.jpg

Screenshot 2021-04-07 at 10.53.22.jpg

Screenshot 2021-04-07 at 10.53.50.jpg

I would really appreciate some urgent help as my degree depends on it. Thank you so much for your time.
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Old   April 7, 2021, 06:02
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Umayr
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A couple more settings

Screenshot 2021-04-07 at 11.00.40.jpg

Screenshot 2021-04-07 at 11.01.14.png
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Old   April 25, 2021, 04:51
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Venkat
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How does your mesh settings look like?
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2d airfoil, 30p30n, ansys, ground effect

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