Imporving lift of an airfoil

mindprobe101 · September 3, 2020, 04:55

Me and my friends recenty learned Ansys FLuent and are trying to increase the lift generated by a standard airfoil by modifying the profile.
I have attached the original

and the modified profile

We did two simulations and used the following solver settings:
Model : Spalart
Method : Simple
Inlet velocity : 7m/s and 0.1 m/s(for the second simulation)

In case of First simulation(7 m/s inlet air) we got an improved drag(less than original) and improved lift (more than original) but for the second case (0.1 m/s) we got exact opposite results, i.e. lift and drag both were worse.

If anyone has any ideas where we might be going wrong are welcome to help.

Thank you

eshimshi · September 3, 2020, 11:24

It all depends if at different air speeds you get flow separation.
If you post pics. of the velocity contours it will be possible to tell.

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September 3, 2020, 11:24		#2
eshimshi New Member Join Date: Apr 2009 Posts: 9 Rep Power: 17	It all depends if at different air speeds you get flow separation. If you post pics. of the velocity contours it will be possible to tell.