getting too high aerodynamics coefficients for NACA747A315

singh22prashant · April 23, 2020, 11:27

Please help...
I used ICEMCFD for geometry creation and meshing of NACA747A315 with 120 mm chord length. The model was simulated using Fluent with inlet air velocity 75 m/s and 10 degree AOA. But the lift and drag coefficients came to be very high ( 780 and 65 respectively). Please refer the attached screenshots.

duri · April 23, 2020, 12:00

User correct reference values for coefficient calculation.

singh22prashant · April 23, 2020, 13:13

Quote:

Originally Posted by duri

User correct reference values for coefficient calculation.

As I'am new in CFD simulations, can you please tell me whats wrong in the reference values taken here? ( velocity was 77.49 m/s & not 75 m/s as mentioned in my query)

duri · April 23, 2020, 13:38

Can you put the screen shot of reference value panel

singh22prashant · April 23, 2020, 13:55

Quote:

Originally Posted by duri

Can you put the screen shot of reference value panel

here is the screenshot of reference values.

duri · April 23, 2020, 14:26

Reference values are correct. It means the forces are too high if the convergence and velocity field is fine then some thing could be wrong in units or mesh scaling.

April 23, 2020, 12:00		#2
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	User correct reference values for coefficient calculation. Chris2337 likes this.

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April 23, 2020, 13:38		#4
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	Can you put the screen shot of reference value panel

April 23, 2020, 14:26		#6
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	Reference values are correct. It means the forces are too high if the convergence and velocity field is fine then some thing could be wrong in units or mesh scaling.