Lift coefficent exactly 10 times smaller

- May 24, 2023 at 11:23 pm
  
  Marco Peviani
  Subscriber
  
  Hello everyone, I calculated the CL of a NACA 2410 in two different ways: in the first one I added the CL and CD from the report definition (the values are correct comparing them with the theory), with the second method I obtain CL through the Force_y in the Results, in this case the CL is exactly 10 times smaller than the exact value.
  Could you tell me what the problem is?
- May 25, 2023 at 12:51 pm
  
  Federico Alzamora Previtali
  Subscriber
  
  Hello Marco,
  how exactly are you extracting Cl in your second method? I note that P4 and P5 are unitless which is in line with Cl/Cd, while P3 and P6 have units of Newtons.
- May 25, 2023 at 12:54 pm
  
  Marco Peviani
  Subscriber
  
  This are the methods i used to calculate the coefficents. One is for the first method and one is for the other one. The one in the report definitions is right, the other one is divided by 10.
- May 25, 2023 at 1:05 pm
  
  Federico Alzamora Previtali
  Subscriber
  
  So how are you getting Cl/Cd from the force in CFD-Post? I suspect you are not using the same reference values. You can check the ones used by Fluent in Physics tab > Reference values

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