|August 15, 2011, 05:12||
Reason for Lift Coefficient Error
Join Date: Jul 2011
Posts: 3Rep Power: 6
I've been running some simulations for an airfoil at various angles of attack (up to 6 degrees) with properties;
Re = 1000, laminar model, second order density based solver, free stream velocity = 1 (varied viscosity to obtain Re).
I'm getting lift and drag coefficient errors of order 5-10%, which for what I'm doing is ample. However, my drag coefficient is much more accurate than my lift. I'm curious as to what mechanisms would cause this, as I would expect drag to have a greater error (due to difficulties in resolving boundary layer).
Is there anything in particular in a mesh or Fluent setup which would affect lift in this way?
On a side note, I've also noticed that my 3D tests (allowing wing tip effects) are much more accurate than my 2D. I didn't expect this either. My 3D models are simple swept face versions of my 2D ones.
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