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Airfoil post processing

  • Drag co-efficient Vs Angle of Attack
  • Lift co-efficient vs Angle of Attack

are the two requirements for completion of the airfoil assignment. I believe angle of attack can be varied by changing the velocity vector components in the inflow boundary conditions. However, how does one get the values of lift and drag forces and subsequently the co-efficients from the output files? Do we have to enable any extra variables specifically for this case in the post.in file?