I've conducted some numerical simulations of a pitching airfoil at three different locations of the pitching axis along the airfoil. The locations (from the leading edge of the airfoil) are: $0.25c$, $0.4c$, and $0.75c$. where $c$ is the chord length of the airfoil.
Each simulation computes the pitching moment coefficient using the pitching axis itself as the reference point. That is, In, the first simulation the pitching moment is computed about $0.25c$ axis, and in the second simulation the pitching moment coefficient is calculated about $0.4c$, etc.
My questions are:
- Is it OK to compare all three moment coefficient together given that the reference points are different?
- Do I have to change the reference point to $0.25c$ for the two last results? if so, how can I achieve that without restarting the simulations and specifying the $0.25c$ as reference point?
Your help is greatly appreciated.