I am a CFD consultant and I have a customer who studies birds flights. For one of the 3D model we have (a very specific and unusual flight configuration of the bird), we know where is the center of mass. But we are now looking for a way to determine the torque in the 3 axis generated by this very disymmetric configuration. For this, we first need to determine first where could be located the aerodynamic center - which can't be done analyticaly considering the complexity and the specific wings retractation profile (the cord ratio rule is simply not applicable here)
My approcah is currently to trace one of the torque value for consecutive arbitrary points along the length of the bird and for various angle of attacks. Location of the AC should then coincide with non-changing value point. I would like first to know if this approach makes sense to you? If not, is there a practical way to determine it so I can reproduce the experiment digitally?
Thanks in advance for any support.