[Noa_sisi]

Hi everyone.
I am trying to make a model of bee flight in COMSOL. As far as i am concerned i must do this by using two physics. first is the MULTIBODY DYNAMICS to create a hinge joint so that i can simulate the wing rotation around the bee body. second is a fsi physics to simulate the effect of wing rotation on the air around the bee.
while preparing the geometry, in the finalization part when i check 'create assembly' and click build all, then the fsi physics does not identify the solid fluid interaction boundaries. when i check the 'create a union' and click buil all, this time the hinge part does not work and returns an error:
failed to make variable Jacobian.
I will be so happy if one could tell me what to do with the anomly.