minimum surface angle
 

hey, i use mesh motion in cfx. and i wanna have a level to check mesh quality after simulation, as a consequence, i chose minimum surface angle as a level, but i am not sure what degree of this variable is ok for guide vanes?
thank you

It is problem dependent so there is no universal answer. Single phase incompressible flows are tolerant of poor quality meshes, but free surface flows and flows with shock waves require very high quality meshes.

You have to determine what is acceptable in your case by a sensitivity analysis.