[radix]

Dear All,

I have been running a case of NASA Rotor 67 on near stall condition. The turbulence model is Spalart Allmaras. Initially, I started off with a sharp edge blade. It gave me a good validated results. Keeping the turbulence model and operating condition similar, I went for the blunt edge blade. The flow physics was similar, however the flow velcity magnitude differs (I am comparing the relative mach number of both edges). The blunt edge seems to be overpredicting the flow velocity inside the bubble (see below).



The images below are the mesh of each blade.



Could anyone help me on this matter? Should I further refine the mesh of the blunt edge blade? If refinement is the option left, how far should I refine the mesh (currently,my y+ is 15-ish).

Thank you. Should any further information required, please let me know.