I have done the analysis for  "two stage Savonius rotor with straight 2 blades" with different overlap ratios ranging from 0.1 to 0.3.

for the overlap ratio of 0.15, the net moment I got in Z-direction is 0.0621, similarly I am getting the moment in X, and Y directions also.

Along X-direction---- ( -0.02088) why negative here?

 In Y-direction (0.03456).

There is no much decrease in the moment value in other directions compared to Z-direction. Why?

Why I am getting those moments in other directions while rotor is rotating using Z-axis.

Could any body please explain the reason?

Below I am attaching the file

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