Step 1: Mesh

1.   Read in the mesh file sector.msh.

File $\rightarrow$ Read $\rightarrow$ Mesh...

2.   Change the periodic type of periodic-a to rotational.

Boundary Conditions periodic-a Edit...

(a)   Select Rotational in the Periodic Type list.

(b)   Click OK to close the Periodic dialog box.

3.   In a similar manner, change the periodic type of periodic-b to rotational.