Thin Film Flow (Cut Line)

Hi-

I have a thin film flow approximating a lubrication bearing. I want to create a 2D plot of pressure on axis and angle on the other. I am aware of how to use cut line 2D on a 2D surface to make a 1D line graph but I am not sure how to parametrize a line around the center of the cylinder.

Any help would be greatly appreciated!

Thanks!

RR