1≤r≤3
0.001 ≤ r ≤ 3
0.6 ≤ r ≤ 3
Cp is the highest at (r,θ) = (R,0) and (R,π).
This implies that they are stagnation points.
This is the area of greatest pressure.
Cp is the lowest at (r,θ) = (R,π/2) and
(R,3π/2). This implies that the velocity is
the highest at these points, and thus they are
the areas of lowest pressure.