A curvilinear grid around a cylinder has the following properties:
- The grid has $n_\varphi =20$ grid points in angular direction (along a circle in the xy-plane).
- The grid has $n_r =5$ grid points in radial direction (from the cylinder outwards)
- The grid has $n_z =8$ grid points in z-direction.
- The grid has a thickness of $b =5$ around the cylinder