An O-Grid example in blockMesh
BlockMesh is a built in mesher in OpenFOAM. It has capabilities for creating simple block structured meshes, not meshes for complex geometries. The usage of blockMesh is described here.
The mesh has one layer thickness in z direction, the current diameter is ~21 mm, the side of surrounding box is 50 mm.
The numbering of vertices (white numbers) and blocks (black numbers) is the following:
Download blockMeshDict file:
The file should be placed here: <case>/constant/polyMesh/blockMeshDict