Parameter rotationAxis defines the axis in Cartesian coordinates (directional vector of the axis).

Parameter rotationCentre is any point from the axis. So, the axis is defined by its directional vector and one of its points. cyclicAMI boundary condition is the same for all quantities (scalars, vectors, tensors):

p, U, k, omega, epsilon, T:

boundaryField
{
rotor_periodic_1
{
type cyclicAMI;
}
}