Definition of 'azimuthal', 'axial' and 'radial', as used in details of subdividing.
A 3-dimensional cylinder can be subdivided by the program in two directions:
(a) along the direction of the axis of the cylinder, referred to as axially, and
(b) in the angular direction around the axis, referred to as azimuthally.
Cones can also be subdivided in these two directions.
A flat disc can be subdivided in two directions:
(a) in the direction away from the centre of the disc, referred to as radially, and
(b) in the angular direction around the centre, referred to as azimuthally.
In the cylindrical (also called cylindrical polar) coordinate system (r,z,phi) that applies to a system which has the z axis as an axis of rotational symmetry, the angle phi is the azimuthal angle. A plane at right angles to the axis is sometimes called an equatorial plane, and then phi is described as the equatorial angle.
See section 2.3 of the User`s Guide for descriptions of the coordinate systems used for 2- and 3-dimensional systems of electrodes.