Computing the Surface and Volume Force Density

How does Ansys Maxwell compute the surface and volume force density?

The way that Ansys Maxwell computes the surface and volume force density is described in Maxwell Help > Maxwell Coupling > Maxwell Harmonic Force Coupling > Force Density Calculation. You can find documentation here.

Fx,Fy, Fz are the force at the indicated direction (x, y , z).
Mag Force = sqrt ( Fx^2 + Fy^2 + Fz^2 )

In cylindrical coordinate systems, the force needs to be calculated using the Fields Calculator. In this case, the direction is specified in Vector / Scal? / Scalar X.

In cylindrical coordinate systems, the equivalence is:

X -> Radial
Y-> Phi
Z -> Z

The Mag Force is calculated using the equation described above, but it is based in the cylindrical coordinate systems.