The unstructured mesh methods described above have been also applied in problems with a complicated boundary shape.
In [7] the equations were supplemented by
additional equations for variables p and v; this system
is known as Compressional Reduced MHD.
[7, 8].
The equations were solved on the computational mesh
shown, at a low resolution of 800 mesh points for clarity, in
Fig.9(a). The contours of the equilibrium magnetic
flux 
are shown in Fig.9(b).
In [8] the equations were solved in three dimensions, in the CRMHD approximation, where the third dimension was discretized by finite differences. The grid in the x,y plane was independent of the third coordinate. The x,y grid was similar to that of Fig.9(a).
Finally the finite element discretization described here is being combined with an existing 3D MHD code to give a highly flexible and powerful method for solving 3D nonlinear MHD problems in complex geometry [9]. Again the x,y grid is independent of the third coordinate, which is discretized using Fourier series.