A few preconditioners are available for the finite element method (FEM).
Note: For advanced users only - it is recommended to use the default settings.
On the Solve/Run tab, in the
Solution Settings group, click the Solver Settings icon. On the Solver Settings dialog, click the
Advanced tab.
Figure 1. The Solver Settings dialog (Advanced
tab).
Multilevel ILU/diagonal decomposition (512)
Preconditioner for a hybrid FEM/MoM solution that uses a multilevel sparse incomplete
LU-decomposition with threshold and controlled fill-in. Note, not available for
parallel.
Preconditioner for a hybrid FEM/MLFMM solution that uses a multilevel sparse LU decomposition
of the combined and partitioned, FEM/MLFMM system. This is the default for a FEM/MLFMM solution.
When using the
parallel Solver, the factorisation type, which
slightly impacts runtime and memory, can be specified.
Multilevel LU/diagonal decomposition (2050)
Preconditioner for a hybrid FEM/MoM solution that uses a multilevel sparse LU decomposition of
the partitioned system. This is the default for a FEM/MoM solution.
When using the
parallel Solver, the factorisation type, which
slightly impacts runtime and memory, can be specified.
Note: The number in brackets corresponds to the value of the I3 field at the CG card
in the .pre file.
Solver Settings icon. On the Solver Settings dialog, click the
Advanced tab.