A few preconditioners are available for the finite element method (FEM).
Note:
It is recommended to use the default settings. Changing the preconditioner is
recommended only for advanced users.
The number in brackets corresponds to the value of the I3 field at the CG
card in the model .pre file.
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.
Solver Settings icon. On the Solver Settings dialog, click the
Advanced tab.