Simulation:
Solver
Start SimulationSpecials
Solver type
Here the solver type is specified that is used in combination with tetrahedral meshing to solve the linear system of equations.
Auto: The solver type is automatically set depending on the problem size (recommended).
Iterative: An iterative solver is used.
Direct: A direct solver is used.
Note: In combination with hexahedral meshing an iterative solver is always used and it is not possible or necessary to change this.
Solver order
This option allows to specify whether the magnetostatic solver with tetrahedral mesh uses first-, second- or third-order accuracy. Second-order is the default due to its good compromise between accuracy and memory efficiency. However, if the structure is geometrically complex and therefore comes along with huge memory requirements, first-order is an alternative. On the other hand, third-order delivers a better solution for coarsely discretized problems.
Curvature...
This button opens the Special Mesh Properties dialog, where the curved element order can be specified.
Maximum iterations
The number of iterations performed by the linear solver is automatically limited by a number depending on the desired solver accuracy. If you would like to prescribe a fixed upper limit for number of linear iterations, deactivate the "Automatic" checkbox and enter a positive number in the edit field.
Relax divergence check
If current sources are defined, the magnetostatic solver requires them to form closed current loops or that they end at perfect electric conductors (PEC) or electric boundary conditions. The same condition has to be fulfilled if conductive domains are defined and a stationary current field is used as source for the magnetostatic solver. (This can be enabled in the Magnetostatic Solver Dialog.)
Otherwise the problem is not solvable by the magnetostatic solver, since Ampere's Law is violated. If such a situation is detected by the solver, an error will be printed saying that the model is not divergence-free or that currents are appearing or disappearing within the calculation domain. The solver will abort in this case.
This detection method is called divergence check. A divergence check might fail even for valid model setups, if the source field could not be computed with sufficient accuracy. Typical reasons are low mesh quality, high ratios (jumps) in material coefficients or insufficient accuracy settings. In particular, when a stationary current field is used as source for the magnetostatic solver, it is recommended to use a high accuracy for the linear solver. Furthermore, you can consider to refine the mesh or to relax high ratios of the material coefficients by replacing materials with very high electric conductivities by PEC material or materials with very low conductivities by normal material.
If you do not want the solver to abort in case of a detected divergence error, you should activate this checkbox. Mind that this might lead to convergence problems or inaccurate results. Please check your results carefully in this case.
Remark: The divergence check will be performed anyway. But if this checkbox is activated, only a warning will be printed informing you about potential problems.
Consider PEC as Normal
If this checkbox
is enabled, PEC material is considered like normal material with a permeability
ยต which can be defined in the material properties of the PEC material.
This option is default only when a Particle Tracking or PIC template is
used; otherwise this checkbox is disabled by default.
OK
Accepts the changes and closes the dialog.
Cancel
Closes this dialog box without performing any further action.
Help
Shows this help text.
See also