From FreeCAD Documentation
- After adding an Elmer solver as described here, select it in the tree view.
- Now either use the toolbar button or the menu Solve → Electromagnetic Equations → Magnetodynamic equation.
- Change the equation's solver settings or the general solver settings if necessary.
- It is recommend to set in the Linear System solver settings the DataLinear Iterative Method to BiCGStabl , the DataBiCGstabl Degree to 4 and DataLinear Preconditioning to None. This assures the equation can be solved in most cases. If so, these parameters can be changed if necessary.