The Lorentz Forces computation is enabled only for regions filled with an electrically conducting material. Therefore before computing the Lorentz force check the value of the electrical conductivity (and also of the relative magnetic permeability, although its value in melts is usually unity) of the materials.

The linear equations system will be solved for the vector sum of the vector potentials with shifted phases. Therefore the equations system can be solved quickly without any iterative procedure. The only exception is the temperature dependent electric conductivity of the melt which makes a coupling between the fluid dynamics and vector potential solutions necessary.

Take care about the numerical resolution of the skin layer if you are working with especially high frequency or high electric conductivities or magnetic permeabilities. Refine the numerical mesh at the boundary between electric conductors and isolators/vacuum if required. The unstructured mesh should be refined because only unstructured mesh is used for calculation of the alternating and traveling electromagnetic fields.

Specify your inductors with shifted phase currents using the

**TMF**option of the direct heat in the**Heaters**dialog.Specify the phase shift and electric current for each inductor/heater.

Don't forget to enter a positive frequency. The frequency must be the same for all inductors in this model.

Now you are ready to compute the Lorentz forces:

Select the region(s) in the furnace where the Lorentz force should be computed.

Check the

**Lorentz Forces**box in the**Physical Phenomena**dialog and confirm with**Apply**button.Change the actual variable in the main

*CrysMAS*window to**(r,z)-Lorentz forces**and start computation by selecting**Computation**>**Start Computation**or by clicking on .