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This LS-DYNA simulation shows a simple pancake coil + flux concentrator inductive heating problem. The Monolithic solver must be turned on in order to handle the zero conductivity/high permeability properties of the flux concentrator. Its presence allows a stronger concentration of the magnetic field close to the coil and therefore will generate more heat in the workpiece.

During the initial EM solve, a micro EM timestep is calculated using the circuit's current period divided by a factor NUMLS. Over a whole period, the full Eddy current problem is solved. An average Joule heating is calculated which is then given to the thermal solver over all the subsequent periods  until reaching a time defined by a EM macro timestep. In this problem, the coil and the thermal material properties are considered constant so the EM macro timestep can be defined as the termination time. In cases involving moving coils or varying material properties, it is important to periodically update the average joule heating by defining this EM macro timestep.

Courtesy of : Dr. Miro Duhovic, Institut fur Verbundwerkstoffe(IVW) $GmbH, Kaiserslautern