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This LS-DYNA simulation shows a simple inductive heating problem. 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. At that point, the matrices are recomputed and the whole procedure is repeated. If the conductor do not move and have a constant conductivity, then the EM macro timestep can be as long as the run. An optional 'switch.k' file can be included which turn the EM solver on and off based on a specific node temperature.