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The *EM keyword cards provide input for a new electromagnetism module for solving 3D eddy-current, inductive heating or resistive heating problems, coupled with mechanical and thermal solvers. Typical applications include magnetic metal forming and welding. A boundary element method in the air is coupled to finite elements in the conductor in order to avoid meshing the air. For Eddy current related applications, you can follow this series of tutorial videos :

This example shows the basic keywords mandatory in order to turn on the EM solver and set up a Eddy current problem. The current flows through the rod and an induced magnetic field is generated. The mesh has been set up based on the skin depth value to ensure enough refinement to capture the current diffusion though the thickness.  …more

This LS-DYNA simulation shows a simple Electromagnetic forming example using the EM solver. A R,L,C circuit is defined in the coil which produces induced currents in the workpiece. This in turn generates Lorentz forces which cause the plate to move. Local heating is also produced and handled by the thermal solver.  …more

This LS-DYNA simulation shows a simple Tube expansion example using the EM solver. A current is imposed in the coil which produces induced currents in the workpiece. This in turn generates Lorentz forces which cause the tube to expand. This problem is of medium size so running with 4 or more CPUs is recommended.  …more

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.  …more

This LS-DYNA simulation shows a simple resistive heating problem. The EM resistive heating solver considers the rise time of the current to be slow or non existent (DC current). As such, no inductive and diffusive effects appear which allows the solver to remove the BEM system. The EM solve is consequently very fast and a very high EM timestep can be used.  …more

A railgun consists of two parallel metal rails connected to an electric power supply. The projectile completes the circuit. The current flowing through the rails and projectile generates a magnetic field which in turn generates a Lorentz force propelling the projectile out of the barrel at a very high speed.  …more

The R9 version introduced many new advanced capabilities to the axisymmetric solver. For example, it is now possible to simulate pancake or helicoid type of coils by connecting the different turns using EM_CIRCUIT_CONNECT therefore expanding the range of applicable EM forming or bending problems that can be solved using the axisymmetric solver.  …more

The TEAM 28 problem introduces an axisymmetric electrodynamic levitation device which consists of a conducting plate over two stranded coils. The aim is to determine the dynamic characteristics of the levitating plate (after some damped oscillations, the plate attains a stationary levitation height). A coupled solution of the electromagnetic and the mechanical problem is necessary.  …more

The EM solver is capable of mimicking the complex electrochemistry happening in the layers of lithium ion batteries via the introduction of a 'distributed Randles circuit' model in order to simulate the current flows and local heating. The current example features a simple discharge of a solid battery.  …more

Resistance Spot Welding (RSW) is an important welding process for thin sheet metals with many applications, in particular in the automotive industry. In this method, the contacting metal surfaces are joined by the heat obtained by Joule heating of an electrical current flowing through resistances.  …more

The current example of battery simulation features the fall of a sphere on a 10 cells battery provoking an internal short circuit. The layers of each cell are composed by tshell elements.  …more

The current example features the fall of a cylinder on the tabs of a solid battery provoking an external short circuit. The battery discharges itself in the cylinder. The layers of each cell are composed by tshell elements.  …more