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.
EM current density fringes and cut plane showing the magnetic field fringes and vectors
*CONTROL_TERMINATION *CONTROL_TIMESTEP *DATABASE_BINARY_D3PLOT *DEFINE_CURVE_TITLE *EM_CIRCUIT *EM_CONTROL *EM_CONTROL_TIMESTEP *EM_MAT_001 *END *KEYWORD *MAT_RIGID *PARAMETER *PART *SECTION_SOLID *TITLE
$-----------------------------------------------------------------------------
$
$ Example provided by Iñaki (LSTC)
$
$ E-Mail: info@dynamore.de
$ Web: http://www.dynamore.de
$
$ Copyright, 2015 DYNAmore GmbH
$ Copying for non-commercial usage allowed if
$ copy bears this notice completely.
$
$X------------------------------------------------------------------------------
$X
$X 1. Run file as is.
$X Requires LS-DYNA MPP R8.0.0 (or higher) with double precision
$X
$X------------------------------------------------------------------------------
$# UNITS: (Dimensionless)
$X------------------------------------------------------------------------------
$X
*KEYWORD
*TITLE
EM Basic Eddy current problem set up
*PARAMETER
R T_end 5e-4
R dt_plot 5e-6
$
$--- em
R em_cond 1.e4
R em_dt 1.e-5
$
$
$--- struc
$
R dt_struc 5.e-6
Rrho_struc 7000.
R E_struc 2.e11
R nu_struc 0.3
*INCLUDE
struc.k
*INCLUDE
mesh.k
*INCLUDE
voltage.k
*DATABASE_BINARY_D3PLOT
&dt_plot
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
$ $
$ EM CONTROL $
$ $
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*EM_CONTROL
$ emsol
1
*EM_CONTROL_TIMESTEP
$# tstype dtcons lcid
1 &em_dt
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
$ $
$ EM CIRCUIT $
$ $
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*EM_CIRCUIT
$ circid circtype lcid R L C V0
1 2 10
$ ssidCurr ssidVltin ssidVltOt partID
2 1 2
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
$ $
$ EM MAT and EOS $
$ $
$---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
*EM_MAT_001
$ em_mid mtype sigma eos
1 2 &em_cond
*END
