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*EM
*EM_2D_AXI
*EM_2DAXI
Purpose: Sets up the electromagnetism solver as 2D axisymmetric instead of 3D, on a given
part, in order to save computational time as well as memory.
The electromagnetism is solved in 2D on a given cross section of the part (defined by a segment
set), with a symmetry axis defined by its direction (at this time, it can be the x,y or z axis). The
EM forces and Joule heating are then computed over the full 3D part by rotations. The part needs
to be compatible with the symmetry, i.e each node in the part needs to be the child of a parent
node on the segment set, by a rotation around the axis. Only the conductor parts (with a
*EM_MAT of type 2 or 4) should be defined as 2D axisymmetric.
Card 1
Variable
Type
Default
VARIABLE
1
2
3
4
PID
SSID
DIR
2DOPT
I
I
I
I
none
none
none
none
5
6
7
8
DESCRIPTION
PID
Part ID of the part to be solved using 2D axisymmetry
SSID
Segment Set ID : Segment that will define the 2D cross section of the
part where the EM field is solved
DIR
Defines the symmetry axis. At this time, only the x,y or z axis can be
used ::
EQ.1: X axis
EQ.2: Y axis
EQ.3: Z axis
Remarks:
At this time, either all or none of the conductor parts should be 2D axisymmetric. In the future, a
mix between 2D axisymmetric and 3D parts will be allowed.
LS-DYNA R7.0
4-3 (EM)