UPCOORD, FACTOR, Key
Modifies the coordinates of the active set of nodes, based
on the current displacements.
FACTORScale factor for displacements being added to nodal
coordinates. If FACTOR = 1.0, the full
displacement value will be added to each node, 0.5, half the displacement
value will be added, etc. If FACTOR =
-1, the full displacement value will be subtracted from each node,
etc.
KeyKey for zeroing displacements in the database:
OFF | — | Do not zero the displacements (default). |
ON | — | Zero the displacements. |
The UPCOORD command uses displacements stored
in the ANSYS database, and not those contained within the results
file, Jobname.RST. Nodal coordinates are updated
each time the command is issued. After updating, both the nodal displacements
and rotations are set to zero if Key =
ON.
For structural solutions with an updated mesh, unless the coefficient matrix is otherwise reformed (e.g., a new analysis or NLGEOM,ON) it should first be reformed by issuing a KUSE,-1 command.
UPCOORD should not be issued between load steps in structural analysis.
For a multiphysics simulation where a CFD or electromagnetic
field is being coupled to a structure undergoing large displacements,
all (or a portion) of the surrounding field mesh may take part in
the structural solution to "move" with the displacing structure.
You can use the UPCOORD command with a suitable FACTOR to update the coordinates of the nodes using
the newly computed displacements. The mesh will now conform with
the displaced structure for subsequent field solutions. However,
the mesh should always be restored to its original location by using
an UPCOORD,FACTOR command
before performing any subsequent structural solutions. This is true
for both repeated linear solutions, and for nonlinear restarts. (All
saved displacements are relative to the original mesh location.)
This command is not intended to replace either the large displacement or birth and death logic.
This command is also valid in PREP7.