TIMP, ELEM, CHGBND, IMPLEVEL
Improves the quality of tetrahedral elements that are
not associated with a volume.
ELEMIdentifies the tetrahedral elements to be improved.
Valid values are ALL and P. If ELEM =
ALL (default), improve all selected tetrahedral elements. If ELEM = P, graphical picking is enabled and all remaining
command fields are ignored (valid only in the GUI).
CHGBNDSpecifies whether to allow boundary modification.
Boundary modification includes such things as changes in the connectivity
of the element faces on the boundary and the addition of boundary
nodes. (Also see the Notes section below for important usage information
for CHGBND.)
0 | — | Do not allow boundary modification. |
1 | — | Allow boundary modification (default). |
IMPLEVELIdentifies the level of improvement to be performed on the elements. (Improvement occurs primarily through the use of face swapping and node smoothing techniques.)
0 | — | Perform the least amount of swapping/smoothing. |
1 | — | Perform an intermediate amount of swapping/smoothing. |
2 | — | Perform the greatest amount of swapping/smoothing. |
3 | — | Perform the greatest amount of swapping/smoothing, plus additional improvement techniques (default). |
The TIMP command enables you to improve a given tetrahedral mesh by reducing the number of poorly-shaped tetrahedral elements (in particular, the number of sliver tetrahedral elements)--as well as the overall number of elements--in the mesh. It also improves the overall quality of the mesh.
TIMP is particularly useful for an imported tetrahedral mesh for which no geometry information is attached.
Regardless of the value of the CHGBND argument, boundary mid-nodes can be moved.
When loads or constraints have been placed on boundary nodes or mid-nodes, and boundary mid-nodes are later moved, ANSYS issues a warning message to let you know that it will not update the loads or constraints.
No boundary modification is performed if shell or beam elements
are present in the mesh, even when CHGBND = 1.