*GEOMETRIC CONSTRAINT
Keyword type: step
With *GEOMETRIC CONSTRAINT one can define geometric constraints in a feasible direction step. It can only
be used for design variables of type COORDINATE.
Right now, the following geometric constraint types are allowed:
- FIXSHRINKAGE: the structure is not allowed to shrink for the given node
set:
- FIXGROWTH: the structure is not allowed to grow for the given node set.
- MAXMEMBERSIZE: the minimum distance between each node of a given set
and the nodes of an opposite node set is not allowed to exceed a given
size in the user's units.
- MINMEMBERSIZE: the minimum distance between each node of a given set
and the nodes of an opposite node set is not allowed to fall below a given
size in the user's units.
There are now parameters on this keyword.
First line:
Second line:
- the type of the geometric constraint
- a node set
- an opposite node set (only for type MAXMEMBERSIZE and MINMEMBERSIZE)
- an absolute value (only for type MAXMEMBERSIZE and MINMEMBERSIZE)
Repeat this line if needed.
Example:
*FEASIBLE DIRECTION
*GEOMETRIC CONSTRAINT
MAXMEMBERSIZE,N1,N2,.1
specifies that the distance between each node of set N1 and the nodes in set
N2 should not exceed .1 in the user's units.
Example files: .