Checkerboard structures cannot be manufactured in practice. The user
also wants to obtain a mesh-independent result from the optimization.
Due to these demands, SIMULIA Tosca Structure
has a filter technique implemented to avoid mesh dependence. A specification
of a filter radius (FILTER_RADIUS parameter) is necessary
for applying the filter. If the radius of the filter is not specified,
the optimization is performed without using a filter.
If the given radius is too large, the optimization result will not show a detailed structure. A
small value of the radius leads to a finer structure.
Note:
It is recommended to choose the filter radius equal to twice the mean
element edge length.
The filter radius is defined in OPT_PARAM command as follows:
OPT_PARAM
ID_NAME = optimization_control
OPTIMIZE = id_of_optimize
...
FILTER_RADIUS = 5.
END_