About Cluster Groups

Elements can be clustered to have equal pseudo densities in certain areas during the optimization (CHECK_TYPE = CLUSTER_GROUPS).

Define a cluster group as follows:

DVCON_TOPO
  ID_NAME = DVCON_CLUSTER
  EL_GROUP = CLUSTER_1 
  EL_GROUP = CLUSTER_2 
  EL_GROUP = CLUSTER_3 
  EL_GROUP = CLUSTER_4 
  ......
  ......
  EL_GROUP = CLUSTER_143 
  EL_GROUP = CLUSTER_144 
  CHECK_TYPE = CLUSTER
END_

Note: Elements within one refered element group will have the same values for pseudo densities. But two different element groups will have different values for pseudo densities.

Reference theDVCON_TOPO ID name in the OPTIMIZE command in order to activate this restriction:

OPTIMIZE
  ID_NAME = ...
  .......
  DVCON = DVCON_CLUSTER
  .......
END_

To give an example the following model is considered:

Model Displacements Stresses






To obtain an extrudable profile as the optimization result cluster groups are utilized:

Mesh Clustering groups




The corresponding optimized structures are shown in the following figures:

Optimization without clustering Optimization with clustering groups