DV_TOPO

Definition of the design elements for topology optimization.

ID_NAME

= <id_name_of_dv_topo>

Name of the DV_TOPO definition.

EL_GROUP

= <name_of_element_group>

Name of the element group.

INITIAL_DV_FIELD

= <name_of_file>

Name of the file with the initial material distribution field to be used for the optimization.

Remarks

  1. All elements in the element group may be modified during optimization.
  2. Only certain types of elements (for more information see the User Manual) are permitted to be optimization elements. All elements not permitted are removed from the group.
  3. The INITIAL_DV_FIELD option is only available for sensitivity-based optimization.
  4. The file applied at INITIAL_DV_FIELD which contains the initial material distribution must be located in the start directory of the optimization job. The format of the file has to be ONF (Optmization Neutral File). The initial material distribution is extracted from the datablock 740 with the title MAT_PROP_NORMALIZED.
  5. When using a material distribution of a previous optimization run for the new optimization it is recommended to rename the file TP_XXX.onf (e.g. to INITIAL_MAT.onf). Otherwise name conflicts with the running optimization (with newly generated material distribution files TP_YYY.onf) may lead to confusion in the postprocessing: the start file TP_XXX.onf may be considered and shown as last iteration (if XXX is larger as the last iteration in the actual optimization). (see also Use Results from Previous Runs as Initial Material Distribution).
  6. The former parameter RESTART_FILE was renamed to INITIAL_DV_FIELD to avoid confusion with the restart of unintentionally stopped optimization runs (see Restart Modes).
  7. INITIAL_DV_FIELD for topology optimization means an initial material distribution for design variables.

Examples

DV_TOPO
 ID_NAME = dv_topo_name
 EL_GROUP = design_elem_grp
END_