DV_TOPO

Definition of the design elements for topology optimization.

This page discusses:

See Also
In Other Guides
Defining the Design Area 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 might be modified during optimization.
  2. Only certain types of elements (for more information, see Tosca Structure User Guide) are permitted to be optimization elements. All elements not permitted are removed from the group.
  3. The INITIAL_DV_FIELD option is available only for sensitivity-based optimization.
  4. The file applied at INITIAL_DV_FIELD containing the initial material distribution must be located in the start directory of the optimization job. The format of the file must be ONF (Optimization Neutral File). The initial material distribution is extracted from the data block 740 with the title MAT_PROP_NORMALIZED.
  5. When using a material distribution of a previous optimization run for the new optimization, rename the file TP_XXX.onf (for example, to INITIAL_MAT.onf). Otherwise, name conflicts with the running optimization (with newly generated material distribution files TP_YYY.onf) might lead to confusion in the post processing: the start file TP_XXX.onf might be considered and shown as the last iteration (if XXX is larger as the last iteration in the actual optimization). (For more information, see 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 and Resume 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
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