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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>DV_SIZING</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3"><table class = "DocHeaderIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
    <span class = "shortdesc">Definition of the design elements for sizing optimization.</span>

  </p>
<p>This page discusses: </p><ul><li><a href = "#tso-r-cmd-dvSizing__tso-r-cmd-dvSizing-rmk" id = "toc_rg" title = "">Remarks</a></li><li><a href = "#tso-r-cmd-dvSizing__tso-r-cmd-dvSizing-expl" id = "toc_rg" title = "">Examples</a></li></ul>
</p></td></tr></table></td><td class = "DocHeader2"><table class = "DocTopicsSeeAlso" id = "table13"><tr><td class = "TopicsTitle">See Also</td></tr></table><table class = "DocTopicsInOtherGuides" id = "table14"><tr><td height = "8px"/></tr><tr><td class = "TopicsTitleNormal">In Other Guides</td></tr><tr><td><a title = "For each optimization problem, the design variables represent the values to be changed during the optimization." href = "../TsoUserMap/tso-t-usr-sizing-desVar.htm#tso-t-usr-sizing-desVar">Defining Design Variables (DV_SIZING)</a></td></tr></table></td></tr></table>

  

  
  <div class = "body refbody">
   <table class = "table" id = "tso-r-cmd-dvSizing__aa1869768"><caption/><colgroup><col/><col/><col/></colgroup><tbody class = "tbody">
       <tr class = "row">
        <td class = "entry">
          <p><span class = "ph uicontrol">ID_NAME</span></p>
        </td>
        <td class = "entry">
          <p>= <code class = "ph codeph">&lt;id_name_of_dv_sizing&gt;</code></p>
        </td>
        <td class = "entry">
          <p>Name of the <code class = "ph codeph">DV_SIZING</code> definition.</p>
        </td>
       </tr>
       <tr class = "row">
        <td class = "entry">
          <p><span class = "ph uicontrol">EL_GROUP</span></p>
        </td>
        <td class = "entry">
          <p>= <code class = "ph codeph">&lt;name_of_element_group&gt;</code></p>
        </td>
        <td class = "entry">
          <p>Name of the element group.</p>
        </td>
       </tr>
       <tr class = "row">
        <td class = "entry">
          <p><span class = "ph uicontrol">INITIAL_DV_FIELD</span></p>
        </td>
        <td class = "entry">
          <p>= <code class = "ph codeph">&lt;name_of_file&gt;</code></p>
        </td>
        <td class = "entry">
          <p>Name of the file with the initial thicknesses distribution field to be used for the optimization.</p>
        </td>
       </tr>
      </tbody></table>
   <div class = "section" id = "tso-r-cmd-dvSizing__tso-r-cmd-dvSizing-rmk"><h2 class = "title sectiontitle">Remarks</h2>
    
    <ol class = "ol">
      <li class = "li">All elements in the element group might be modified during optimization.
      </li>
      <li class = "li">Only certain types of elements (for more information see
       <a class = "xref" href = "../TsoUserMap/tso-m-usr-solver-sb.htm#tso-m-usr-solver-sb" title = "This chapter describes the formats and functionalities of the different solvers supported by SIMULIA Tosca Structure. The topological and physical properties of the analysis model (finite element input file) are required for the optimization of an FE model. Normally, not all information contained in the analysis model is necessary for an optimization. The optimization module returns the modified model data to the FE solver. The node coordinates are changed during shape and bead optimization. New materials and element properties are generated during topology optimization and the assignments of the elements to the material definitions and material properties are changed. Therefore, there are very few restrictions to the FE modeling (finite element input file).">Solver Specific Features</a>)
       are permitted to be optimization elements.
       <span class = "ph">Tosca Structure.sizing</span>
       supports only single layered shells. All elements not permitted are removed
       from the group.
      </li>
      <li class = "li">The <code class = "ph codeph">INITIAL_DV_FIELD</code> option is available only for sensitivity-based
          optimization. </li>
      <li class = "li">The file applied at
       <code class = "ph codeph">INITIAL_DV_FIELD</code> that contains the initial
       thicknesses distribution field must be located in the start directory of the
       optimization job.
        The format of the
       file must be ONF (Optimization Neutral File). The initial thicknesses
       distribution field is extracted from the data block 740 with the title
       <span class = "ph">ELEMENT_THICKNESS</span>.
      </li>
      <li class = "li">When using a thicknesses distribution of a previous optimization
       run for the new optimization, it is recommended that you rename the file
       SIZING_XXX.onf (for example, to
       <code class = "ph codeph">INITIAL_MAT.onf</code>). Otherwise name conflicts with the
        running optimization (with newly generated thicknesses distribution files
        SIZING_XXX.onf) might lead to confusion in the post-processing.
      </li>
      <li class = "li"><code class = "ph codeph">INITIAL_DV_FIELD</code> for sizing optimization means an
       initial thicknesses distribution.
      </li>
    </ol>
   </div>


   <div class = "section" id = "tso-r-cmd-dvSizing__tso-r-cmd-dvSizing-expl"><p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title sectiontitle">Examples</h2>
    
    <pre class = "codeblock">
<code class = "ph codeph">DV_SIZING
  ID_NAME  = dv_sizing_name
  EL_GROUP = design_elem_grp
END_
</code></pre>
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