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      <title>ACMODL</title>
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      <div class="title_refTopic" id="xps10_pagetitle">ACMODL </div>
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      <h4 class="refClassification">Fluid-Structure Interface Modeling Parameters </h4>
      <p class="para_refTopic">Defines modeling parameters for the interface between the fluid and the structure. </p>
      <div class="title_refCategory">Format: </div>
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                     <p class="para_td">1 </p>
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                     <p class="para_td">2 </p>
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                     <p class="para_td">ACMODL </p>
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                     <p class="para_td">INTER </p>
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                     <p class="para_td">INFOR </p>
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                     <p class="para_td">FSET </p>
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                     <p class="para_td">SSET </p>
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                     <p class="para_td">FSTOL </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Example: </div>
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                     <p class="para_td">ACMODL </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">0.002 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Fields:</div>
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                     <p class="para_th"><b class="uiTerm">Field </b></p>
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                     <p class="para_th"><b class="uiTerm">Contents </b></p>
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                     <p class="para_td">INTER </p>
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                     <p class="para_td">Type of interface between the fluid and the structure.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/12topic_2.html#ref61432');return(false);">1-1</a> (Character=&ldquo;IDENT&rdquo; or &ldquo;DIFF&rdquo;; Default=&ldquo;DIFF&rdquo;). 
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                     <p class="para_td">INFOR </p>
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                     <p class="para_td">Indicates whether FSET and SSET are to be used to define the fluid-structure interface.  (Character=&ldquo;ALL&rdquo; or &ldquo;NONE&rdquo;, Default=&ldquo;NONE&rdquo;) </p>
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                     <p class="para_td">FSET </p>
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                     <p class="para_td">Identification number of a SET1 entry that contains a list of fluid grid points on the interface.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/12topic_2.html#ref39943');return(false);">1-2</a> (Integer &gt; 0 or blank). 
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                     <p class="para_td">SSET </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of a SET1 entry that contains a list of structural grid points on the interface.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/12topic_2.html#ref39943');return(false);">1-2</a> (Integer &gt; 0 or blank). 
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                     <p class="para_td">FSTOL </p>
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                     <p class="para_td">Tolerance, in units of length, used in determining the fluid-structure interface.  (Real &gt; 0.0;  Default=0.001) </p>
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      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li><a name="ref61432"></a><p class="para_item">Only one ACMODL entry is allowed.  If this entry is not present, then the program will assume INTER=&ldquo;DIFF&rdquo; and FSTOL=0.001. </p>
            </li>
            <li><a name="ref39943"></a><p class="para_item">If INFOR=&ldquo;ALL&rdquo;, then both FSET and SSET must be specified and matching is checked at only those grid points referenced by FSET and SSET. </p>
            </li>
            <li>
               <p class="para_item">See <a class="links" href="javascript:void(0)" onclick="top.popUpPage('User/index.html?goto=User/24ref23140b_13.html&vars=-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Fluid-Structure Interface&rdquo; </a>of the <em>NX Nastran User&rsquo;s Guide</em> for a description of the methods used in determining the fluid-structure interface. 
               </p>
            </li>
            <li>
               <p class="para_item">The points referenced by FSET and SSET must lie exactly on the fluid-structure interface.  A fatal message is issued if: (a) INTER=&ldquo;IDENT&rdquo; and a point in SSET or FSET does not have a corresponding and coincident point in FSET or SSET, respectively, or (b) INTER=&ldquo;DIFF&rdquo; and any point in SSET or FSET does not lie on the interface. </p>
            </li>
            <li>
               <p class="para_item">If fluid-element faces are defined on both sides of a structural surface, then INTER=&ldquo;IDENT&rdquo; must be specified. </p>
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