<!DOCTYPE html
  PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<!--
Copyright (c) 2006 UGS Corp.

All Rights Reserved.

This software and related documentation are proprietary to UGS Corp.
-->
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>GRID</title>
      <script language="javaScript">
        abridged="false";
        displayConditions=new Array();
      </script>
      <link type="text/css" href="../css/main_styles.css" rel="stylesheet">
   </head>
   <body class="bodydocs" onload="top.pageLoader()" bgcolor="#FFFFFF">
      <hr noshade="true">
      <div class="title_refTopic" id="xps10_pagetitle">GRID </div>
      <hr noshade="true">
      <h4 class="refClassification">Grid Point </h4>
      <p class="para_refTopic">Defines the location of a geometric grid point, the directions of its displacement, and its permanent single-point constraints. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <thead>
               <tr>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">1 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">2 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">3 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">4 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">5 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">6 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">7 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">8 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">9 </p>
                  </th>
                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">10 </p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr valign="middle">
                  <td align="left" colspan="1" rowspan="1">
                     <p class="para_td">GRID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">ID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">CP </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">CD </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PS </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">SEID </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <tbody valign="middle">
               <tr>
                  <td align="left" colspan="1" rowspan="1">
                     <p class="para_td">GRID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">1.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">-2.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">3.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">316 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
         <table cellpadding="9" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="16*">
               <col span="1" width="84*">
            </colgroup>
            <thead>
               <tr>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Field </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Contents </b></p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">lD </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point identification number.  (0 &lt; Integer &lt; 100000000) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CP </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of coordinate system in which the location of the grid point is defined.  (Integer &ge; 0 or blank*) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">X1, X2, X3 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Location of the grid point in coordinate system CP.  (Real; Default = 0.0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CD </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Identification number of coordinate system in which the displacements, degrees-of-freedom, constraints, and solution vectors are defined at the grid point.  (Integer &ge; -1 or blank *) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PS </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Permanent single-point constraints associated with the grid point.  (Any of the Integers 1 through 6 with no embedded blanks, or blank*.) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">SEID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Superelement identification number.  (Integer &ge; 0; Default = 0) </p>
                  </td>
               </tr>
            </tbody>
         </table><br><p class="para_refCategory">* See the GRDSET entry for default options for the CP, CD, PS, and SEID fields. </p>
      </div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">All grid point identification numbers must be unique with respect to all other structural, scalar, and fluid points. </p>
            </li>
            <li>
               <p class="para_item">The meaning of X1, X2, and X3 depends on the type of coordinate system CP as follows (see the CORDij entry descriptions): </p>
               <table border="1" width="100%" align="center">
                  <colgroup span="1">
                     <col span="1" width="32.29*">
                     <col span="1" width="12.03*">
                     <col span="1" width="27.50*">
                     <col span="1" width="28.18*">
                  </colgroup>
                  <thead>
                     <tr>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">Type </b></p>
                        </th>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">X1 </b></p>
                        </th>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">X2 </b></p>
                        </th>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">X3 </b></p>
                        </th>
                     </tr>
                  </thead>
                  <tbody>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Rectangular </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">X </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Y </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Z </p>
                        </td>
                     </tr>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Cylindrical </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">R </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">&theta;(degrees) </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Z </p>
                        </td>
                     </tr>
                     <tr>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Spherical </p>
                        </td>
                        <td align="center" colspan="1" rowspan="1">
                           <p class="para_td">R </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">&theta;(degrees) </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">&phi;(degrees) </p>
                        </td>
                     </tr>
                  </tbody>
               </table><br><p class="para_item">See <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#User:ref17864:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Overview of Coordinate Systems in NX Nastran&rdquo; </a>in the <em>NX Nastran User&rsquo;s Guide</em> for a definition of coordinate system terminology. 
               </p>
            </li>
            <li>
               <p class="para_item">The collection of all CD coordinate systems defined on all GRID entries is called the global coordinate system.  All degrees-of-freedom, constraints, and solution vectors are expressed in the global coordinate system. See the chapter &ldquo;Understanding Coordinate Systems&rdquo; in the <em>NX Nastran User's Guide</em> for more details.
               </p>
            </li>
            <li>
               <p class="para_item">The SEID field can be overridden by use of the SESET entry. </p>
            </li>
            <li>
               <p class="para_item">If CD = -1, then this defines a fluid grid point in coupled fluid-structural analysis (see <a class="links" href="javascript:void(0)" onclick="top.popUpPage('User/index.html?goto=User/24ref23140b_3.html&vars=-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Performing a Coupled Fluid-Structural Analysis&rdquo; </a>in the <em>NX Nastran User&rsquo;s Guide</em>).  This type of point may only connect the CAABSF, CHACBR, CHACAB, CHEXA, CPENTA, and CTETRA elements to define fluid elements. 
               </p>
            </li>
            <li>
               <p class="para_item">A zero (or blank if the GRDSET entry is not specified) in the CP and CD fields refers to the basic coordinate system. </p>
            </li>
            <li>
               <p class="para_item">In p-version analysis, the hierarchy set to resolve the conflicts arising in the global system input data is described under Remark 10 of the GMBC entry description. </p>
            </li>
            <li>
               <p class="para_item">CID can reference GMCORD type coordinate systems only when the GRID is connected to p-version elements<b class="uiTerm">. </b></p>
            </li>
         </ol>
      </div>
      <div class="title_refCategory">Remarks related to SOLs 601 and 701: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">SEID is ignored. </p>
            </li>
            <li>
               <p class="para_item">The use of GRDSET entry for default options for the CP, CD, and PS fields is not supported. </p>
            </li>
         </ol>
      </div>
   </body>
</html>
