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      <title>CAERO1</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CAERO1 </div>
      <hr noshade="true">
      <h4 class="refClassification">Aerodynamic Panel Element Connection </h4>
      <p class="para_refTopic">Defines an aerodynamic macro element (panel) in terms of two leading edge locations and side chords.  This is used for the Doublet-Lattice theory for subsonic aerodynamics and the ZONA51 theory for supersonic aerodynamics. </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*">
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               <col span="1" width="10*">
            </colgroup>
            <thead>
               <tr>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">1 </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">4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">8 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">9 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">10 </p>
                  </td>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="center" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CAERO1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PID </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">NSPAN </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">NCHORD </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">LSPAN </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">LCHORD </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">IGID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </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">Y1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">Z1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X12 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">Y4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">Z4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X43 </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>
               <tr>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">CAERO1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">1000 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">1 </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">3 </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>
                  <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">1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.0 </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">0.2 </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">0.0 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.8 </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="10" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="19.62*">
               <col span="1" width="80.38*">
            </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">EID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Element identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Property identification number of a PAERO1 entry; used to specify associated bodies.  Required even if there are no associated bodies.  (Integer &gt; 0) </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">Coordinate system for locating points 1 and 4.  (Integer &ge; 0; Default = 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">NSPAN </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Number of spanwise boxes; if a positive value is given, NSPAN equal divisions are assumed. If zero or blank, a list of division points is given by LSPAN, field 7.  (Integer &ge; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">NCHORD </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Number of chordwise boxes; if a positive value is given NCHORD, equal divisions are assumed; if zero or blank, a list of division points is given at LCHORD, field 8.  (Integer &ge; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">LSPAN </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ID of an AEFACT data entry containing a list of division points for spanwise boxes.  Used only if the NSPAN field 5 is zero or blank.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">LCHORD </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ID of an AEFACT data entry containing a list of division points for chordwise boxes.  Used only if the NCHORD, field 6, is zero or blank.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">IGID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Interference group identification; aerodynamic elements with different IGIDs are uncoupled.  (Integer &gt; 0) See remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_3.html#igid_restriction1');return(false);">2-8</a> for restriction.
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">X1, Y1, Z1 </p>
                     <p class="para_td">X4, Y4, Z4 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Location of points 1 and 4 in coordinate system CP.  (Real) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">X12, X43 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Edge chord lengths in aerodynamic coordinate system.  (Real &ge; 0.0, but not both zero.) </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">The boxes and corner point nodes are numbered sequentially, beginning with EID.  The user should be careful to ensure that all box and corner point node numbers are unique. There can be overlapping ID&rsquo;s between the structural and aerodynamic model, but post processors may not be able to display any results. Also, non-unique corner ID&rsquo;s are allowed, but most post processor do not support this capability. </p>
            </li>
            <li>
               <p class="para_item">The number of division points is one greater than the number of boxes.  Thus, if NSPAN=3, the division points are 0.0, 0.333, 0.667, 1.000.  If the user supplies division points, the first and last points need not be 0.0 and 1.0 (in which case the corners of the panel would not be at the reference points). </p>
            </li>
            <li>
               <p class="para_item">A triangular element is formed if X12 or X43=0.0. </p>
            </li>
            <li>
               <p class="para_item">The element coordinate system is right-handed as shown in <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_3.html#ref61110');return(false);">Figure 12-</a>. 
               </p>
            </li>
            <li>
               <p class="para_item">The continuation is required. </p>
            </li>
            <li>
               <p class="para_item">It is recommended that NCHORD or LCHORD be chosen such that the typical box chord length &Delta; <em>x</em> satisfies the condition &Delta;<em>x</em> &lt; 0.08<em>V/f</em>. Recent studies indicate that .02 <em>V/f</em> is needed to get converged stability derivatives. Where <em>V</em> is the minimum velocity and <em>f</em>, in hertz, is the maximum frequency to be analyzed (see the <em><a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#aero:ref86112:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">NX Nastran Aeroelastic Analysis User&rsquo;s Guide</a>). </em></p>
            </li>
            <li>
               <p class="para_item">This entry can be used for two different aerodynamic theories:  Doublet-Lattice for subsonic and ZONA51 for supersonic.  The proper theory is selected based on the specification of Mach number on the MKAEROi or TRIM entry. </p><a name="ref61110"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc1-fig02.gif"></p>
               </div>
               <div class="title_figure">Figure. Element Coordinate System for Aerodynamic Panel </div>
            </li>
            <li><a name="igid_restriction1"></a><p class="para_item">CAERO1 and CAERO2 panels should be defined in an IGID increasing order. For example, if you have a CAERO1 or CAER02 card with EID1 and ... IGID1, and another with EID2 and ... IGID2, IGID2 must be greater than IGID1, independent of whether EID1 &lt; or &gt; EID2. Failure to follow this restriction will create an erroneous pressure distribution resulting in incorrect flutter results.</p>
            </li>
         </ol>
      </div>
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