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      <title>CHBDYG</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CHBDYG </div>
      <hr noshade="true">
      <h4 class="refClassification">Geometric Surface Element Definition (Grid Form) </h4>
      <p class="para_refTopic">Defines a boundary condition surface element without reference to a property entry. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10.02*">
               <col span="1" width="10.02*">
               <col span="1" width="10.02*">
               <col span="1" width="10.02*">
               <col span="1" width="10.02*">
               <col span="1" width="10.02*">
               <col span="1" width="10.78*">
               <col span="1" width="10.98*">
               <col span="1" width="8.87*">
               <col span="1" width="9.25*">
            </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="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CHBDYG </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">TYPE </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">IVIEWF </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">IVIEWB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">RADMIDF </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">RADMIDB </p>
                  </td>
                  <td align="center" bgcolor="gray" 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>
               <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">G1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G8 </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="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CHBDYG </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">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">AREA4 </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">3 </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">2 </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>
               <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">100 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">103 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">102 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">101 </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">&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">&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="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">EID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Surface element identification number.  (Unique Integer &gt; 0 among all elemental entries) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">TYPE </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Surface type.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#ref97473a');return(false);">40-3</a>. (Character) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">IVIEWF </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">A VIEW entry identification number for the front face.  (Integer &gt; 0; see Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_30.html#ref43335');return(false);">39-2</a> for the default.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">IVIEWB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">A VIEW entry identification number for the back face.  (Integer &gt; 0; see Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_30.html#ref43335');return(false);">39-2</a> for the default.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADMIDF </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADM identification number for front face of the surface element.  (Integer &gt; 0; see Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#refOf96j1eflori');return(false);">40-2</a> for the default.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADMIDB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADM identification number for the back face ofthe surface element.  (Integer &ge; 0; see Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#refOf96j1eflori');return(false);">40-2</a> for the default.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Gi </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point IDs of grids bounding the surface.  (Integer &gt; 0) </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">EID is a unique ID associated with a particular surface element as defined by the grid points. </p>
            </li>
            <li><a name="refOf96j1eflori"></a><p class="para_item">The defaults for TYPE, IVIEWF, IVIEWB, RADMIDF, and RADMIDB may be specified on the BDYOR entry.  If a particular field is blank on both the CHBDYG entry and the BDYOR entry, then the default is zero. </p>
            </li>
            <li><a name="ref97473a"></a><p class="para_item">TYPE specifies the kind of element surface; allowed types are:  REV, AREA3, AREA4, AREA6, and AREA8.  See <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#ref64384');return(false);">Figure 12-</a>, <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#ref12923');return(false);">Figure 12-</a>, and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_31.html#ref21064');return(false);">Figure 12-</a>. 
               </p>
               <ul>
                  <li>
                     <p class="para_item">TYPE = REV </p>
                     <p class="para_item">The &ldquo;REV&rdquo; type has two primary grid points that must lie in the x-z plane of the basic coordinate system with x &gt; 0.  A midside grid point G3 is optional and supports convection or heat flux from the edge of the six-noded CTRIAX6 element.  The defined area is a conical section with z as the axis of symmetry.  A property entry is required for convection, radiation, or thermal vector flux.  Automatic view factor calculations with VIEW data are not supported for the REV option. </p><a name="ref64384"></a><div class="figure">
                        <p align="center"><img align="bottom" src="graphics/bulkc1-fig23.gif"></p>
                     </div>
                     <div class="title_figure">Figure. Normal Vector for CHBDYG Element of Type &ldquo;REV&rdquo; </div>
                     <p class="para_item">The unit normal lies in the x-z plane, and is given by </p>
                     <p align="center"><img align="bottom" src="graphics/bulkc1-equ02.gif"></p>
                     <p class="para_item"><img align="bottom" src="graphics/bulkc1-ufig12.gif" border="0"> is the unit vector in the y direction. 
                     </p>
                  </li>
                  <li>
                     <p class="para_item">TYPE = AREA3, AREA4, AREA6, or AREA8 </p>
                     <p class="para_item">These types have three and four primary grid points, respectively, that define a triangular or quadrilateral surface and must be ordered to go around the boundary.  A property entry is required for convection, radiation, or thermal vector flux. </p><a name="ref12923"></a><div class="figure">
                        <p align="left"><img align="bottom" src="graphics/bulkc1-fig24.gif"></p>
                     </div>
                     <div class="title_figure">Figure. TYPE Examples </div><a name="ref21064"></a><div class="figure">
                        <p align="center"><img align="bottom" src="graphics/bulkc1-fig25.gif"></p>
                     </div>
                     <div class="title_figure">Figure. Normal Vector for CHBDYG Element of Types &ldquo;AREAi&rdquo; </div>
                     <p class="para_item">The unit normal vector is given by </p>
                     <p align="center"><img align="bottom" src="graphics/bulkc1-equ03.gif"></p>
                     <p class="para_item">(G3 is used for triangles, and G4 is used for quadrilaterals.) </p>
                  </li>
               </ul>
            </li>
            <li>
               <p class="para_item">For defining the front face, the right-hand rule is used on the sequence G1 to G2 to ... Gn of grid points. </p>
            </li>
            <li>
               <p class="para_item">If the surface element is to be used in the calculation of view factors, it must have an associated VIEW entry. </p>
            </li>
            <li>
               <p class="para_item">All conduction elements to which any boundary condition is to be applied must be individually identified with one of the surface element entries:  CHBDYE, CHBDYG, or CHBDYP. </p>
            </li>
            <li>
               <p class="para_item">See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_30.html#refxj96j3celori');return(false);">39-9</a> of CHBDYE for application of boundary conditions using CHBDYG entries and a discussion of front and back faces. 
               </p>
            </li>
         </ol>
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