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      <title>RADBC</title>
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      <div class="title_refTopic" id="xps10_pagetitle">RADBC </div>
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      <h4 class="refClassification">Space Radiation Specification </h4>
      <p class="para_refTopic">Specifies an CHBDYi element face for application of radiation boundary conditions. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="9.84*">
               <col span="1" width="11.29*">
               <col span="1" width="9.84*">
               <col span="1" width="10.75*">
               <col span="1" width="9.84*">
               <col span="1" width="9.84*">
               <col span="1" width="9.84*">
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               <col span="1" width="9.11*">
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               <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>
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                  <th align="center" colspan="1" rowspan="1">
                     <p class="para_th">6 </p>
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                  <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>
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            </thead>
            <tbody>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADBC </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">NODAMB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">FAMB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">CNTRLND </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">-etc.- </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>
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      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="9.82*">
               <col span="1" width="11.63*">
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               <col span="1" width="9.82*">
               <col span="1" width="9.82*">
               <col span="1" width="9.82*">
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            <tbody>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">RADBC </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">1.0 </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">10 </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">
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               <col span="1" width="16*">
               <col span="1" width="84*">
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                  <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">NODAMB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Ambient point for radiation exchange.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">FAMB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Radiation view factor between the face and the ambient point.  (Real &ge; 0.0) </p>
                  </td>
               </tr>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CNTRLND </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Control point for radiation boundary condition.  (Integer &ge; 0; Default=0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">EIDi </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CHBDYi element identification number.  (or &ldquo;THRU&rdquo; or &ldquo;BY&rdquo;) </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 basic exchange relationship is: </p>
               <ul>
                  <li>
                     <p class="para_item">if CNTRLND=0, then <em>q</em>=&sigma; · FAMB · (ϵ<em><sub class="subscript">e</sub></em><em>T</em>4<em><sub class="subscript">e</sub></em> − &alpha;<em><sub class="subscript">e</sub></em><em>T</em><sup class="superscript">4</sup><sub class="subscript">amb</sub>) 
                     </p>
                  </li>
                  <li>
                     <p class="para_item">if CNTRLND &gt; 0, then </p>
                     <p class="para_item"><em>q</em>=&sigma; · FAMB · <em>u</em><sub class="subscript">CNTRLND</sub> · (ϵ<em><sub class="subscript">e</sub></em><em>T</em><sup class="superscript">4</sup><em><sub class="subscript">e</sub></em> − &alpha;<em><sub class="subscript">e</sub></em><em>T</em><sup class="superscript">4</sup><sub class="subscript">amb</sub>) 
                     </p>
                  </li>
               </ul>
            </li>
            <li>
               <p class="para_item">NODAMB is treated as a black body with its own ambient temperature for radiation exchange between the surface element and space.  No surface element that is a member of a radiation enclosure cavity may also have a radiation boundary condition applied to it. </p>
            </li>
            <li>
               <p class="para_item">Two PARAM entries are required when stipulating radiation heat transfer: </p>
               <ul>
                  <li>
                     <p class="para_item">ABS defines the absolute temperature scale;  this value is added internally to any specified temperature given in the problem.  Upon solution completion, this value is subtracted internally from the solution vector. </p>
                  </li>
                  <li>
                     <p class="para_item">SIGMA (&sigma;) is the Stefan-Boltzmann constant. </p>
                  </li>
               </ul>
            </li>
            <li>
               <p class="para_item">RADBC allows for surface radiation to space in the absence of any cavity behavior.  The emissivity and absorptivity are supplied from a RADM entry. </p>
            </li>
            <li>
               <p class="para_item">When using &ldquo;THRU&rdquo; or &ldquo;BY&rdquo;, all intermediate referenced CHBDYi surface elements must exist. </p>
            </li>
         </ol>
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