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      <title>METHOD</title>
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      <div class="title_refTopic" id="xps10_pagetitle">METHOD </div>
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      <h4 class="refClassification">Real Eigenvalue Extraction Method Selection </h4>
      <p class="para_refTopic">Selects the real eigenvalue extraction parameters. </p>
      <div class="title_refCategory">Format: </div>
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      <div class="title_refCategory">Examples: </div>
      <div class="refCategoryContent"><pre class="indent">METHOD=33
METHOD(FLUID)=34</pre></div>
      <div class="title_refCategory">Describers:</div>
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                     <p class="para_th"><b class="uiTerm">Describer </b></p>
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                     <p class="para_th"><b class="uiTerm">Meaning </b></p>
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                     <p class="para_td">STRUCTURE or FLUID </p>
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                     <p class="para_td">The referenced EIGR or EIGRL Bulk Data entry is applied to the structural or fluid portion of the model. (Default = STRUCTURE) </p>
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                     <p class="para_td">n </p>
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                     <p class="para_td">Set identification number of an EIGR or EIGRL Bulk Data entry for normal modes or modal formulation, or an EIGB or EIGRL entry for buckling. (Integer&gt;0) </p>
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      <div class="title_refCategory">Remarks: </div>
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            <li>
               <p class="para_item">An eigenvalue extraction method must be selected when extracting real eigenvalues using DMAP modules READ or REIGL. </p>
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               <p class="para_item">If the set identification number selected is present on both EIGRL and EIGR and/or EIGB entries, the EIGRL entry will be used. This entry requests the Lanczos eigensolution method. </p>
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            <li>
               <p class="para_item">METHOD(FLUID) permits a different request of EIGR or EIGRL for the fluid portion of the model from the structural portion of the model in coupled fluid-structural analysis. See the <em>NX Nastran User&rsquo;s Guide</em>. 
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                     <p class="para_item">If not specified, then the METHOD selection of the structure will be used for the fluid and modal reduction will not be performed on the fluid portion of the model in the dynamic solution sequences. </p>
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                  <li>
                     <p class="para_item">The METHOD(FLUID) and METHOD(STRUCTURE) may be specified simultaneously in the same subcase for the residual structure only. Do not specify METHOD(FLUID) in a superelement subcase even if the superelement contains fluid elements. </p>
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                     <p class="para_item">The auto-omit feature is not recommended. (See the <em>NX Nastran User&rsquo;s Guide</em>.) Therefore, only those methods of eigenvalue extraction that can process a singular mass matrix should be used; e.g., EIGRL entry or MGIV and MHOU on the EIGR entry. 
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