289 lines
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HTML
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<li><a href="/pages/tutorial/index.html">Tutorials & Examples</a></li>
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<li><span>Stratigraphic Hex Mesh Tutorial</span></li>
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<p><br /></p>
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<h2 id="convert-hex-mesh-to-tet" class="uk-h3 uk-margin-remove">9. Convert Hex Mesh to Tet</h2>
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<p>In this final step, we will convert our mesh from hexahedral to tetrahedral
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elements.</p>
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<p>Create an empty mesh object, <code class="language-plaintext highlighter-rouge">motet</code>, and copy all nodes from <code class="language-plaintext highlighter-rouge">MONAME</code>
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(or, <code class="language-plaintext highlighter-rouge">mohex_octree</code>) to <code class="language-plaintext highlighter-rouge">motet</code>:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / create / motet
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copypts / motet / mohex_octree
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</code></pre></div></div>
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<p>Next, reset the <code class="language-plaintext highlighter-rouge">imt</code> and <code class="language-plaintext highlighter-rouge">itp</code> variables and connect the nodes into
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tetrahedral elements:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / setatt / motet / imt / 1 0 0 / 1
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cmo / setatt / motet / itp / 1 0 0 / 0
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connect
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resetpts / itp
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</code></pre></div></div>
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<p>Interpolate the node and cell ‘colors’ over the tetrahedral mesh, using
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<code class="language-plaintext highlighter-rouge">interpolate / voronoi</code> for node-to-node interpolations, and
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<code class="language-plaintext highlighter-rouge">interpolate / map</code> for cell-to-cell interpolations:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>interpolate / voronoi / motet / imt / 1 0 0 / mohex_octree / imt
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interpolate / map / motet / itetclr / 1 0 0 / mohex_octree / itetclr
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</code></pre></div></div>
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<p>Recall in step 5 that we set <code class="language-plaintext highlighter-rouge">imt</code> and <code class="language-plaintext highlighter-rouge">itetclr</code> to the value 7 for all
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nodes and elements that weren’t captured by the surface-created element sets.
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We can use the command <code class="language-plaintext highlighter-rouge">rmmat / 7</code> to remove all nodes and elements with
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<code class="language-plaintext highlighter-rouge">imt</code> and <code class="language-plaintext highlighter-rouge">itetclr</code> values of 7:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>rmmat / 7
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rmpoint / compress
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resetpts / itp
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</code></pre></div></div>
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<p>Check the mesh that it has all positive element volumes and no bad aspect ratios.
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Use the <code class="language-plaintext highlighter-rouge">quality</code> command for a report on these mesh quantities.</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>quality
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epsilonl, epsilonaspect: 1.3230281E-09 2.3158330E-27
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--------------------------------------------
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elements with aspect ratio < .01: 0
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elements with aspect ratio b/w .01 and .02: 0
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elements with aspect ratio b/w .02 and .05: 0
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elements with aspect ratio b/w .05 and .1 : 0
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elements with aspect ratio b/w .1 and .2 : 18
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elements with aspect ratio b/w .2 and .5 : 20538
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elements with aspect ratio b/w .5 and 1. : 631394
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min aspect ratio = 0.1613E+00 max aspect ratio = 0.9377E+00
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epsilonvol: 8.8249408E-03
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---------------------------------------
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element volumes b/w 0.2500E+03 and 0.8706E+03: 43109
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element volumes b/w 0.8706E+03 and 0.3031E+04: 273639
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element volumes b/w 0.3031E+04 and 0.1056E+05: 98379
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element volumes b/w 0.1056E+05 and 0.3676E+05: 63075
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element volumes b/w 0.3676E+05 and 0.1280E+06: 173748
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min volume = 2.5000000E+02 max volume = 1.2800000E+05
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-----------------------------------------------------------
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651950 total elements evaluated.
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</code></pre></div></div>
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<p>Finally, write the mesh object to AVS UCD file format and signal the EOF
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<code class="language-plaintext highlighter-rouge">finish</code> command:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>dump/avs/tet_mesh.inp/motet
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finish
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</code></pre></div></div>
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<li class=""><a href="/pages/tutorial/stratigraphy/index.html">Index</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_01.html">1. Building a Hex Mesh</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_02.html">2. Define Boundaries Using Point Sets</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_03.html">3. Constructing Stratigraphy</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_04.html">4. Map Surfaces to Mesh</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_05.html">5. Constructing a Fault</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_06.html">6. Truncate with Polyline</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_07.html">7. Refine Fault</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_08.html">8. Insert Wells</a></li>
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<li class="uk-active"><a href="#convert-hex-mesh-to-tet">9. Convert Hex Mesh to Tet</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_10_fehm.html">10.1 Write FEHM Files</a></li>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_10_exo.html">10.2 Write ExodusII Files</a></li>
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