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<li><span>Stratigraphic Hex Mesh Tutorial</span></li>
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<img data-src="/pages/tutorial/stratigraphy/images/03_hex_01_set_imt_itetclr_threshold_remove_material3.png" width="1800" height="1200" alt="" uk-cover="" uk-img="target: !.uk-slideshow-items" />
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<p><br /></p>
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<h2 id="map-surfaces-to-mesh" class="uk-h3 uk-margin-remove">4. Map Surfaces to Mesh</h2>
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<p>Now that the straitipgrahy has been modeled and we are comfortable with our
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results, we will map their spanning domain to the parent mesh. As done with the
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psets above, this process will be driven via attributes.</p>
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<p>We now have two planes spanning the X,Y domain of the mesh. These planes can be
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leveraged to create different material IDs at different regions of the
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subsurface.</p>
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<p>For example,</p>
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<ul>
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<li>For all nodes/cells above plane 1, set their material ID to 1</li>
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<li>For all nodes/cells between plane 1 and plane 2, set their material ID to 2</li>
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<li>For all nodes/cells below plane 2, set their material ID to 3</li>
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</ul>
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<p>This process can be accomplished by:</p>
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<ol>
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<li>Defining the above regions using the <code class="language-plaintext highlighter-rouge">region</code> keyword</li>
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<li>Capturing the relevant nodes and elements that fall within the defined regions</li>
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<li>Setting the node and element material IDs based on the <code class="language-plaintext highlighter-rouge">psets</code> and <code class="language-plaintext highlighter-rouge">eltsets</code></li>
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</ol>
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<h3 id="41-defining-regions">4.1 Defining Regions</h3>
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<p>The syntax for <code class="language-plaintext highlighter-rouge">region</code> is:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> region / region_name / region_definition
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</code></pre></div></div>
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<p>where <code class="language-plaintext highlighter-rouge">region_definition</code> is a string composed of boolean operators and
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instantiated <code class="language-plaintext highlighter-rouge">surface</code> objects.</p>
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<p>Recall that we have defined two planes, <code class="language-plaintext highlighter-rouge">mosurf1</code> and <code class="language-plaintext highlighter-rouge">mosurf2</code>. We would like
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to generate the <code class="language-plaintext highlighter-rouge">region</code> objects from these planes, but the arguments for
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<code class="language-plaintext highlighter-rouge">region</code> require <code class="language-plaintext highlighter-rouge">surface</code> objects.</p>
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<p>Fortunately, we can map the planes to a <code class="language-plaintext highlighter-rouge">surface</code> very easily. The syntax for
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generating a <code class="language-plaintext highlighter-rouge">surface</code> object from a quad or triangle mesh is:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> surface / surface_name / reflect / sheet / input_mesh
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</code></pre></div></div>
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<p>The two planes can then be mapped to surface objects:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>surface / s_1 / reflect / sheet / mosurf1
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surface / s_2 / reflect / sheet / mosurf2
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</code></pre></div></div>
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<p>And finally, we can remove the plane meshes and define regions:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / delete / mosurf1
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cmo / delete / mosurf2
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cmo / select / MONAME
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region / r_1 / le s_1
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region / r_2 / gt s_1 and le s_2
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region / r_3 / gt s_2
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</code></pre></div></div>
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<h3 id="42-creating-eltsets-and-psets-from-regions">4.2 Creating Eltsets and PSets from Regions</h3>
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<p>Point sets and element sets can easily be created through region objects.
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The syntax is:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> pset / pset_name / region / region_object / 1,0,0
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eltset / eltset_name / region / region_object
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</code></pre></div></div>
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<p>Applying this to our <code class="language-plaintext highlighter-rouge">region</code> objects yields:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>pset / p_r_1 / region / r_1 / 1 0 0
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pset / p_r_2 / region / r_2 / 1 0 0
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pset / p_r_3 / region / r_3 / 1 0 0
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eltset / e_r_1 / region / r_1
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eltset / e_r_2 / region / r_2
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eltset / e_r_3 / region / r_3
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</code></pre></div></div>
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<h3 id="43-setting-attributes-from-eltsets-and-psets">4.3 Setting Attributes from Eltsets and PSets</h3>
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<p>Recall that the node attribute <code class="language-plaintext highlighter-rouge">imt</code> holds the ‘node colors’ of the mesh, and
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cell attribute <code class="language-plaintext highlighter-rouge">itetclr</code> stores the ‘cell colors’ (or material ID).</p>
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<p>Let’s use the defined <code class="language-plaintext highlighter-rouge">pset</code>s and <code class="language-plaintext highlighter-rouge">eltset</code>s to change these:</p>
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<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / setatt / MONAME / imt / pset get p_r_1 / 1
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cmo / setatt / MONAME / imt / pset get p_r_2 / 2
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cmo / setatt / MONAME / imt / pset get p_r_3 / 3
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cmo / setatt / MONAME / itetclr / eltset get e_r_1 / 1
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cmo / setatt / MONAME / itetclr / eltset get e_r_2 / 2
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cmo / setatt / MONAME / itetclr / eltset get e_r_3 / 3
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</code></pre></div></div>
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<p>Our mesh’s cells and nodes now store information about their intersections
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with the cut-planes. Visualizing <code class="language-plaintext highlighter-rouge">itetclr</code>, we can see that this has behaved
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as expected:</p>
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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="uk-active"><a href="#map-surfaces-to-mesh">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=""><a href="/pages/tutorial/stratigraphy/step_09.html">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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<p>© 2019 Los Alamos National Laboratory</p>
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