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<p><br /></p>
<h2 id="refine-fault" class="uk-h3 uk-margin-remove">7. Refine Fault</h2>
<p>In step 5, we defined a fault surface (named <code class="language-plaintext highlighter-rouge">s_f</code>) intersecting the mesh. In
this section, we are going to refine the mesh where the fault intersects it.</p>
<p>The LaGriT command <code class="language-plaintext highlighter-rouge">intersect_elements</code> takes two meshes and creates an
element-based attribute in mesh1 that contains the number of elements in mesh2
that intersected the respective element in mesh1.</p>
<p>Performing the intersection between the mesh <code class="language-plaintext highlighter-rouge">MONAME</code> and fault <code class="language-plaintext highlighter-rouge">s_f</code>, storing
the intersection count in attribute <code class="language-plaintext highlighter-rouge">if_inter</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / select / MONAME
intersect_elements / MONAME / s_f / if_inter
</code></pre></div></div>
<p>The attribute <code class="language-plaintext highlighter-rouge">if_inter</code> will be non-zero everywhere there is an intersection,
and zero where there was not intersection. Taking advantage of this fact,
we can create an eltset to refine:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>eltset / e_refine / if_inter / gt / 0
refine / eltset / eltset get e_refine
cmo / DELATT / MONAME / if_inter
</code></pre></div></div>
<p>The element density has now increased where the mesh intersects <code class="language-plaintext highlighter-rouge">s_f</code>.
We can then run this step <em>again</em>, further refining elements along that intersection:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>intersect_elements / MONAME / s_f / if_inter
eltset / e_refine / if_inter / gt / 0
refine/ eltset / eltset get e_refine
cmo / setatt / MONAME / if_inter / 1 0 0 / 0
</code></pre></div></div>
<p>And finally, remove the attribute <code class="language-plaintext highlighter-rouge">if_inter</code>, as it is no longer needed:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / DELATT / MONAME / if_inter
</code></pre></div></div>
<p>At this point, many different mesh objects and surfaces still exist in memory from previous steps. Lets deallocate them and verify with the <code class="language-plaintext highlighter-rouge">memory</code> command:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / status / brief
cmo / status / MONAME
memory / verify
memory / print
cmo / delete / s_bndry
cmo / delete / mo_fence
cmo / delete / mo_bndry
cmo / delete / s_f
cmo / delete / s_2_fp
cmo / delete / s_1_fp
cmo / delete / s_2_fm
cmo / delete / s_1_fm
cmo / delete / s_2
cmo / delete / s_1
memory / verify
memory / print
</code></pre></div></div>
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<li class=""><a href="/pages/tutorial/stratigraphy/step_01.html">1. Building a Hex Mesh</a></li>
<li class=""><a href="/pages/tutorial/stratigraphy/step_02.html">2. Define Boundaries Using Point Sets</a></li>
<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_10_fehm.html">10.1 Write FEHM Files</a></li>
<li class=""><a href="/pages/tutorial/stratigraphy/step_10_exo.html">10.2 Write ExodusII Files</a></li>
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