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<p><br /></p>
<h2 id="insert-well" class="uk-h3 uk-margin-remove">8. Insert Wells</h2>
<p>In this step, we will generate two cylindrical wells, refine the mesh
<code class="language-plaintext highlighter-rouge">MONAME</code> around them, and identify a line of nodes that will be the well
source/sink for boundary conditions (ultimately writing these nodes
to <code class="language-plaintext highlighter-rouge">zone</code> files).</p>
<h3 id="81-generating-cylindrical-tetrahedral-wells">8.1 Generating Cylindrical Tetrahedral Wells</h3>
<p>First, we define variables for the wells position (<code class="language-plaintext highlighter-rouge">XWELL</code>,<code class="language-plaintext highlighter-rouge">YWELL</code>), radius (<code class="language-plaintext highlighter-rouge">RADIUS_WELL</code>), and number of nodes across the cylindrical radius
(<code class="language-plaintext highlighter-rouge">NRADIUS</code>):</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>define / XWELL1 / 1234.56
define / YWELL1 / 1987.65
define / XWELL2 / 2243.21
define / YWELL2 / 1212.34
define / RADIUS_WELL / 25.0
define / NRADIUS / 2
</code></pre></div></div>
<p>Now, we create a cylindrical point cloud defining the first well using
<code class="language-plaintext highlighter-rouge">createpts / rtz</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / create / mo_well1 / / / tet
createpts / rtz / NRADIUS 9 NZ / 0. 0. 3100. / RADIUS_WELL 360. 1500. / 1 1 1
</code></pre></div></div>
<p>This creates a point cloud centered around (0,0,0) with a radius of <code class="language-plaintext highlighter-rouge">RADIUS_WELL</code>, an angular component spanning a full 360 degrees (<code class="language-plaintext highlighter-rouge">φ = {0., 360.}</code>), and a Z range of <code class="language-plaintext highlighter-rouge">{3100.,1500.}</code>.</p>
<p>Run <code class="language-plaintext highlighter-rouge">filter</code>, <code class="language-plaintext highlighter-rouge">rmpoint / compress</code>, and set <code class="language-plaintext highlighter-rouge">imt</code> to 1 for the well:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>filter / 1 0 0
rmpoint / compress
cmo / setatt / mo_well1 / imt / 1 0 0 / 1
</code></pre></div></div>
<p>Next, connect the point cloud into a tetrahedral mesh and translate the
X and Y origin to <code class="language-plaintext highlighter-rouge">{XWELL1,YWELL1}</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>connect
resetpts / itp
cmo / printatt / mo_well1 / -xyz- / minmax
trans / 1 0 0 / 0. 0. 0. / XWELL1 YWELL1 0.0
cmo / printatt / mo_well1 / -xyz- / minmax
</code></pre></div></div>
<p>The first well mesh object has been generated. Repeat this process with different parameters to create the second well:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / create / mo_well2 / / / tet
createpts / rtz / NRADIUS 9 NZ / 0. 0. 3100. / RADIUS_WELL 360. 2200. / 1 1 1
filter / 1 0 0
rmpoint / compress
cmo / setatt / mo_well1 / imt / 1 0 0 / 1
connect
resetpts / itp
cmo / printatt / mo_well2 / -xyz- / minmax
trans / 1 0 0 / 0. 0. 0. / XWELL2 YWELL2 0.0
cmo / printatt / mo_well2 / -xyz- / minmax
</code></pre></div></div>
<p>Finally, join the two distinct wells into a single mesh object with <code class="language-plaintext highlighter-rouge">addmesh / merge</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>addmesh / merge / mo_wells / mo_well1 mo_well2
</code></pre></div></div>
<h3 id="82-refining-moname-around-the-wells">8.2 Refining <code class="language-plaintext highlighter-rouge">MONAME</code> around the wells</h3>
<p>As we did for the fault in step 7, we refine the main mesh <code class="language-plaintext highlighter-rouge">MONAME</code> around the wells:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># First pass refinement
cmo / select / MONAME
intersect_elements / MONAME / mo_wells / if_inter
eltset / e_refine / if_inter / gt / 0
refine/ eltset / eltset get e_refine
cmo / setatt / MONAME / if_inter / 1 0 0 / 0
eltset / e_refine / delete
# Second pass refinement
cmo / select / MONAME
intersect_elements / MONAME / mo_wells / if_inter
eltset / e_refine / if_inter / gt / 0
refine/ eltset / eltset get e_refine
cmo / setatt / MONAME / if_inter / 1 0 0 / 0
eltset / e_refine / delete
# Third pass refinement
cmo / select / MONAME
intersect_elements / MONAME / mo_wells / if_inter
eltset / e_refine / if_inter / gt / 0
refine/ eltset / eltset get e_refine
cmo / setatt / MONAME / if_inter / 1 0 0 / 0
eltset / e_refine / delete
</code></pre></div></div>
<p>The refinement process returns a octree grid object, which stores information about parent-children relationships, among other properties. Its important, as the prepare to finalize the mesh for exporting, to strip this information and convert the octree grid object to a standard mesh object.</p>
<p>This conversion is done through the <code class="language-plaintext highlighter-rouge">grid2grid / tree_to_fe</code> command:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>grid2grid / tree_to_fe / mohex_octree / mohex
define / MONAME / mohex_octree
</code></pre></div></div>
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<h3 id="83-writing-zone-files-based-on-well-distances">8.3 Writing <code class="language-plaintext highlighter-rouge">zone</code> files based on well distances</h3>
<p>The <code class="language-plaintext highlighter-rouge">zone</code> files are lists of node numbers in <a href="https://fehm.lanl.gov">FEHM</a> file format and used to identify materials, well source/sinks, and boundary conditions.</p>
<p>In this subsection, we will generate <code class="language-plaintext highlighter-rouge">zone</code> files describing all nodes within 32, 16, 8, 4, 2 and 1 meters of the wells.</p>
<p>To begin, we will compute the well point cloud again, as we did above. First, for well 1:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / create / mo_pts1
createpts / rtz / 2 2 1000 / 0. 0. 3100. / 0.0 360. 2200. / 1 1 1
trans / 1 0 0 / 0. 0. 0. / XWELL1 YWELL1 0.0
</code></pre></div></div>
<p>Then for well 2:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / create / mo_pts2
createpts / rtz / 2 2 1000 / 0. 0. 3100. / 0.0 360. 2200. / 1 1 1
trans / 1 0 0 / 0. 0. 0. / XWELL2 YWELL2 0.0
</code></pre></div></div>
<p>and joining them into a single mesh object, <code class="language-plaintext highlighter-rouge">mo_pts</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>addmesh / merge / mo_pts / mo_pts1 / mo_pts2
cmo / select / mo_pts
filter / 1 0 0
rmpoint / compress
</code></pre></div></div>
<p>Next, we will compute a distance field attribute, <code class="language-plaintext highlighter-rouge">dfield_well</code>, which is a node-based attribute storing the Euclidean distance from <code class="language-plaintext highlighter-rouge">node_i</code> in one mesh to the closest node in another mesh. In other words, all nodes in <code class="language-plaintext highlighter-rouge">MONAME</code> store their distance to the closest well (<code class="language-plaintext highlighter-rouge">mo_pts</code>) node.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>compute / distance_field / MONAME / mo_pts / dfield_well
</code></pre></div></div>
<p>Clean up unneeded mesh objects:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / delete / mo_pts1
cmo / delete / mo_pts2
cmo / delete / mo_pts
cmo / delete / mo_wells
cmo / delete / mo_well1
cmo / delete / mo_well2
</code></pre></div></div>
<p>And finally, for each mesh-to-well distance in {32,16,8,4,2,1} (which is stored in <code class="language-plaintext highlighter-rouge">dfield_well</code>), (i) create a pset object
containing all nodes within that distance, and (ii) write those nodes to a <code class="language-plaintext highlighter-rouge">zone</code> file:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cmo / select / MONAME
pset / pwell / attribute / dfield_well / 1 0 0 / le / 1.0
pset / pwell / zone / zone_radius_01.0.zone
pset / pwell / attribute / dfield_well / 1 0 0 / le / 2.0
pset / pwell / zone / zone_radius_02.0.zone
pset / pwell / attribute / dfield_well / 1 0 0 / le / 4.0
pset / pwell / zone / zone_radius_04.0.zone
pset / pwell / attribute / dfield_well / 1 0 0 / le / 8.0
pset / pwell / zone / zone_radius_08.0.zone
pset / pwell / attribute / dfield_well / 1 0 0 / le / 16.0
pset / pwell / zone / zone_radius_16.0.zone
pset / pwell / attribute / dfield_well / 1 0 0 / le / 32.0
pset / pwell / zone / zone_radius_32.0.zone
</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>
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