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<section id="ls-dyna-mesh-reader">
<h1>LS-DYNA Mesh Reader<a class="headerlink" href="#ls-dyna-mesh-reader" title="Link to this heading">#</a></h1>
<p>This library can be used to read in LS-DYNA meshes stored within keyword
(<code class="docutils literal notranslate"><span class="pre">*.k</span></code>, <code class="docutils literal notranslate"><span class="pre">*.key</span></code>, <code class="docutils literal notranslate"><span class="pre">*.dyn</span></code>) files, also known as keyword format “input
decks”. Full documentation for this repository can be found at <a class="reference external" href="https://akaszynski.github.io/lsdyna-mesh-reader/">lsdyna-mesh-reader Documentation</a>.</p>
<p>Many of these example files were obtained from the excellent documentation at
<a class="reference external" href="https://www.dynaexamples.com/">LS-DYNA Examples</a>.</p>
<section id="motivation">
<h2>Motivation<a class="headerlink" href="#motivation" title="Link to this heading">#</a></h2>
<p>Despite its popularity, there doesn’t appear to be a reader for LS-DYNA keyword
files. I need a reader for a closed source project and hope that this helps
someone else who also wishes to read in these files. It borrows from
<a class="reference external" href="https://github.com/akaszynski/mapdl-archive">mapdl-archive</a> as MAPDL also
follows many of the same FORTRAN conventions when writing out FEMs.</p>
</section>
<section id="installation">
<h2>Installation<a class="headerlink" href="#installation" title="Link to this heading">#</a></h2>
<p>Install the fully featured reader with visualization with:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>lsdyna-mesh-reader<span class="o">[</span>pyvista<span class="o">]</span>
</pre></div>
</div>
<p>If you only need the node and element arrays and not any VTK features
(e.g. plotting or
<a class="reference external" href="https://docs.pyvista.org/api/core/_autosummary/pyvista.unstructuredgrid">UnstructuredGrid</a>
representation), install the basic library with:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>lsdyna-mesh-reader
</pre></div>
</div>
<section id="examples">
<h3>Examples<a class="headerlink" href="#examples" title="Link to this heading">#</a></h3>
<p>Before going through a basic example, let’s talk about how these “decks” are organized. Each keyword file contains “keywords” that describe the start of sections of “cards”. This terminology dates back to when DYNA3D was developed in 1976 where programs were written on <a class="reference external" href="https://en.wikipedia.org/wiki/Punched_card">punch cards</a>.</p>
<p>To read in nodes and elements, we have to read in one or more node and element sections, each starting with <code class="docutils literal notranslate"><span class="pre">*NODE</span></code> or <code class="docutils literal notranslate"><span class="pre">*ELEMENT_SOLID</span></code>. This library loads in those raw sections as well as parsed sections as a higher level abstraction.</p>
<p>Let’s start by loading the <a class="reference external" href="https://www.dynaexamples.com/introduction/intro-by-a.-tabiei/contact/contact-eroding-i">Contact Eroding
I</a>
example deck.</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span>
<span class="n">Load</span> <span class="n">the</span> <span class="n">birdball</span> <span class="n">deck</span><span class="o">.</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">lsdyna_mesh_reader</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">lsdyna_mesh_reader</span> <span class="kn">import</span> <span class="n">examples</span>
<span class="o">>>></span> <span class="n">deck</span> <span class="o">=</span> <span class="n">lsdyna_mesh_reader</span><span class="o">.</span><span class="n">Deck</span><span class="p">(</span><span class="n">examples</span><span class="o">.</span><span class="n">birdball</span><span class="p">)</span>
<span class="n">LSDYNA</span> <span class="n">Deck</span> <span class="k">with</span><span class="p">:</span>
<span class="n">Node</span> <span class="n">sections</span><span class="p">:</span> <span class="mi">1</span>
<span class="n">Element</span> <span class="n">Solid</span> <span class="n">sections</span><span class="p">:</span> <span class="mi">1</span>
<span class="n">Element</span> <span class="n">Shell</span> <span class="n">sections</span><span class="p">:</span> <span class="mi">1</span>
</pre></div>
</div>
<p>We can now inspect one of the node sections:</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">node_section</span> <span class="o">=</span> <span class="n">deck</span><span class="o">.</span><span class="n">node_sections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="gp">>>> </span><span class="n">node_section</span>
<span class="go">NodeSection containing 1281 nodes</span>
<span class="go">| NID | X | Y | Z | tc | rc |</span>
<span class="go">|-------|---------------|---------------|---------------|--------|--------|</span>
<span class="go"> 1 -2.30940104e+00 -2.30940104e+00 -2.30940104e+00 0 0</span>
<span class="go"> 2 -2.03960061e+00 -2.03960061e+00 -2.03960061e+00 0 0</span>
<span class="go"> 3 -1.76980031e+00 -1.76980031e+00 -1.76980031e+00 0 0</span>
<span class="go"> 4 -1.50000000e+00 -1.50000000e+00 -1.50000000e+00 0 0</span>
<span class="go"> 5 -2.59364843e+00 -1.59561157e+00 -2.59364843e+00 0 0</span>
<span class="go"> 6 -2.22909880e+00 -1.39707434e+00 -2.22909880e+00 0 0</span>
<span class="go"> 7 -1.86454940e+00 -1.19853711e+00 -1.86454940e+00 0 0</span>
<span class="go"> 8 -1.50000000e+00 -1.00000000e+00 -1.50000000e+00 0 0</span>
<span class="go"> 9 -2.76911068e+00 -8.14893484e-01 -2.76911068e+00 0 0</span>
<span class="go"> 10 -2.34607387e+00 -7.09928930e-01 -2.34607387e+00 0 0</span>
<span class="go">...</span>
</pre></div>
</div>
<p>We can directly access the node IDs and arrays of the node section:</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="n">Node</span> <span class="n">IDs</span>
<span class="o">>>></span> <span class="n">node_section</span><span class="o">.</span><span class="n">nid</span>
<span class="n">array</span><span class="p">([</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="o">...</span><span class="p">,</span> <span class="mi">1342</span><span class="p">,</span> <span class="mi">1343</span><span class="p">,</span> <span class="mi">1344</span><span class="p">],</span> <span class="n">dtype</span><span class="o">=</span><span class="n">int32</span><span class="p">)</span>
<span class="n">Node</span> <span class="n">coordinates</span>
<span class="o">>>></span> <span class="n">node_section</span><span class="o">.</span><span class="n">coordinates</span>
<span class="n">array</span><span class="p">([[</span> <span class="o">-</span><span class="mf">2.30940104</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.30940104</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.30940104</span><span class="p">],</span>
<span class="p">[</span> <span class="o">-</span><span class="mf">2.03960061</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.03960061</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.03960061</span><span class="p">],</span>
<span class="p">[</span> <span class="o">-</span><span class="mf">1.76980031</span><span class="p">,</span> <span class="o">-</span><span class="mf">1.76980031</span><span class="p">,</span> <span class="o">-</span><span class="mf">1.76980031</span><span class="p">],</span>
<span class="o">...</span><span class="p">,</span>
<span class="p">[</span> <span class="o">-</span><span class="mf">4.</span> <span class="p">,</span> <span class="o">-</span><span class="mf">10.</span> <span class="p">,</span> <span class="mf">0.</span> <span class="p">],</span>
<span class="p">[</span> <span class="o">-</span><span class="mf">2.</span> <span class="p">,</span> <span class="o">-</span><span class="mf">10.</span> <span class="p">,</span> <span class="mf">0.</span> <span class="p">],</span>
<span class="p">[</span> <span class="mf">0.</span> <span class="p">,</span> <span class="o">-</span><span class="mf">10.</span> <span class="p">,</span> <span class="mf">0.</span> <span class="p">]])</span>
</pre></div>
</div>
<p>The same can be done for both the solid and shell element sections.</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">deck</span><span class="o">.</span><span class="n">element_solid_sections</span> <span class="c1"># or deck.element_shell_sections</span>
<span class="go">[ElementSolidSection containing 816 elements</span>
<span class="go"> | EID | PID | N1 | N2 | N3 | N4 | N5 | N6 | N7 | N8 |</span>
<span class="go"> |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------|</span>
<span class="go"> 1 1 1 2 6 5 17 18 22 21</span>
<span class="go"> 2 1 2 3 7 6 18 19 23 22</span>
<span class="go"> 3 1 3 4 8 7 19 20 24 23</span>
<span class="go"> 4 1 5 6 10 9 21 22 26 25</span>
<span class="go"> 5 1 6 7 11 10 22 23 27 26</span>
<span class="go"> 6 1 7 8 12 11 23 24 28 27</span>
<span class="go"> 7 1 9 10 14 13 25 26 30 29</span>
<span class="go"> 8 1 10 11 15 14 26 27 31 30</span>
<span class="go"> 9 1 11 12 16 15 27 28 32 31</span>
<span class="go"> 10 1 17 18 22 21 33 34 38 37</span>
<span class="go"> ...]</span>
<span class="go">Element IDs</span>
<span class="gp">>>> </span><span class="n">section</span> <span class="o">=</span> <span class="n">deck</span><span class="o">.</span><span class="n">element_solid_sections</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="gp">>>> </span><span class="n">section</span><span class="o">.</span><span class="n">eid</span>
<span class="go">array([ 1, 2, 3, ..., 814, 815, 816], dtype=int32)</span>
<span class="go">Node IDs of the elements</span>
<span class="gp">>>></span>
<span class="go">array([ 1, 2, 6, ..., 1256, 1267, 1266], dtype=int32)</span>
</pre></div>
</div>
<p>The elements are stored as a single contiguous array for efficiency and can be
split up via:</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="gp">>>> </span><span class="n">elements</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">section</span><span class="o">.</span><span class="n">node_ids</span><span class="p">,</span> <span class="n">section</span><span class="o">.</span><span class="n">node_id_offsets</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">])</span>
<span class="go">[array([ 1, 2, 6, 5, 17, 18, 22, 21], dtype=int32),</span>
<span class="go"> array([ 2, 3, 7, 6, 18, 19, 23, 22], dtype=int32),</span>
<span class="go">...</span>
<span class="go">]</span>
</pre></div>
</div>
<p>If you have <code class="docutils literal notranslate"><span class="pre">pyvista</span></code> installed or installed the library with <code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">lsdyna-mesh-reader[pyvista]</span></code>, you can convert the mesh to a single unstructured
grid:</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">grid</span> <span class="o">=</span> <span class="n">deck</span><span class="o">.</span><span class="n">to_grid</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">grid</span>
<span class="go">UnstructuredGrid (0x70d5d723bc40)</span>
<span class="go"> N Cells: 916</span>
<span class="go"> N Points: 1281</span>
<span class="go"> X Bounds: -2.000e+01, 2.220e-15</span>
<span class="go"> Y Bounds: -1.000e+01, 4.000e+00</span>
<span class="go"> Z Bounds: -2.000e+01, 4.441e-15</span>
<span class="go"> N Arrays: 2</span>
</pre></div>
</div>
<p>This lets you plot, save, or perform other operations on the mesh via
PyVista. For example, you could plot the resulting mesh. Here’s a full example using the <a class="reference external" href="https://www.dynaexamples.com/implicit/yaris-static-suspension-system-loading">Yaris Static Suspension System Loading Examplew</a>.</p>
<div class="highlight-py notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">filename</span> <span class="o">=</span> <span class="s2">"YarisD_V2g_shock_abs_load_01.k"</span>
<span class="gp">>>> </span><span class="n">deck</span> <span class="o">=</span> <span class="n">Deck</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">grid</span> <span class="o">=</span> <span class="n">deck</span><span class="o">.</span><span class="n">to_grid</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">grid</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">color</span><span class="o">=</span><span class="s2">"w"</span><span class="p">,</span> <span class="n">smooth_shading</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">show_edges</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</pre></div>
</div>
<p><img alt="Yaris Static Suspension Mesh" src="https://github.com/akaszynski/lsdyna-mesh-reader/raw/main/docs/source/images/yaris-mesh.png" /></p>
</section>
<section id="caveats-and-limitations">
<h3>Caveats and Limitations<a class="headerlink" href="#caveats-and-limitations" title="Link to this heading">#</a></h3>
<p>As of now, limited testing has been performed on this library and you may find
that it fails to load complex or simple keyword decks.</p>
<p>Additionally, this reader only supports the following keywords:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">*NODE</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">*ELEMENT_SHELL</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">*ELEMENT_SOLID</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">*ELEMENT_TSHELL</span></code> (note: sections encoded as solid sections)</p></li>
</ul>
<p>The VTK UnstructuredGrid contains only the linear element conversion of the
underlying LS-DYNA elements, and only supports <code class="docutils literal notranslate"><span class="pre">VTK_QUAD</span></code>, <code class="docutils literal notranslate"><span class="pre">VTK_TRIANGLE</span></code>,
<code class="docutils literal notranslate"><span class="pre">VTK_TETRA</span></code>, <code class="docutils literal notranslate"><span class="pre">VTK_WEDGE</span></code>, and <code class="docutils literal notranslate"><span class="pre">VTK_HEXAHEDRAL</span></code>.</p>
</section>
</section>
<section id="issues-and-contributing">
<h2>Issues and Contributing<a class="headerlink" href="#issues-and-contributing" title="Link to this heading">#</a></h2>
<p>Feel free to open an <a class="reference external" href="https://github.com/akaszynski/lsdyna-mesh-reader/issues">Issue</a> in this repository with any features you’d like me to add or bugs you need fixed.</p>
<p>If you’d like to contribute, please see <a class="reference external" href="https://github.com/akaszynski/lsdyna-mesh-reader/blob/main/CONTRIBUTING.md">CONTRIBUTING.md</a>.</p>
</section>
<section id="license">
<h2>License<a class="headerlink" href="#license" title="Link to this heading">#</a></h2>
<p>Source and content is under the MIT License, except for the LS-DYNA artifacts,
which retain their original license from LS-DYNA and Ansys.</p>
<p>Note that the example files used here were downloaded from <a class="reference external" href="https://www.dynaexamples.com/">LS-DYNA
Examples</a> and have the following usage license
as noted on the website:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>The input files and several class notes are available for download. The
download is free of charge, a login is not required. All examples are
presented with a brief description. You may find an example by checking a
specific class or by using the search functionality of the site.
The content is prepared for educational purposes. Hence, material
properties and other parameters might be non-physic for simplification.
</pre></div>
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