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<title>compute smd/tlsph/defgrad command — LAMMPS documentation</title>
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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_commands.html">3. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_accelerate.html">5. Accelerating LAMMPS performance</a></li>
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<li>compute smd/tlsph/defgrad command</li>
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<div class="section" id="compute-smd-tlsph-defgrad-command">
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<span id="index-0"></span><h1>compute smd/tlsph/defgrad command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">defgrad</span>
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</pre></div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
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<li>smd/tlsph/defgrad = style name of this compute command</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">smd</span><span class="o">/</span><span class="n">tlsph</span><span class="o">/</span><span class="n">defgrad</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Define a computation that calculates the deformation gradient. It is
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only meaningful for particles which interact according to the
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Total-Lagrangian SPH pair style.</p>
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<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to use Smooth
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Mach Dynamics in LAMMPS.</p>
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<p><strong>Output info:</strong></p>
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<p>This compute outputss a per-particle vector of vectors (tensors),
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which can be accessed by any command that uses per-particle values
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from a compute as input. See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">How-to discussions, section 6.15</span></a> for an overview of LAMMPS output
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options.</p>
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<p>The per-particle vector values will be given dimensionless. See
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<a class="reference internal" href="units.html"><span class="doc">units</span></a>. The per-particle vector has 10 entries. The first
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nine entries correspond to the xx, xy, xz, yx, yy, yz, zx, zy, zz
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components of the asymmetric deformation gradient tensor. The tenth
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entry is the determinant of the deformation gradient.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<p>This compute is part of the USER-SMD package. It is only enabled if
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LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info. TThis
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compute can only be used for particles which interact via the total
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Lagrangian SPH pair style.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="compute_smd_hourglass_error.html"><span class="doc">smd/hourglass/error</span></a></p>
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<p><strong>Default:</strong> none</p>
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