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<div class="section" id="fix-smd-wall-surface-command">
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<span id="index-0"></span><h1>fix smd/wall_surface 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">fix</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">wall_surface</span> <span class="n">arg</span> <span class="nb">type</span> <span class="n">mol</span><span class="o">-</span><span class="n">ID</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="fix.html"><span class="doc">fix</span></a> command</li>
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<li>smd/wall_surface = style name of this fix command</li>
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<li>arg = <em>file</em></li>
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</ul>
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<pre class="literal-block">
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<em>file</em> = file name of a triangular mesh in stl format
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</pre>
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<ul class="simple">
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<li>type = particle type to be given to the new particles created by this fix</li>
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<li>mol-ID = molecule-ID to be given to the new particles created by this fix (must be >= 65535)</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">fix</span> <span class="n">stl_surf</span> <span class="nb">all</span> <span class="n">smd</span><span class="o">/</span><span class="n">wall_surface</span> <span class="n">tool</span><span class="o">.</span><span class="n">stl</span> <span class="mi">2</span> <span class="mi">65535</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>This fix creates reads a traingulated surface from a file in .STL format.
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For each triangle, a new particle is created which stores the barycenter of the triangle and the vertex positions.
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The radius of the new particle is that of the minimum circle which encompasses the triangle vertices.</p>
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<p>The triangulated surface can be used as a complex rigid wall via the <a class="reference internal" href="pair_smd_triangulated_surface.html"><span class="doc">smd/tri_surface</span></a> pair style.
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It is possible to move the triangulated surface via the <a class="reference internal" href="fix_smd_move_triangulated_surface.html"><span class="doc">smd/move_tri_surf</span></a> fix style.</p>
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<p>Immediately after a .STL file has been read, the simulation needs to be run for 0 timesteps in order to properly register the new particles
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in the system. See the “funnel_flow” example in the USER-SMD examples directory.</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 Mach Dynamics in LAMMPS.</p>
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</div>
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<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
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<h2>Restart, fix_modify, output, run start/stop, minimize info</h2>
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<p>Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.</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 fix 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>
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section for more info. The molecule ID given to the particles created by this fix have to be equal to or larger than 65535.</p>
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<p>Within each .STL file, only a single triangulated object must be present, even though the STL format allows for the possibility of multiple objects in one file.</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_triangle_mesh_vertices.html"><span class="doc">smd/triangle_mesh_vertices</span></a>, <a class="reference internal" href="fix_smd_move_triangulated_surface.html"><span class="doc">smd/move_tri_surf</span></a>, <a class="reference internal" href="pair_smd_triangulated_surface.html"><span class="doc">smd/tri_surface</span></a></p>
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<p><strong>Default:</strong> none</p>
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