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<div class="section" id="fix-smd-move-tri-surf-command">
<span id="index-0"></span><h1>fix smd/move_tri_surf command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<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">move_tri_surf</span> <span class="n">keyword</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</li>
<li>smd/move_tri_surf keyword = style name of this fix command</li>
<li>keyword = <a href="#id1"><span class="problematic" id="id2">**</span></a>LINEAR* or <a href="#id3"><span class="problematic" id="id4">**</span></a>WIGGLE* or <a href="#id5"><span class="problematic" id="id6">**</span></a>ROTATE*</li>
</ul>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="o">**</span><span class="n">LINEAR</span><span class="o">*</span> <span class="n">args</span> <span class="o">=</span> <span class="n">Vx</span> <span class="n">Vy</span> <span class="n">Vz</span>
<span class="n">Vx</span><span class="p">,</span><span class="n">Vy</span><span class="p">,</span><span class="n">Vz</span> <span class="o">=</span> <span class="n">components</span> <span class="n">of</span> <span class="n">velocity</span> <span class="n">vector</span> <span class="p">(</span><span class="n">velocity</span> <span class="n">units</span><span class="p">),</span> <span class="nb">any</span> <span class="n">component</span> <span class="n">can</span> <span class="n">be</span> <span class="n">specified</span> <span class="k">as</span> <span class="n">NULL</span>
<span class="o">**</span><span class="n">WIGGLE</span><span class="o">*</span> <span class="n">args</span> <span class="o">=</span> <span class="n">Vx</span> <span class="n">Vy</span> <span class="n">Vz</span> <span class="n">max_travel</span>
<span class="n">vx</span><span class="p">,</span><span class="n">vy</span><span class="p">,</span><span class="n">vz</span> <span class="o">=</span> <span class="n">components</span> <span class="n">of</span> <span class="n">velocity</span> <span class="n">vector</span> <span class="p">(</span><span class="n">velocity</span> <span class="n">units</span><span class="p">),</span> <span class="nb">any</span> <span class="n">component</span> <span class="n">can</span> <span class="n">be</span> <span class="n">specified</span> <span class="k">as</span> <span class="n">NULL</span>
<span class="n">max_travel</span> <span class="o">=</span> <span class="n">wiggle</span> <span class="n">amplitude</span>
<span class="o">**</span><span class="n">ROTATE</span><span class="o">*</span> <span class="n">args</span> <span class="o">=</span> <span class="n">Px</span> <span class="n">Py</span> <span class="n">Pz</span> <span class="n">Rx</span> <span class="n">Ry</span> <span class="n">Rz</span> <span class="n">period</span>
<span class="n">Px</span><span class="p">,</span><span class="n">Py</span><span class="p">,</span><span class="n">Pz</span> <span class="o">=</span> <span class="n">origin</span> <span class="n">point</span> <span class="n">of</span> <span class="n">axis</span> <span class="n">of</span> <span class="n">rotation</span> <span class="p">(</span><span class="n">distance</span> <span class="n">units</span><span class="p">)</span>
<span class="n">Rx</span><span class="p">,</span><span class="n">Ry</span><span class="p">,</span><span class="n">Rz</span> <span class="o">=</span> <span class="n">axis</span> <span class="n">of</span> <span class="n">rotation</span> <span class="n">vector</span>
<span class="n">period</span> <span class="o">=</span> <span class="n">period</span> <span class="n">of</span> <span class="n">rotation</span> <span class="p">(</span><span class="n">time</span> <span class="n">units</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="mi">1</span> <span class="n">tool</span> <span class="n">smd</span><span class="o">/</span><span class="n">move_tri_surf</span> <span class="o">*</span><span class="n">LINEAR</span> <span class="mi">20</span> <span class="mi">20</span> <span class="mi">10</span>
<span class="n">fix</span> <span class="mi">2</span> <span class="n">tool</span> <span class="n">smd</span><span class="o">/</span><span class="n">move_tri_surf</span> <span class="o">*</span><span class="n">WIGGLE</span> <span class="mi">20</span> <span class="mi">20</span> <span class="mi">10</span>
<span class="n">fix</span> <span class="mi">2</span> <span class="n">tool</span> <span class="n">smd</span><span class="o">/</span><span class="n">move_tri_surf</span> <span class="o">*</span><span class="n">ROTATE</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">5</span> <span class="mi">2</span> <span class="mi">1</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>This fix applies only to rigid surfaces read from .STL files via fix <a class="reference internal" href="fix_smd_wall_surface.html"><span class="doc">smd/wall_surface</span></a> .
It updates position and velocity for the particles in the group each timestep without regard to forces on the particles.
The rigid surfaces can thus be moved along simple trajectories during the simulation.</p>
<p>The <a href="#id19"><span class="problematic" id="id20">**</span></a>LINEAR* style moves particles with the specified constant velocity
vector V = (Vx,Vy,Vz). This style also sets the velocity of each particle
to V = (Vx,Vy,Vz).</p>
<p>The <a href="#id21"><span class="problematic" id="id22">**</span></a>WIGGLE* style moves particles in an oscillatory fashion.
Particles are moved along (vx, vy, vz) with constant velocity until a
displacement of max_travel is reached. Then, the velocity vector is
reversed. This process is repeated.</p>
<p>The <a href="#id23"><span class="problematic" id="id24">**</span></a>ROTATE* style rotates particles around a rotation axis R = (Rx,Ry,Rz) that
goes through a point P = (Px,Py,Pz). The period of the rotation is also
specified. This style also sets the velocity of each particle to (omega cross
Rperp) where omega is its angular velocity around the rotation axis and
Rperp is a perpendicular vector from the rotation axis to the particle.</p>
<p>See <a class="reference external" href="USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</a> to using Smooth Mach Dynamics in LAMMPS.</p>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info</h2>
<p>Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This fix is part of the USER-SMD package. It is only enabled if
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.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<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_wall_surface.html"><span class="doc">smd/wall_surface</span></a></p>
<p><strong>Default:</strong> none</p>
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