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<li>fix smd/move_tri_surf command</li>
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<div class="section" id="fix-smd-move-tri-surf-command">
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<span id="index-0"></span><h1>fix smd/move_tri_surf command<a class="headerlink" href="#fix-smd-move-tri-surf-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>fix ID group-ID smd/move_tri_surf keyword
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</pre></div>
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</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"><em>fix</em></a> command</li>
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<li>smd/move_tri_surf keyword = style name of this fix command</li>
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<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>
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</ul>
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<div class="highlight-python"><div class="highlight"><pre>**LINEAR* args = Vx Vy Vz
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Vx,Vy,Vz = components of velocity vector (velocity units), any component can be specified as NULL
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**WIGGLE* args = Vx Vy Vz max_travel
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vx,vy,vz = components of velocity vector (velocity units), any component can be specified as NULL
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max_travel = wiggle amplitude
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**ROTATE* args = Px Py Pz Rx Ry Rz period
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Px,Py,Pz = origin point of axis of rotation (distance units)
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Rx,Ry,Rz = axis of rotation vector
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period = period of rotation (time units)
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</pre></div>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>fix 1 tool smd/move_tri_surf *LINEAR 20 20 10
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fix 2 tool smd/move_tri_surf *WIGGLE 20 20 10
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fix 2 tool smd/move_tri_surf *ROTATE 0 0 0 5 2 1
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</pre></div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>This fix applies only to rigid surfaces read from .STL files via fix <a class="reference internal" href="fix_smd_wall_surface.html"><em>smd/wall_surface</em></a> .
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It updates position and velocity for the particles in the group each timestep without regard to forces on the particles.
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The rigid surfaces can thus be moved along simple trajectories during the simulation.</p>
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<p>The <a href="#id19"><span class="problematic" id="id20">**</span></a>LINEAR* style moves particles with the specified constant velocity
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vector V = (Vx,Vy,Vz). This style also sets the velocity of each particle
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to V = (Vx,Vy,Vz).</p>
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<p>The <a href="#id21"><span class="problematic" id="id22">**</span></a>WIGGLE* style moves particles in an oscillatory fashion.
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Particles are moved along (vx, vy, vz) with constant velocity until a
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displacement of max_travel is reached. Then, the velocity vector is
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reversed. This process is repeated.</p>
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<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
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goes through a point P = (Px,Py,Pz). The period of the rotation is also
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specified. This style also sets the velocity of each particle to (omega cross
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Rperp) where omega is its angular velocity around the rotation axis and
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Rperp is a perpendicular vector from the rotation axis to the particle.</p>
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<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>
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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<a class="headerlink" href="#restart-fix-modify-output-run-start-stop-minimize-info" title="Permalink to this headline">¶</a></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<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></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>Making LAMMPS</span></a>
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section for more info.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="compute_smd_triangle_mesh_vertices.html"><em>smd/triangle_mesh_vertices</em></a>, <a class="reference internal" href="fix_smd_wall_surface.html"><em>smd/wall_surface</em></a></p>
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<p><strong>Default:</strong> none</p>
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