fbfd916c69
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13836 f3b2605a-c512-4ea7-a41b-209d697bcdaa
82 lines
3.1 KiB
HTML
82 lines
3.1 KiB
HTML
<HTML>
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<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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<H3>fix smd/move_tri_surf command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>fix ID group-ID smd/move_tri_surf keyword
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</PRE>
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<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
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<LI>smd/move_tri_surf keyword = style name of this fix command
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<LI>keyword = <I>*LINEAR</I> or <I>*WIGGLE</I> or <I>*ROTATE</I>
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<PRE> <I>*LINEAR</I> 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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<I>*WIGGLE</I> 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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<I>*ROTATE</I> 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>
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</UL>
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<P><B>Examples:</B>
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</P>
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<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>
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<P><B>Description:</B>
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</P>
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<P>This fix applies only to rigid surfaces read from .STL files via fix <A HREF = "fix_smd_wall_surface.html">smd/wall_surface</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.
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</P>
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<P>The <I>*LINEAR</I> 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).
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</P>
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<P>The <I>*WIGGLE</I> 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.
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</P>
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<P>The <I>*ROTATE</I> 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.
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</P>
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<P>See <A HREF = "USER/smd/SMD_LAMMPS_userguide.pdf">this PDF guide</A> to using Smooth Mach Dynamics in LAMMPS.
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</P>
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<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
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</P>
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<P>Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.
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</P>
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<P><B>Restrictions:</B>
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</P>
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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 HREF = "Section_start.html#start_3">Making LAMMPS</A>
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section for more info.
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "compute_smd_triangle_mesh_vertices.html">smd/triangle_mesh_vertices</A>, <A HREF = "fix_smd_wall_surface.html">smd/wall_surface</A>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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