forked from lijiext/lammps
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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fix smd/move_tri_surf command :h3
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[Syntax:]
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fix ID group-ID smd/move_tri_surf keyword :pre
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ID, group-ID are documented in "fix"_fix.html command :ulb,l
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smd/move_tri_surf keyword = style name of this fix command :l
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keyword = {*LINEAR} or {*WIGGLE} or {*ROTATE} :l
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{*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) :pre
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:ule
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[Examples:]
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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 :pre
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[Description:]
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This fix applies only to rigid surfaces read from .STL files via fix "smd/wall_surface"_fix_smd_wall_surface.html .
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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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The {*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).
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The {*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.
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The {*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.
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See "this PDF guide"_USER/smd/SMD_LAMMPS_userguide.pdf to using Smooth Mach Dynamics in LAMMPS.
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[Restart, fix_modify, output, run start/stop, minimize info:]
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Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.
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[Restrictions:]
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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 "Making LAMMPS"_Section_start.html#start_3
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section for more info.
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[Related commands:]
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"smd/triangle_mesh_vertices"_compute_smd_triangle_mesh_vertices.html, "smd/wall_surface"_fix_smd_wall_surface.html
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[Default:] none
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