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
|
||
|
|
|
||
|
|
:link(lws,http://lammps.sandia.gov)
|
||
|
|
:link(ld,Manual.html)
|
||
|
|
:link(lc,Section_commands.html#comm)
|
||
|
|
|
||
|
|
:line
|
||
|
|
|
||
|
|
fix smd/move_tri_surf command :h3
|
||
|
|
|
||
|
|
[Syntax:]
|
||
|
|
|
||
|
|
fix ID group-ID smd/move_tri_surf keyword :pre
|
||
|
|
|
||
|
|
ID, group-ID are documented in "fix"_fix.html command :ulb,l
|
||
|
|
smd/move_tri_surf keyword = style name of this fix command :l
|
||
|
|
keyword = {*LINEAR} or {*WIGGLE} or {*ROTATE} :l
|
||
|
|
|
||
|
|
{*LINEAR} args = Vx Vy Vz
|
||
|
|
Vx,Vy,Vz = components of velocity vector (velocity units), any component can be specified as NULL
|
||
|
|
{*WIGGLE} args = Vx Vy Vz max_travel
|
||
|
|
vx,vy,vz = components of velocity vector (velocity units), any component can be specified as NULL
|
||
|
|
max_travel = wiggle amplitude
|
||
|
|
{*ROTATE} args = Px Py Pz Rx Ry Rz period
|
||
|
|
Px,Py,Pz = origin point of axis of rotation (distance units)
|
||
|
|
Rx,Ry,Rz = axis of rotation vector
|
||
|
|
period = period of rotation (time units) :pre
|
||
|
|
|
||
|
|
:ule
|
||
|
|
|
||
|
|
[Examples:]
|
||
|
|
|
||
|
|
fix 1 tool smd/move_tri_surf *LINEAR 20 20 10
|
||
|
|
fix 2 tool smd/move_tri_surf *WIGGLE 20 20 10
|
||
|
|
fix 2 tool smd/move_tri_surf *ROTATE 0 0 0 5 2 1 :pre
|
||
|
|
|
||
|
|
[Description:]
|
||
|
|
|
||
|
|
This fix applies only to rigid surfaces read from .STL files via fix "smd/wall_surface"_fix_smd_wall_surface.html .
|
||
|
|
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.
|
||
|
|
|
||
|
|
The {*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).
|
||
|
|
|
||
|
|
The {*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.
|
||
|
|
|
||
|
|
The {*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.
|
||
|
|
|
||
|
|
See "this PDF guide"_USER/smd/SMD_LAMMPS_userguide.pdf to using Smooth Mach Dynamics in LAMMPS.
|
||
|
|
|
||
|
|
[Restart, fix_modify, output, run start/stop, minimize info:]
|
||
|
|
|
||
|
|
Currently, no part of USER-SMD supports restarting nor minimization. This fix has no outputs.
|
||
|
|
|
||
|
|
[Restrictions:]
|
||
|
|
|
||
|
|
This fix is part of the USER-SMD package. It is only enabled if
|
||
|
|
LAMMPS was built with that package. See the "Making LAMMPS"_Section_start.html#start_3
|
||
|
|
section for more info.
|
||
|
|
|
||
|
|
|
||
|
|
[Related commands:]
|
||
|
|
|
||
|
|
"smd/triangle_mesh_vertices"_compute_smd_triangle_mesh_vertices.html, "smd/wall_surface"_fix_smd_wall_surface.html
|
||
|
|
|
||
|
|
[Default:] none
|