Dear lammps Users,
I am trying impart a very small sudden displacement to a group of particles. I am trying to use fix move to give a sudden velocity v at t = t1 to t=t2 , so as get a displacement v*(t2-t1). However I am not able to figure out, how to mention t1 and t2 elegantly with fix move.
Or is there any other way of doing this ?
Please help.
Assembly of particles is as shown in the figure, pink particles (say group ID 2) would be displaced suddenly upwards leading to a dynamic wave being generated to grey particles.
Kind regards
Prashant Gupta
Post Grad
University of Edinburgh 
Dear lammps Users,
I am trying impart a very small sudden displacement to a group of
particles. I am trying to use fix move to give a sudden velocity v at t =
t1 to t=t2 , so as get a displacement v*(t2-t1). However I am not able to
figure out, how to mention t1 and t2 elegantly with fix move.
Or is there any other way of doing this ?
if you want to impart a specific velocity, you can use the velocity
command to add(!) such a velocity to the selected particles.
if you want a sudden displacement for just one step, you can just define an
atom style variable to hold that coordinate plus the displacement and use
the set command.
axel.
Axel,
I suppose there is also the displace_atoms command?
Oleg
Axel Kohlmeyer [email protected] 16 апреля 2014 г. 19:52:15 написал:
Axel,
I suppose there is also the displace_atoms command?
yes. certainly. looks like LAMMPS is becoming the "perl of MD" in that
there are many ways to do the same thing.