Please post Qs to the LAMMPS mail
list where many people can answer.
Steve
Please post Qs to the LAMMPS mail
list where many people can answer.
Steve
two comments,
if you want to reduce the amount of output, use a custom dump style
and leave out everything you don't need.
if that is not enough, you can always write your own custom dump style
with the format that is convenient to you,
use use the library interface to write a program that can directly
access the raw data.
if you worry about disk space, you can use binary output or
compression with gzip.
we are also about to release a contributed dump style that uses an
hdf5 based file format that can be efficiently imported by many
programs.
making dump output like thermo output would be (please excuse the pun)
dumb and would exchange extremely wide lines for minimal gain in
space. the standard dump file format is easy to parse, there are
parsers for in in the Pizza.py companion package to LAMMPS, for
example.
axel.
Hi, I am trying to simulate an intruder in a granular medium, here an intruder is just an atom with larger diameter compared to the media. Now, I want the intruder to have an initial force only in that initial time and let the velocity of the intruder keeps getting slower as times passed for the reason that the kinetic energy is transferred to the granular media. Is there any fix for this?
Jayson
Jayson,
There’s no “fix” for any of this, you’re talking about an entire input script. No one is likely to furnish one for you. No one’s paid and we’re not co-authors. What you’re describing is quite easy to do once you’ve learned some of the basic capabilities, and simply going through some examples included in lammps, e.g. pour, would be very informative for you. As a side note, if you ask more focused questions you’ll probably get better answers.
Hi, I am trying to simulate an intruder in a granular medium, here an
intruder is just an atom with larger diameter compared to the media. Now, I
want the intruder to have an initial force only in that initial time and
let the velocity of the intruder keeps getting slower as times passed for
the reason that the kinetic energy is transferred to the granular media. Is
there any fix for this?
first off. this is a completely new question with no relation to your
previous posts.
common mailing list courtesy is to start a new discussion with a new
subject line. this way people can more easily assess from the subject line
whether this is an e-mail that they are interested to read or not.
second, you seem to be a bit confused about the physics happening in your
simulation. from what you describe, you don't want to set the force, but
the velocity of your "intruder" and the dissipation of energy should happen
automatically from the interactions of your "intruder" with the stationary
particles. of course, you can "imprint" a particular motion of a particle
via fix move, but then you wouldn't do science but a computer animation. 
thus please follow eric's advice and study the pour example and the
documentation for fix pour.
axel.