[lammps-users] Using lammps for inelastic collisions and cohesion

Hi,
I am trying to model the particles that are half a millimetre in diameter size and their in-elastic collisions and cohesion properties. Can anyone please help me on how to do this using LAMMPS. Does LAMMPS have any modules already written for these properties.

Thanks!

Vinodh

Hi,
I am trying to model the particles that are half a millimetre in diameter
size and their in-elastic collisions and cohesion properties. Can anyone
please help me on how to do this using LAMMPS. Does LAMMPS have any modules
already written for these properties.

every module programmed into lammps, is described in the documentation.
please help yourself.

in general, the best strategy is to first find out what kind of physical
model is adequate for what you want to do, then what kind of interaction
potentials would represent that and finally, if those exist in lammps.
note the other way around.

cheers,
    axel.

There are granular potentials in the code, which can model
granular particles of any size (typically in dimensionless LJ units).
These potentials model inelastic (frictional) collisions. Cohesion
means attraction, which is not part of typical granular interactions.
You might be able to superpose that term (e.g. pair hybrid). You
might also check the LIGGGHTS WWW site which has extended
the granular models in LAMMPS - maybe they have a cohesive
potential.

Steve

Dear Lammps Users,

I am trying to add some new fix styles to LAMMPS and I have two files fix_c.cpp and fix_c.h files. I added these two files to LAMMPS src directory. I am using very old version of LAMMPS (22 Jun 2007). The Section_modify.txt file of this version says I need to modify the Style_user.h file for LAMMPS to pick up the new fix styles.

The example given in that document is for adding new pairStyle. I followed the same instructions for Fix but couldn’t succeed. Any input on this will be of great help for me.
The two lines in added in the Style_user.h files are

#include fix_c.h
FixStyle(c, FixC)
c - is the fix style and FixC is the class name in fix_c.cpp

Thanks!
Vinodh

Dear Lammps Users,
I am trying to add some new fix styles to LAMMPS and I have two files
fix_c.cpp and fix_c.h files. I added these two files to LAMMPS src
directory. I am using very old version of LAMMPS (22 Jun 2007). The
Section_modify.txt file of this version says I need to modify the
Style_user.h file for LAMMPS to pick up the new fix styles.
The example given in that document is for adding new pairStyle. I followed
the same instructions for Fix but couldn't succeed. Any input on this will
be of great help for me.

nobody will be interested to help you with an obsolete version of lammps.

you need to either update to the current version or figure it out by yourself.

axel.

Not to mention that all of this is easier in
the current version of LAMMPS. And
that your financial health, relationships, and general
outlook on life will all be better/happier
with the newest version.

Steve