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Re: [lammps-users] Inelastic collisions in atom_style hybrid sphere dipole
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Re: [lammps-users] Inelastic collisions in atom_style hybrid sphere dipole

From: Steve Plimpton <sjplimp@...24...>
Date: Fri, 23 Jun 2017 09:01:04 -0600

It sounds like you are saying you want to replace two touching
small spheres (just collided) with one large sphere.  To do that
you'd have to write new code in LAMMPS that replaced 2 particles with
one large particle.  If the large particle is a sphere, it takes up more
volume than the original two small particles.  So there wouldn't be
room for it in a dense granular packing.

So to me, your model does not make much sense.  Regardless, to
implement it, you would have to do some careful new coding within


On Fri, Jun 23, 2017 at 6:32 AM, Ashwin Padmanabhan <ashwinpadmanabhan95@...24...> wrote:
Respected Lammps-Users,

I have a system of granular atoms to which i have set a dipole moment and mass. The atoms are attracted towards one another (Due to the dipole moments) and would collide.

My query is as follows:

- How would I assign an 'event' which is defined as the collision of two atoms such that i could note the time and coordinates of atoms during the collision.

- I would want the two atoms that collided to be treated as a single granular sphere   following the collision with the mass and dipole moments of the new sphere equal to the summation of the masses and dipole moments of smaller colliding spheres.

Help is deeply appreciated. And I would be grateful.


Ashwin Padmanabhan
IIT Bombay, India

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