Hi friends
I am working with a multi steps molecular dynamic simulation. i.e, firstly, making the simulation box and the defining the size and the how many particles and what type of particle are there… secondly, fix the pressure of the simulation box for a desired value by shrinking or expanding. Thirdly, i am going to do some stress analysis by giving a drag force on one particle.
My question is, why it is actually ok to change parameters like gamma_n (damping coefficient in the normal direction) and viscous but not parameters such as kn (elastic constant for normal particle repulsion) and mu(Friction coefficient) withing the simulation steps?
Also I would like to know about the constant “gamma_n”, what does this physically represent?
Thanks a lot.
mwn.
Hi dear lammmps users,
I am still waiting to know an answer for my question… If you need more information, I would like to know what are they.
Thanks
Niranjan
Hi dear lammmps users,
I am still waiting to know an answer for my question... If you need more
information, I would like to know what are they.
if you don't get an answer, then there is likely a reason:
- nobody knows the answer
- nobody understands the question
- nobody cares
- your question is ill posed
- people think that you should figure out the answer for yourself
(e.g. from the references in the documentation or the mailing list
archives or a web search)
- or a combination of those.
complaining that you don't get an answer doesn't improve the question
and at best gets you a non-answer like this one.
axel.
I don’t recall you email. You can change parameters
of a simulation on the fly, either between a series
of short runs, using normal commands, or gradually
using fix adapt. If something you want to change
isn’t currently handled by fix adapt, it is often not
hard to add it.
Whether it is a good idea to change params is up
to you and your model. Gamma_n for granular materials
is typically a material property. So unless your material
is changing over time, neither would gamma_n.
Steve