I am Ashish Orpe, a research scientist working at the National Chemical Laboratory, India. I am using lammps to carry out simulations of granular particles while draining down a silo. I use gran/hooke/history as the pair_style.
I have following question
Is it possible to have a scenario with part of particles with a certain friction coefficient (xmu) and the remaining with other friction coefficient (xmu)?
As per my information, pair_style hybrid option used as following is not possible
Note, everything is same in the above commands except the xmu value (5th argument), so effectively, it is not really a hybrid pair_style
Further, if using the pair_style hybrid command, the arguments are needed to be given with pair_coeff for a specific set of particles which is also not allowed within granular style
For granular styles tFor granular styles there are no additional coefficients to set for
each pair of atom types via the “pair_coeff”_pair_coeff.html command.
All settings are global and are made via the pair_style command.
However you must still use the “pair_coeff”_pair_coeff.html for all
pairs of granular atom types. For example the command
pair_coeff * * :pre
should be used if all atoms in the simulation interact via a granular
potential (i.e. one of the pair styles above is used). If a granular
potential is used as a sub-style of “pair_style
hybrid”_pair_hybrid.html, then specific atom types can be used in the
pair_coeff command to determine which atoms interact via a granular
potential.
So I think you can do what you are asking w/ 2 different pair style commands