gran tangential history/lubricated¶

Syntax¶

tangential history/lubricated

LIGGGHTS vs. LAMMPS Info:

This part of pair gran and fix wall/gran is not available in LAMMPS.

Description¶

In this granular model, the tangential contact force is calculated in the same manner as in tangential history. This model is to be used in conjunction with the normal model hertz/lubricated, and will throw errors without it.

The coefficient of friction is selected from the dry or the lubricated value, depending on the minimum approach distance between particle surfaces.

images/gran_tangential_history_lubricated_1.png

To define the material properties, it is mandatory to use multiple fix property/global commands:

fix id all property/global coefficientFriction peratomtypepair n_atomtypes value_11 value_12 .. value_21 value_22 .. .
    (value_ij=value for the (static) dry coefficient of friction between atom type i and j; n_atomtypes is the number of atom types you want to use in your simulation)
fix id all property/global coefficientFrictionLubricated peratomtypepair n_atomtypes value_11 value_12 .. value_21 value_22 .. .
    (value_ij=value for the (static) lubricated coefficient of friction between atom type i and j; n_atomtypes is the number of atom types you want to use in your simulation)