I am new to Lammps and I am working on a mesoscale simulation using granular and rigid packages. I use nonrigid atoms to model granular media (GM) and a rigid body, made out of small atoms, to represent an intruder of non-trivial geometry with the intention of manipulating the intruder within GM.
My question is about the contact relation between rigid and nonrigid bodies. The manual gives detailed information about the types of contact forces between individual atoms where I use atom_style sphere and gran/hertz/history as the pair_style. Does LAMMPS apply the same pair_style to solve for the interaction between the rigid body (of small particles) and the neighboring nonrigid granular particles? Also, does LAMMPS consider the full details of an intricate shaped rigid body when it is in contact with many neighboring nonrigid granular particles during calculation of the penetration depth and the resulting forces? Or does LAMMPS reduce the complexity of the rigid body geometry for such calculation purposes?