[lammps-users] fix Langevin and zero mass


We know the inertial effects can be disregarded when doing Brownian dynamics simulation. ant then I want to ask whether I can set particles’ mass zero if I use fix langevin command in LAMMPS. if not, what’s the difference between MD with langevin thermostatting and Brownian dynamics in time scale and length scale.

Thanks in advance.

You can't set the mass of a particle to zero.

See the doc page on fix langevin and the fix_langevin.cpp file
for details of what it's doing.