Particle size in LIGGGHTS/LAMMPS

Submitted by tribeniroy on Wed, 05/10/2017 - 19:47

LAMMPS are for particle size in atomic range (angstrom). What is the minimum size of particle that can be inserted in LIGGGHTS? Most of the tutorials takes millimetre sized particles. Can we take nano to sub micron size of particles in LIGGGHTS?

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mschramm | Wed, 05/10/2017 - 21:09

You will need to switch units.
If you would like to use particles with nano particles, you can use the command
units nano
Your input file will then be looking for the following for all other units.
mass = attograms
distance = nanometers
time = nanoseconds
energy = attogram-nanometer^2/nanosecond^2
velocity = nanometers/nanosecond
force = attogram-nanometer/nanosecond^2
torque = attogram-nanometer^2/nanosecond^2
temperature = Kelvin
pressure = attogram/(nanometer-nanosecond^2)
dynamic viscosity = attogram/(nanometer-nanosecond)
charge = multiple of electron charge (+1.0 is a proton)
dipole = charge-nanometer
electric field = volt/nanometer
density = attograms/nanometer^dim
http://www.cfdem.com/media/DEM/docu/units.html