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fix viscous command

Syntax:

fix ID group-ID viscous coeff 

Examples:

fix 1 flow viscous 0.1 

Description:

Add a viscous damping force to atoms in the group that is proportional to the velocity of the atom. This is useful for draining the kinetic energy from the system in a controlled fasion. The damping force F is given by F = - coeff * velocity. The larger the coefficient, the faster the kinetic energy is reduced.

Restrictions: none

Related commands: none

Default: none