Coagulation of naked grains (SIMNAKED)
V. Ossenkopf,
MPG AG ``Dust in Star-Forming Regions'' Jena
SIMNAKED is a program for the simulation of the coagulation
of dust grains without ice mantles. It solves the coagulation
equation by an Eulerian integration in conditions typical for
the interior of a cold molecular cloud core. This means that the physical
effects of thermal and turbulent motions, relative grain velocities
due to accidential grain asymmetries, grain charges and a finite
critical velocity for grain sticking are implemented.
The dust particles are
characterized by two parameters - the compact volume and an internal
density parameter. The evolution of the dust distribution over these
two parameters is followed at any fixed point in the cloud. No dust
transport is incorporated. The resulting dust distributions
can be stored after arbitrary time intervals. Any resulting distribution
can be used as starting distribution of further computations.
The theoretical basis for the simulation program is discussed
in Ossenkopf (1993, 1994).