Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...70...37s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 70, April 1987, p. 37-51. Research supported by the Emil Aaltonen Foundation and Finnish Academy o
Astronomy and Astrophysics
Astronomy
40
Astronomical Models, Kepler Laws, Particle Collisions, Rotating Bodies, Friction Factor, Kinetic Energy, Particle Size Distribution, Planets, Simulations, Collisions, Rotation, Particles, Friction, Shape, Surface, Velocity, Energy, Kinetics, Distribution, Period, Models, Impacts, Calculations, Theoretical Studies, Saturn, Rings, Thickness
Scientific paper
Numerical simulations of Keplerian systems consisting of 200 mutually colliding rotating particles show that friction and surface irregularity reduce the equilibrium velocity dispersion and transfer some of the energy of random velocities to rotational velocities. The results confirm the theoretical predictions of Salo (1987). Simulations are performed for identical and different particle sizes, and for a power-law distribution of sizes. Taking rotation into account is not found to alter the previously observed Rayleigh distribution of eccentricities and inclinations, while the components of the rotational velocities are found to follow a Gaussian distribution. Application to the rarefied regions of Saturn's rings suggests that friction is able to reduce the equilibrium geometric thickness by about one-half.
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