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We study the B ring's complex optical depth structure. The source of thisstructure may be the complex dynamics of the Keplerian shear and theself-gravity of the ring particles. The outcome of these dynamic effectsdepends sensitively on the collisional and physical properties of theparticles. Two mechanisms can emerge that dominate the macroscopic physicalstructure of the ring: self-gravity wakes and viscous overstability. Here westudy the interplay between these two mechanisms by using our recentlydeveloped particle collision method that allows us to better model theinter-particle contact physics. We find that for a constant ring surfacedensity and particle internal density, particles with rough surfaces tend toproduce axisymmetric ring features associated with the viscous overstability,while particles with smoother surfaces produce self-gravity wakes.

Numerical Simulations of Saturn's B Ring: Granular Friction as a Mediator between Self-Gravity and Viscous Overstability