Cassini observation revealed various kinds of beautiful and interesting structures in Saturn’s ring. These structures is thought to be created by the physical interaction between ring particles and satellite. We are focusing on the gap structure created by the interaction between satellite embedded in the ring (e.g. Daphnis and Pan) and ring particles. It is known that the edge of these gap is sharply cut and density wave appears on the edge of the gap. Its physical mechanism was suggested in previous studies and it has been demonstrated by local N-body simulation so far (e.g. Borders et al. 1982, Lewis & Stewart 2000).
However, it is not clear whether we can completely understand the physics in Saturn's ring only with local simulation. In order to understand these physical structures comprehensively, we carried out the global N-body simulation of gap structure created by satellite taking into account of self-gravity and inelastic collision between particles. We used GPLUM code which was developed for planetary formation. The number of particles was about 10^5 and we carried out several runs changing satellite mass.
As a result, we were able to reproduce sharp edge, density wave and wall-like vertical structure. All these characteristic features were revealed by Cassini observation in fact. In this talk, I will introduce these series of simulation results and discuss about its dependence on satellite mass.