[A-CG08] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River Runoff

[ACG08-P01] Density Independent Smoothed Particle Hydrodynamicsを用いた衝突・クレータリングの数値計算

*細野 七月¹、岩澤 全規¹、谷川 衝^1,2、似鳥 啓吾¹、村主 崇行¹、牧野 淳一郎^1,3 (1.理化学研究所 計算科学研究機構、2.東京大学大学院総合文化研究科 教養学部、3.東京工業大学 地球生命研究所)

キーワード：衝突数値計算

Impacts of meteorite are important phenomenon for the planetary geology. Since these processes cannot be experimented
in laboratories, numerical hydrodynamical simulations of the impact process play important role. For these processes,
particle based numerical hydrodynamical simulations have several advantages over grid-based methods, because these
processes often involve large deformation of target and oblique impacts.
The Smoothed Particle Hydrodynamics (SPH) is a widely used particle based numerical hydrodynamical scheme.
It is first developed in astrophysical field. Recently, it was adopted to the impact cratering. However,
it has been pointed out that the standard SPH formulation has difficulties in the treatment of contact
discontinuity; an unphysical repulsive force acts between two different materials, such as rock and water.
Thus, we have developed new particle based hydrodynamical, Density Independent SPH (DISPH), which overcomes
this difficulty.
We have developed a new massively parallel particle based numerical hydrodynamical simulations code by means of
DISPH. We adapted Framework for Developing Particle Simulator (FDPS), which enables us to perform high-performance
parallel particle simulations easily. We will show the results of impacts of the tuff to the water with both DISPH
and SSPH.