[M-GI32] [JJ] 計算科学による惑星形成・進化・環境変動研究の新展開

[MGI32-03] GPU-accelerated High-resolution N-body Simulations for Planet Formation Toward 100 Million Particles

*堀 安範^1,2、押野 翔一³、岩澤 全規⁴、藤井 通子⁵ (1.自然科学研究機構 アストロバイオロジーセンター、2.国立天文台 太陽系外惑星探査プロジェクト室、3.国立天文台 天文シミュレーションプロジェクト、4.理化学研究所 計算科学研究機構、5.東京大学 理学系研究科天文学専攻)

キーワード：惑星形成、N体計算、GPU

We developed a fully-parallelized hybrid N-body code for planet formation (PENTACLE: Iwasawa et al., submitted), implementing the P³T method (Oshino et al., 2011) and a multi-purpose platform for a parallelized particle-particle simulation (FDPS: Iwasawa et al., 2016) into it. PENTACLE enables us to handle up to ten million particles for N-body simulations in a collisional system, using a present-day supercomputer. Toward a high-resolution N-body simulation with 100 million particles and beyond, we are now developing a parallelized hybrid N-body code optimized for a NVIDIA-based GPU cluster. In this talk, we show the performance and capability of PENTACLE and results of terrestrial planet formation in a narrow ring containing one (and ten) million planetesimals. Then, we introduce the current status of our GPU-accelerated N-body code (PENTAGLE) and our future plans, for example, a global simulation of the delivery of water to the Earth in the protosolar nebula.