JAMSTEC > Research Institute for Value-Added-Information Generation (VAiG) > Center for Mathematical Science and Advanced Technology (MAT) > Member > Natsuki Hosono

Center for Mathematical Science and Advanced Technology (MAT)

Members

Natsuki Hosono

photo

Scientist
Japan Agency for Marine-Earth Science and Technology
Center for Mathematical Science and Advanced Technology

3173-25, Showa-machi, Kanazawa-ku, Yokohama-city, Kanagawa, 236-0001, Japan
natsuki.hosono_at_jamstec.go.jp


Short CV

Numerical simulations of the origin of the Earth and the Moon.

Employment

Apr, 14 - May, 16 Advanced Institute for Cumputatinal Science, RIKEN
May, 16 - Sep, 17 Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto Uni.
Sep, 17 - Now Mathematical science and Advanced Technology, JAMSTEC

Education

Apr, 09 - Mar, 11 MSc in Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology
Apr, 11 - Mar, 14 PhD in Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology

Research Topics

Formation of the Moon

The diversity of the planets in the Solar System is an important topic. Especially, the Earth harbours a relatively large moon compared to the central planet. Amongst several candidates of the origin of the Moon, the Giant Impact hypothesis is one of the most attractive hypothesis. According to the hypothesis, about 4.6 billion years ago, a Mars-sized proto-planet hit the proto-Earth and generate circumterrestrial debris disc. Then, the disc was accumulated in the Earth's Moon. Since the Giant Impact is a highly energetic event, it also determines the evolution of the early Earth.

On the other hand, we cannot carry out laboratory experiments of the Giant Impact. Hence, in order to check whether the scenario can really form the Moon, numerical simulations of the scenario play the important role. The following figure is an example of numerical simulations of the Giant Impact, which is carried out by a particle-based numerical hydrodynamical scheme, Smoothed Particle Hydrodynamics (SPH).

The result of GI
The result of GI

High Performance Computing
However, these numerical simulations often cost a lot in electricity and also require wall-clock time. Hence, we need to apply techniques to accelerate the calculation speed, e.g., a fast algorithm to perform neighbour search and external devices accelerate calculations. Our purpose is to programme an SPH code which involves the above two techniques to finish a run as quickly as possible. The following figure shows an example of such runs. The figure shows a snapshot of the accumulation process of the Moon from the debris disc, which is currently the highest resolution.
Accumulation of the Moon
Accumulation of the Moon

Publications

Original Publications (Peer-Reviewed)

  • “Particle Number Dependence of The N-Body Simulations of Moon Formation”, Sasaki, T. \& Hosono, N., in press., Astrophysical Journal, in press.
  • “Unconvergence of Very Large Scale GI Simulations”, Hosono, N., Iwasawa, M., Tanikawa, A., et al., 2017, Publications of the Astronomical Society of Japan, 69, 26
  • “The giant impact simulations with density independent smoothed particle hydrodynamics”, Hosono, N., Saitoh, T. R., Makino, J., Genda, H., \& Ida, S, 2016, Icalus, 271, 131
  • “A comparison of SPH artificial viscosities and their impact on the Keplerian disk”, Hosono, N., Saitoh, T. R., Makino, 2016, Astrophysical Journal Supplement, 224, 32
  • “Implementation and performance of FDPS: A Framework Developing Parallel Particle Simulation Codes”, Iwasawa, M., Tanikawa, A., Hosono, N., et al. 2016, Publications of the Astronomical Society of Japan, 68, 54
  • “Density-Independent Smoothed Particle Hydrodynamics for a Non-Ideal Equation of State”, Hosono, N., Saitoh, T.~R., \& Makino, J. 2013, Publications of the Astronomical Society of Japan, 65, 108

Proceeings (Peer-Reviewed)

  • “FDPS: a novel framework for developing high-performance particle simulation codes for distributed-memory systems”, Iwasawa, M., Tanikawa, A., Hosono, N., et al., 2015. In Proceedings of the 5th International Workshop on Domain-Specific Languages and High-Level Frameworks for High Performance Computing (WOLFHPC '15)
  • “Automatic generation of efficient codes from mathematical descriptions of stencil computation”
  • Muranushi, T., et al. (11th author)., 2016., In Proceedings of the 5th International Workshop on Functional High-Performance Computing (FHPC 2016)
  • “Simulations of below-ground dynamics of fungi: 1.184 pflops attained by automated generation and autotuning of temporal blocking codes”
  • Muranushi, T., et al. (8th author)., 2016., In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC '16)