Geodynamo simulation in low viscosity regime with next-generation supercomputer and three-dimensional visualization

2015 Fiscal Year Final Research Report

• Project/Area Number: 23340128
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kobe University
• Principal Investigator: Kageyama Akira 神戸大学, システム情報学研究科, 教授 (20260052)
• Co-Investigator(Renkei-kenkyūsha): MASADA Youhei 愛知教育大学, 現代学芸課程宇宙物質科学専攻, 助教 (30590608) ; MIYAGOSHI Takehiro 海洋研究開発機構, 地球深部ダイナミクス研究分野, 主任研究員 (60435807) ; OHNO Nobuaki 兵庫県立大学, シミュレーション学研究科, 教授 (50373238)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 地球ダイナモ / 磁気流体力学 / データ可視化 / イン=ヤン格子

Outline of Final Research Achievements

We have performed high-resolution simulations of geodynamo in the spherical shell geometry using Yin-Yang grid and analyzed the generation mechanism of the magnetic field based on the concept of (almost) frozen-in field lines. Since our Yin-Yang dynamo code had a "cavity" at the center of the sphere, we could not solve the magnetic diffusion effect in the inner core. To resolve this problem, we have developed a new overset grid system, Yin-Yang-Zhong grid, for a full sphere including the origin. The Yin-Yang-Zhong grid enables us to perform MHD simulations in a ball. To analyze the geodynamo simulation data obtained by these simulation codes, we have developed an application program for immersive-type virtual reality (VR) systems. The VR visualization approach shares the problem of the massive data size with other post-process visualization methods. We have developed a new in-situ visualization method by which we can perform interactive viewing of in-situ visualization movies.

Free Research Field

計算科学