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Multi-scale radiation magnetohydrodynamic simualtions of star formation with Athena++

Research Project

Project/Area Number 17KK0091
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionOsaka University

Principal Investigator

Kengo Tomida  大阪大学, 理学研究科, 招へい教員 (70772367)

Project Period (FY) 2018 – 2019
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
Keywords宇宙物理学 / シミュレーション / 磁気流体力学 / 輻射輸送 / 数値シミュレーション / 計算物理学 / 宇宙物理 / 理論天文学 / 流体 / 計算物理 / 星形成
Outline of Final Research Achievements

I developed the Athena++ public radiation MHD simulation code in collaboration with Professor Stone's group at Princeton University. In this project, I extended the self-gravity solver using the Multigrid method to adaptive mesh refinement (AMR), and extended it to radiation transfer. I implemented a new self-gravity solver which is compatible with AMR. The implementation requires some additional cost on AMR but it works stably. Then I extended it to the simplest diffusion approximation of radiation transfer. The solver works when distribution of the diffusion coefficient is relatively smooth. However, it converges slowly when the diffusion coefficient is highly non-uniform and/or the system is strongly non-linear. I will try other methods for this and improve the stability of the scheme.

Academic Significance and Societal Importance of the Research Achievements

Athena++は輻射磁気流体シミュレーションコードであり、インターネット上で広く一般に公開している。自己重力ソルバや輻射輸送ソルバは宇宙物理学の幅広い問題に共通する基礎物理過程であり、これを実装し公開することは幅広くコミュニティに貢献する。また本コードを用いた講習会やユーザーズミーティングも開催しており、若手研究者の育成にも重要な役割を果たしている。また優れたシミュレーションコードは現在の宇宙物理学研究のインフラストラクチャと言えるものであり、国際的な共同研究の基盤ともなる。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (13 results)

All 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (7 results) (of which Int'l Joint Research: 6 results,  Invited: 5 results) Remarks (3 results)

  • [Int'l Joint Research] Princeton University(米国)2018

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Giant Protostellar Flares: Accretion-driven Accumulation and Reconnection-driven Ejection of Magnetic Flux in Protostars2019

    • Author(s)
      Takasao Shinsuke、Tomida Kengo、Iwasaki Kazunari、Suzuki Takeru K.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 878 Issue: 1 Pages: L10-L10

    • DOI

      10.3847/2041-8213/ab22bb

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nonideal MHD Simulation of HL Tau Disk: Formation of Rings2019

    • Author(s)
      Hu, X., Zhu, Z., Okuzumi, S., Bai, X.-N., Wang, L., Tomida, K., & Stone, J. M.
    • Journal Title

      The Astrophysical Journal

      Volume: 885 Issue: 1 Pages: 36-36

    • DOI

      10.3847/1538-4357/ab44cb

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Multigrid gravity solver on AMR for Athena++2020

    • Author(s)
      富田賢吾
    • Organizer
      令和元年度 国立天文台 天文シミュレーションプロジェクト ユーザーズミーティング
    • Related Report
      2019 Annual Research Report
  • [Presentation] Formation and Early Evolution of Protoplanetary Disks2019

    • Author(s)
      K. Tomida
    • Organizer
      Workshop on Star Formation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Formation and Early Evolution of Circumstellar Disks2019

    • Author(s)
      K. Tomida
    • Organizer
      Zooming in on Star Formation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global Non-ideal Magnetohydrodynamic Simulations of Protoplanetary Disks2019

    • Author(s)
      K. Tomida, K. Iwasaki, S. Takasao, S. Okuzumi, S. Mori, T. K. Suzuki
    • Organizer
      CCS International Symposium 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MHD Ssmulations with Athena++: from molecular clouds to protoplanetary disks2019

    • Author(s)
      Kengo Tomida
    • Organizer
      Max Planck Princeton Center Workshop 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Inside Athena++2019

    • Author(s)
      Kengo Tomida
    • Organizer
      Athena++ Users and Developers Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Athena++: a New MHD Simulation Code with Adaptive Mesh Refinement2018

    • Author(s)
      Kengo Tomida
    • Organizer
      The 8th East Asian Numerical Astrophysics Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] Athena++

    • URL

      https://princetonuniversity.github.io/athena/

    • Related Report
      2019 Annual Research Report
  • [Remarks] Athena++ 日本語サポートページ

    • URL

      https://www.astr.tohoku.ac.jp/~tomida/athena/

    • Related Report
      2019 Annual Research Report
  • [Remarks] Athena++日本語サポートページ

    • URL

      http://astro-osaka.jp/tomida/athena/

    • Related Report
      2018 Research-status Report

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Published: 2018-01-25   Modified: 2022-06-09  

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