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複雑性のシミュレーション研究

Research Project

Project/Area Number 09878090
Research Category

Grant-in-Aid for Exploratory Research

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionNational Institute for Fusion Science

Principal Investigator

佐藤 哲也  核融合科学研究所, 理論・シミュレーション研究センター, 教授 (80025395)

Co-Investigator(Kenkyū-buntansha) 堀内 利得  核融合科学研究所, 理論・シミュレーション研究センター, 教授 (00229220)
渡邊 國彦 (渡辺 国彦 / 渡辺 國彦)  核融合科学研究所, 計算センター, 教授 (40220876)
林 隆也  核融合科学研究所, 理論・シミュレーション研究センター, 教授 (60156445)
高丸 尚教  核融合科学研究所, 理論・シミュレーション研究センター, 助手 (20241234)
冨田 幸博  核融合科学研究所, 理論・シミュレーション研究センター, 助教授 (40115605)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Keywords自己組織化現象 / 秩序形成 / 計算機シミュレーション / 複雑性 / 構造形成 / 粒子シミュレーション / 磁気流体 / 普遍的法則性
Research Abstract

本年度は、バーチャルリアリティ装置に音響表現を付加し、シミユレ一ション結果を総合的に表現する手法を開発した。まだ試作段階であるが、この装置を活用し、自己組織化仮説を検証するための視聴覚表現ソフトウェアの開発を行いつつ、複雑性シミュレーション研究を行った。得られた具体的成果は、1)開いた系におけるレーザとプラズマとの強い相互作用について、レーザ強度のわずかな空間非一様性がプラズマ内の衝撃波の構造に大きな影響を与え、更に引き続いて起こる流体的不安定成長と熱輸送に大きな非一様性を生み出し、最終的な構造の歪みを生み出すことを明らかにした。2)ダストプラズマにおいて、微粒子が成長していくための必要条件である微粒子のフリップフロップ的帯電過程は、背景プラズマの温度と微粒子の大きさに強く依存し、そのパラメータ領域は非常に限定されるものであること、その一方、背景プラズマの密度そのものは、微粒子の大きさをデバイ半径を単位としてみる限り、影響が大きくないことを明らかにした。3)高分子の構造形成機構を分子レベルで解明するため、鎖状分子の分子動力学シミュレーションを行い、配向秩序構造の形成過程を解析した。その結果、高温でランダム状態にある高分子鎖を冷却することにより、配向秩序構造が段階的に形成されていく様子を実証した。これらのシミュレーション結果以外に、プラズマ内の圧力構造が圧力自身によって破壊・再構築される、圧力駆動型不安定性による構造変換過程についてのシミュレーシ.ヨンモデルを構築し、それに基づいてシミユレ一ションコードを開発した。現在このコードのテストランを行っている。

Report

(3 results)
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (41 results)

All Other

All Publications (41 results)

  • [Publications] Y. Tamura: "Virtual Reality System for Comprehending Complex Phenomena"Prog. Theor. Phys. Suppl.. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T .Hayashi: "Nonlinear Simulation of Relaxation Phenomena in Spherical Tokamak"Chinese Phys. Lett. Suppl.. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tomita: "Particle Simulation on Plasma Detachment"J. Plasma Fusion Res.. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.-H. Watanabe: "Nondissipative kinetic simulation and analytical solution of three-mode equations of the ion temperature gradient instability"Phys. Plasmas. 7・3. 984-990 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] N. Mizuguchi: "Dynamics of spherical tokamak plasma on the internal reconnection event"Phys. Plasmas. 7・3. 940-949 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.-H. Watanabe: "Modeling of magnetic island formation in magnetic reconnection experiment"Phys. Plasmas. 6・4. 1253-1257 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H. Nakamura: "Transport Coefficients of Indium Antimonide in a Magnetic Field"Jpn. J. Appl. Phys.. 38・10. 5745-5749 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A. Kageyama: "Dynamo efficiency and Beltrami flows in rectangular cells"Phys. Plasmas. 6・3. 771-776 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A. Kageyama: "Transitions of the Magnetic Intensity and Polarity Reversals in the Magnetohydrodynamic Dynamo"Phys. Rev. Lett.. 82・26. 5409-5412 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Ishiguro: "Open boundary particle simulation of electrostatic ion cyclotron instability"J.Plasma Phys.. 61・3. 407-414 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] R. Horiuchi: "Three-dimensional Particle Simulation of Plasma Instabilities and Collisionless Reconnection in a Current Sheet"Phys. Plasmas. 6・12. 4565-4574 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] R. Horiuchi: "Collisionless magnetic reconnection in the presence of external driving flow"J.Plasma Phys.. 61・3. 415-423 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Goto: "Passive scalar spectrum in isotropic turbulence : Prediction by the Lagrangian direct-interaction approximation"Phys. Fluids. 11・7. 1936-1952 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Todo: "Nonlinear Simulation Study of Alfven Eigenmodes"J. Plasma Fusion Res.. 75・5. 567-571 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Fujiwara: "Molecular dynamics simulation of structure formation of short chain molecules"J. Chem. Phys.. 110・19. 9757-9764 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Fujiwara: "Molecular Dynamics Study of the Structural Formation of Short Chain Molecules : Structure and Molecular Mobility"Mol. Simul.. 21. 271-281 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T. Hayashi: "Self-Organizing Plasmas"Plasma Phys. Control. Fusion. 41・3. A229-A238 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. Watanabe: "Simulation Studies on Grain Charging / Coagulation in Dusty Plasmas"J. Plasma and Fusion Res. SERIES. 2. 173-176 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 木田重雄: "乱流力学"朝倉書店. 450 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Todo et al.: "A Particle Algorithm for Linear Kinetic Analysis in Tokamak Plasma" J.Comp.Phys. 141・1. 37-45 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Fujiwara et al.: "Molecular Dynamics Simulation of Structural formation of Short Polymer Chains" Phys.Rev.Lett.80・5. 991-994 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Todo et al.: "Particle-magnetohydrodynamic Simulations of the Toroidal Alfven Eigenmode" Phys.Plasmas. 5・5. 1321-1327 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Bazdenkov et al.: "Topological Transformations in Isolated Straight Magnetic Tubes" Astrophys.J.500・2. 966-977 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] B.Dasgupta et al.: "Relaxed States of a Magnetized Plasma with Minimum Dissipation" Phys.Rev.Lett.81・15. 3144-3147 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Horiuchi: "Collisionless magnetic reconnection in the presence of external driving flow" J.Plasma Phys.(in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Horiuchi et al.: "Particle Simulation of Collisionless Reconnection in Three Dimensions" Plasma Physics and Controlled Fusion. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Hayashi et al.: "Self-Organizing Plasmas" Plasma Physics and Controlled Fusion. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Lj.R.Hadzievski et al.: "Simulation of Weak and Strong Langmuir Collapse Regimes" Phys.Lett.A. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Hayashi et al.: "Nonlinear Simulations of Internal Reconnection Event in Spherical Tokamak" Plasma Physics and Controlled Nuclear Fusion Research. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Horiuchi et al.: "Kinetic Stabilization of Tilt Disruption in Field-Reversed Configurations" Plasma Physics and Controlled Nuclear Fusion Research. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Todo et al.: "Kinetic-Magnetohydrodynamic Simulation Study of Fast lons and Toroidal Alfven Eigenmode" Plasma Physics and Controlled Nuclear Fusion Research. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Sato: "A New Synthetic Approach to Science of Complexity: The MISSION Project at NIFS" Chinese Phys.Lett.(in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Horiuchi et al.: "Three-Dimensional Particle Simulation of Collisionless Driven Reconnection" Chinese Phys.Lett.(in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Tomita et al.: "Particle Simulation on Detached Plasma" Chinese Phys.Lett.(in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Sato: "Can Plasma Physics take a Leadership in the 21st Century's Science" Physics of Ionized Gases. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Horiuchi: "Particle Simulation Study of Collisionless Driven Reconnection in a Sheared Magnetic Field" Phys.Plasmas. Vol.4,no.2. 277-289 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.-H.Watanabe: "Magnetohydrodynamic simulation on co- and counter-helicity merging of spheromaks and driven magnetic reconnection" Phys.Plasmas. Vol.4,no.5. 1297-1307 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Kageyama: "Generation mechanism of a dipole field by a magnetohydrodynamic dynamo" Phys.Rev.E. Vol.55,no.12. 4617-4626 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Fujiwara: "Molecular dynamics simulation of structural formation of short polymer chains" Phys.Rev.Lett.Vol.80,no.4. 991-994 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Todo: "Linear and Nonlinear Particle-Magnetohydrodynamic Simulations of the Toroidal Alfven Eigenmode" Phys.Plasmas. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Watanabe: "Computer Simulation Studies of Dust Charging and Coagulation Processes in Dusty Plasmas" Plasma Phys.Control.Fusion. (in press). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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