• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Numerical Simulation of spiral shocks in accretion discs and comparison with observations

Research Project

Project/Area Number 10640231
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionKOBE UNIVERSITY

Principal Investigator

MATSUDA Takuya  Kobe University Faculty of Science Professor, 理学部, 教授 (20026206)

Co-Investigator(Kenkyū-buntansha) YOSHITSUGU Nakagawa  Kobe University Faculty of Science Professor, 理学部, 教授 (30172282)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsACCRETION DISC / SPIRAL SHOCK / NUMERICAL SIMULATION / 数値シミュレーション / コンパクト星 / 降着流 / 近接連星系 / IP Peg. / 太陽風 / 星間ガス
Research Abstract

An accretion disc is a gas disc formed around a compact object such as a white dwarf, a neutron star or a black hole. In the present research we performed three-dimensional numerical simulation of an accretion disc in a close binary system. The method employed was a finite volume method called SFS scheme using a Riemann solver. The computational region includes a main star accreting mass and a companion star losing mass. As an equation of state of gas we employed that of the perfect gas. We found that the gas stream (L1 stream) flowing through the L1 point penetrates into the accretion disc in the parameter range considered. We also found that the disc gas rotating about the main star hits the L1 stream and forms an elongated shock. We termed it as the L1 shock. Because of the L1 shock, the disc gas loses its angular momentum and accretes to the main star. We have proposed a mechanism of angular momentum loss by spiral shocks, but its magnitudes may not be large enough to explain observations. The angular momentum loss by the L1 shock was found to be large enough. In 1997 British astronomers discovered spiral structure proposed by us in the cataclysmic variable IP Pegasi. Since then the spiral shock model attracted much attention in the community. The penetration was also discovered recently.
One of problems in the above simulation is that radiation cooling was not taken into account explicitly. Instead we reduce the specific ratio from 5/3 to 1.01. In the future research we plan to employ Direct Simulation Monte Carlo method. We already obtained a preliminary result for a two-dimensional case. We plan to extend it to three-dimension, and try to simulate a raditive transfer by solving thermal conduction explicitly.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] E.Hayashi: "Is angular momentum in an accretion disk transported inwards?"Progress of Theoretical Physics. 印刷中. (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Matsuda: "Numerical Simulation of Accretion Disks in Close Binary Systems and Discovery of Spiral Shocks"Astrophysics and Space Science. 274. 259-273 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Makita: "Two-and Three Dimensional Numerical Simulations of Accretion Discs in Close Binary System"Monthly Notices of Royal Astronomical Society. 316. 906-916 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.V.Pogorelov: "Nonevolutionary MHD shocks in the solar wind and interstellar medium interaction"Astronomy and Astrophysics. 354. 697-702 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.V.Pogorelov: "Towards steady-state solutions for supersonic wind accretion on to gravitating objects"Monthly Notices of Royal Astronomical Society. 313. 198-208 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] E.Hayashi: "Is angular momentum in an accretion disk transported inwards?"Progress of Theoretical Physics. (to be published). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Matsuda: "Numerical Simulation of Accretion Discs in Close Binary Systems and Discovery of Spiral Shocks."Astrophys. Space Sci.. 274. 259-273 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Makoto Makita: "Two-and Three-Dimensional Numerical Simulations of Accretion Discs in a Close Binary System."MNRAS. 316. 906-916 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.V.Pogorelov: "Nonevolutionary MHD shocks in the solar wind and interstellar medium interaction."Astron. & Astrophys. 354. 697-702 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.V.Pogorelov: "Towards steady-state solutions for supersonic wind accretion on to gravitating objects."MNRAS. 313. 198-208 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Eiji Hayashi: "Is angular momentum in an accretion disk transported inwards?"Progress of Theoretical Physics. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Takuya Matsuda: "Numerical Simulation of Accretion Discs in Close Binary Systems and Discovery of Spiral Shocks"Astrophys. Space Sci.. 274. 259-273 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Makoto Makita: "Two- and Three-Dimensional Numerical Simulations of Accretion Discs in a Close Binary System"Monthly Notices of Royal Astronomical Society. 316. 906-916 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.V.Pogorelov: "Nonevolutionary MHD shocks in the solar wind and interstellar medium interaction"Astron. & Astrophys. 354. 697-702 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.V.Pogorelov: "Towards steady-state solutions for supersonic wind accretion on to gravitating objects"Monthly Notices of Royal Astronomical Society. 313. 198-208 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 宮西正宜 編: "科学技術と人間の関わりII"大阪大学出版会. 256 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 林晋 編: "パラドックス"日本評論社. 239 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Matsuda: "Spiral Structure in IP Peg:Confrontig Theory and Observation"Proceedings of Numerical Astrophysics 1998. 207-209 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Makita: "3D Finite Volume Simulation of Accretion Discs with Spiral Shocks"Proceedings of Numerical Astrophysics 1998. 227-228 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.M.J.Boffin: "Three-dimersional SPH simulations of acoretion disks"Disk instabilities in close binary systems. 137-142 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Matsuda: "3D simulations of the spiral structure"Disk instabilities in close binary systems-25 years of the disk instavbility models. 129-136 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.K.Tanaka: "Shock Heating dve to Accretion of a Clumpy Cloud on to a Protoplanetary Disk"Icarus 134. 137-154 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Hidaka: "Settling and Growth of Fractal Dust Aggregates in a Laminar Solar Nebula"Icarus. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] E.Shima: "Numerical computation of two dimensional wind accretion of isothermal gas." Astronomy and Astrophysics. 337. 311-320 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Pogorelov: "Application of numerical methods to modeling the stellar wind and..." Computational Fluid Dynamics Review 1998. 2. 932-962 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Pogorelov: "Influence of the interstellar magnetic field direction on the shape of..." J.Geophysical Research 1998. 103. 237-245 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Nio: "Effect of Radiation Drag on Hoyle-Lyttleton Accretion." Publcations of Astronomical Society of Japan. 50. 495-500 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Nakagawaほか: "Dust Properties and Assembly of Large Particles in Protoplanetary Disks." Protostars and Planets. IV(in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y. Hidaka: "Settling and Coagulation of Fractal Dust Aggregates in a Laminar Solar..." Icarus,in press. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 中川義次ほか: "天文ハンドブック" 朝倉書店(印刷中), (1999)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi