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2014 Fiscal Year Annual Research Report

非ニュートン流体の運動の数学解析

Research Project

Project/Area Number 23654055
Research InstitutionKeio University

Principal Investigator

谷 温之  慶應義塾大学, 理工学部, 名誉教授 (90118969)

Co-Investigator(Kenkyū-buntansha) 井口 達雄  慶應義塾大学, 理工学部, 教授 (20294879)
高山 正宏  慶應義塾大学, 理工学部, 助教 (90338252)
野寺 隆  慶應義塾大学, 理工学部, 教授 (50156212)
Project Period (FY) 2011-04-28 – 2015-03-31
Keywordsprimitive equation / Hele-Shaw flow / water wave / Hasegawa-Wakatani 方程式 / Stepanov-almost-periodic / vortex filament / 国際研究者交流 / アメリカ, 台湾, ロシア
Outline of Annual Research Achievements

(1)津波のモデル方程式の基礎となる水の波の運動に対して, (i)水底の凹凸が時間変化する場合の影響について考察した. その時間変化が比較的遅い場合には,水の波の基礎方程式系が変形 Green-Naghdi 方程式によって高次近似されることを証明した; (ii)水の波の基礎方程式系が有する変分構造から導かれた Lagrangian における速度ポテンシャルを近似することにより得られた近似 Lagrangian に対する Euler-Lagrange 方程式の初期値問題を考察した.その初期値問題は, 初期面が特性曲面となっているので,一般には可解でないが, その可解性のための必要十分条件の特徴付けを与えた.さらに,自明解における線形近似方程式系が,浅水波近似と見なせること,Green-Naghdi 方程式よりも高次近似方程式となっていることを示した. (2)Hurricane モデル方程式の研究に関しては, 3次元半空間内における渦糸運動,特に渦糸端点での境界条件が曲率が零になる場合と境界面に直交する場合に対する初期値-境界値問題の時間局所的適切性を証明した. (3)Hele-Shaw セル中の fingering 現象に対して, ニュートン流体運動に境界濡れ効果を取入れた自由境界問題の弱非線形解析を行った. この結果の非線形数学解析を, 準定常近似法を用いて行った. (4)数値気象予報における基礎方程式である大気/海洋2相モデル方程式系の自由境界問題に対する可解性を証明した. (5)プラズマ物理学関連の研究としては, 抵抗性ドリフト波乱流の2粒子モデル方程式である Hasegawa-Wakatani 方程式に対する初期-境界値問題の可解性を, 初期値がステパノフの意味での概周期関数である場合に証明した.

  • Research Products

    (24 results)

All 2016 2015 2014

All Journal Article (8 results) (of which Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (16 results) (of which Invited: 13 results)

  • [Journal Article] Initial boundary value problem for model equations of resistive drift wave turbulence with Stepanov-almost-periodic initial data2016

    • Author(s)
      S. Kondo and A. Tani
    • Journal Title

      Ann. Sc. Norm. Super. Pisa Cl. Sci.

      Volume: - Pages: -

    • Peer Reviewed
  • [Journal Article] Some boundedness of solutions for the primitive equations of the atmosphere and the ocean2015

    • Author(s)
      H. Honda and A. Tani
    • Journal Title

      ZAMM

      Volume: 95 Pages: 38-48

    • Peer Reviewed / Open Access
  • [Journal Article] On the strong solvability of primitive equations for the coupled atomosphere and ocean model2015

    • Author(s)
      H. Honda and A. Tani
    • Journal Title

      NEFU

      Volume: - Pages: -

    • Peer Reviewed
  • [Journal Article] A shallow water approximation for water waves over a moving bottom2015

    • Author(s)
      H. Fujiwara and T. Iguchi
    • Journal Title

      Adv. Stud. Pure Math.

      Volume: - Pages: -

    • Peer Reviewed
  • [Journal Article] Solvability of the initial value problem to a model system for water waves2015

    • Author(s)
      Y. Murakami and T. Iguchi
    • Journal Title

      Kodai Math. J.

      Volume: - Pages: -

    • Peer Reviewed
  • [Journal Article] Effect of the wetting layer on the fingering pattern in a Hele-Shaw cell2014

    • Author(s)
      H. Tani and A. Tani
    • Journal Title

      J. Phys. Soc. Japan

      Volume: 80 Pages: 034401-1-4

    • Peer Reviewed / Open Access
  • [Journal Article] Existence, uniqueness, and regularity for the Kuramoto-Sakaguchi equation with unboundedly supported frequency distribution2014

    • Author(s)
      M.M. Lavrentiev, Jr., R. Spigler and A. Tani
    • Journal Title

      Diff. Integr. Eq.

      Volume: 27 Pages: 879-892

    • Peer Reviewed
  • [Journal Article] Motion of a vortex filament with axial flow in the half space2014

    • Author(s)
      M. Aiki and T. Iguchi
    • Journal Title

      Ann. Inst. H. Poincare Anal. Non Lineaire

      Volume: 31 Pages: 1311-1335

    • Peer Reviewed
  • [Presentation] Nuclear astrophysics I, II2015

    • Author(s)
      A. Tani
    • Organizer
      現象解析特別セミナー第7回
    • Place of Presentation
      茨城大学 (水戸)
    • Year and Date
      2015-03-16 – 2015-03-16
    • Invited
  • [Presentation] Solvability of a model system for water wave to a model system for water waves2015

    • Author(s)
      A. Iguchi
    • Organizer
      The 7th Nagoya Workshop on Differential Equations
    • Place of Presentation
      名古屋大学 (名古屋)
    • Year and Date
      2015-03-05
    • Invited
  • [Presentation] Solvability of a model system for water wave to a model system for water waves2015

    • Author(s)
      T. Iguchi
    • Organizer
      Mathematical Analysis on Fluid Dynamics and Conservation Laws
    • Place of Presentation
      東京工業大学 (東京)
    • Year and Date
      2015-01-23
    • Invited
  • [Presentation] A New Approach to SR Algorithm for Solving Eigenvalue Problems2014

    • Author(s)
      T. Nodera
    • Organizer
      CTAC 2014
    • Place of Presentation
      Australian National University (Canberra, Australia)
    • Year and Date
      2014-12-02
  • [Presentation] Analysis of Lanczos Type Method for Computing PageRank2014

    • Author(s)
      T. Nodera
    • Organizer
      CTAC 2014
    • Place of Presentation
      Australian National University (Canberra, Australia)
    • Year and Date
      2014-12-02
  • [Presentation] Practical use of nonlinear GMRES for solving unconstrained optimization2014

    • Author(s)
      T. Nodera
    • Organizer
      CTAC 2014
    • Place of Presentation
      Australian National University (Canberra, Australia)
    • Year and Date
      2014-12-01
  • [Presentation] Solvability of the initial value problem to a model system for water waves2014

    • Author(s)
      A. Iguchi
    • Organizer
      慶應力学系セミナー
    • Place of Presentation
      慶應義塾大学 (横浜)
    • Year and Date
      2014-11-26
    • Invited
  • [Presentation] 水の波の方程式2014

    • Author(s)
      T. Iguchi
    • Organizer
      非線形偏微分方程式 冬の学校 '14 in 札幌
    • Place of Presentation
      北海道大学 (札幌)
    • Year and Date
      2014-11-21 – 2014-11-22
    • Invited
  • [Presentation] Solvability of a model system for water wave to a model system for water waves2014

    • Author(s)
      T. Iguchi
    • Organizer
      Linear and Nonlinear Waves, No.12
    • Place of Presentation
      ピアザ淡海 滋賀県立県民交流センター (大津)
    • Year and Date
      2014-11-13
    • Invited
  • [Presentation] Classical solvability of the two-phase radial viscous fingering problem in a Hele-Shaw cell2014

    • Author(s)
      A. Tani
    • Organizer
      International Conference on Mathematical Fluid Dynamics, Present and Future
    • Place of Presentation
      Waseda University (Tokyo, Japan)
    • Year and Date
      2014-11-11
    • Invited
  • [Presentation] Classical solvability of the radial viscous fingering problem in a Hele-Shaw cell2014

    • Author(s)
      A. Tani
    • Organizer
      Classical Problems and New Trends in Mathematical Fluid Dynamics
    • Place of Presentation
      University of Ferrara (Ferrara, Italy)
    • Year and Date
      2014-10-02
    • Invited
  • [Presentation] Astrophysical magnetic field and dynamo theory I, II2014

    • Author(s)
      A. Tani
    • Organizer
      現象解析特別セミナー第6回
    • Place of Presentation
      東京理科大学 (東京)
    • Year and Date
      2014-09-05 – 2014-09-06
    • Invited
  • [Presentation] Solvability of the initial value problem to a model system for water waves2014

    • Author(s)
      T. Iguchi
    • Organizer
      京都大学NLPDEセミナー
    • Place of Presentation
      京都大学 (京都)
    • Year and Date
      2014-07-11
    • Invited
  • [Presentation] Small-time solvability of primitive equations of the coupled atmosphere and ocean2014

    • Author(s)
      A. Tani
    • Organizer
      7th International Conference on Mathematical Modelling
    • Place of Presentation
      North-Eastern Federal University (Yakutsk, Russia)
    • Year and Date
      2014-06-30
    • Invited
  • [Presentation] Small-time solvability of primitive equations of the coupled atmosphere and ocean2014

    • Author(s)
      A. Tani
    • Organizer
      Progress in Nonlinear Partial Differential Equations
    • Place of Presentation
      University of Lisbon (Lisbon, Portugal)
    • Year and Date
      2014-05-29
    • Invited
  • [Presentation] Solvability of the initial value problem to a model system for water waves2014

    • Author(s)
      T. Iguchi
    • Organizer
      神楽坂解析セミナー
    • Place of Presentation
      東京理科大学 (東京)
    • Year and Date
      2014-04-26
    • Invited

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Published: 2016-06-01  

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