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Qualitative and quantitative analysis of non-periodic space-time homogenization problems for nonlinear diffusion equations

Research Project

Project/Area Number 22K20331
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0201:Algebra, geometry, analysis, applied mathematics,and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Oka Tomoyuki  東京大学, 大学院工学系研究科(工学部), 特任助教 (00962268)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords時空均質化問題 / 非線形拡散方程式 / 時空unfolding法 / 時空2スケール収束 / H-収束 / 収束レート / 均質化問題 / 非線形放物型方程式 / 非線形拡散
Outline of Research at the Start

本研究では, 非線形拡散方程式に対する非周期的時空均質化問題に取り組む. この問題では, 振動する係数行列場を含む偏微分方程式に対して, その極限方程式を意味する均質化方程式を厳密に導出する. 係数行列場に周期性を課した周期的均質化問題に於いては, 研究代表者の近年の研究によって定性的な性質が詳細に得られている. 本研究では, この結果を非周期的な場合へと拡張し, トポロジー最適化への応用を見据える.

Outline of Final Research Achievements

This study derived the homogenized equation for the space-time homogenization problem of nonlinear diffusion equations. Furthermore, the homogenized matrix was characterized, and it was clarified that differences in nonlinear diffusion deeply depend on the representation of the homogenized matrix. In particular, it was proved that the gradient of the solution does not converge strongly without imposing additional assumptions on the coefficient matrix field. Besides, H-convergence for a nonlinear problem was proved.

Academic Significance and Societal Importance of the Research Achievements

均質化問題は,数学のみならず材料科学を始めとした諸分野と深く関係しており,最適設計問題への応用の観点から,均質化問題の研究が進展することは学術的のみならず社会的にも重要である.また,既存の静的線形問題に対する均質化理論を動的非線形問題へと拡張することは,数学的理論の深化に留まらず,新たな融合領域研究の基礎も成す.

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (18 results)

All 2024 2023 2022

All Journal Article (7 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 8 results)

  • [Journal Article] Level set method via positive parts for optimal design problems of two-material thermal conductors2024

    • Author(s)
      Oka Tomoyuki
    • Journal Title

      Mathematics and Computers in Simulation

      Volume: 223 Pages: 299-306

    • DOI

      10.1016/j.matcom.2024.04.001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Qualitative analysis of space-time periodic homogenization for nonlinear diffusion equations2024

    • Author(s)
      Oka Tomoyuki
    • Journal Title

      RIMS Kokyuroku

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Construction of signed distance functions with an elliptic equation,2024

    • Author(s)
      Hasebe Takahiro, Masamune Jun, Oka Tomoyuki, Sakai Kota, Yamada Takayuki
    • Journal Title

      arXiv:2401.17665 [math.AP]

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Space-time homogenization for nonlinear diffusion2023

    • Author(s)
      Akagi Goro、Oka Tomoyuki
    • Journal Title

      Journal of Differential Equations

      Volume: 358 Pages: 386-456

    • DOI

      10.1016/j.jde.2023.01.044

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topology optimization method with nonlinear diffusion2023

    • Author(s)
      Oka Tomoyuki、Yamada Takayuki
    • Journal Title

      Computer Methods in Applied Mechanics and Engineering

      Volume: 408 Pages: 115940-115940

    • DOI

      10.1016/j.cma.2023.115940

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nesterov's acceleration for level set-based topology optimization using reaction-diffusion equations2023

    • Author(s)
      Oka Tomoyuki、Misawa Ryota、Yamada Takayuki
    • Journal Title

      Applied Mathematical Modelling

      Volume: 120 Pages: 57-78

    • DOI

      10.1016/j.apm.2023.03.024

    • Related Report
      2022 Research-status Report
  • [Journal Article] Corrector results for space-time homogenization of nonlinear diffusion2022

    • Author(s)
      Oka Tomoyuki
    • Journal Title

      Mathematics and Mechanics of Complex Systems

      Volume: 10 Issue: 2 Pages: 171-190

    • DOI

      10.2140/memocs.2022.10.171

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Qualitative analysis of space-time periodic homogenization for nonlinear diffusion equations2023

    • Author(s)
      岡 大将
    • Organizer
      RIMS Workshop Evolution Equations and Related Topics -Energy Structures and Quantitative Analysis-
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Level set-based topology optimization method with nonlinear diffusion2023

    • Author(s)
      岡 大将, 山田 崇恭
    • Organizer
      ICIAM 2023 minisymposia
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Homogenization problem for nonlinear boundary conditions and its applications to optimal design problems2023

    • Author(s)
      岡 大将, 喜多 航佑, 松島 慶
    • Organizer
      The 13th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Space-time periodic homogenization for nonlinear diffusion equation2023

    • Author(s)
      赤木 剛朗, 岡 大将
    • Organizer
      The 13th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 消散型波動方程式に対する準周期的時空均質化問題2023

    • Author(s)
      岡大将
    • Organizer
      日本数学会 2023 年度秋季総合分科会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Topology optimization problem with geometric constraints for manufacturing2023

    • Author(s)
      岡 大将
    • Organizer
      第1回形状設計数学セミナ
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Optimal design problem with geometric constraints for manufacturing2023

    • Author(s)
      岡 大将
    • Organizer
      Study Group “Functional Analysis and Applications”
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Corrector results for space-time homogenization of fast diffusion equations without assumptions for smoothness of coefficients2023

    • Author(s)
      岡 大将
    • Organizer
      日本数学会2023年度年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Homogenization problem with nonlinear boundary conditions and its application to topology optimization2023

    • Author(s)
      岡 大将
    • Organizer
      7th camp Homogenization and its related topics
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 非線形境界条件を伴うトポロジー最適化問題2023

    • Author(s)
      岡 大将, 喜多航佑, 松島慶
    • Organizer
      第19回日本応用数理学会研究部会連合発表会
    • Related Report
      2022 Research-status Report
  • [Presentation] 非線形境界条件を伴うトポロジー最適化について2022

    • Author(s)
      岡 大将
    • Organizer
      RIMS 共同研究(公開型) 偏微分方程式の解の幾何的様相
    • Related Report
      2022 Research-status Report
    • Invited

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Published: 2022-09-01   Modified: 2025-01-30  

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