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Solvability for a nonlinear heat equation with singular initial data

Research Project

Project/Area Number 19K14569
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionShizuoka University

Principal Investigator

Fujishima Yohei  静岡大学, 工学部, 准教授 (70632628)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords半線形熱方程式 / 準自己相似性 / 可解性 / 初期値の特異性 / 初期値の空間減衰 / 藤田指数 / 時間大域解 / 時間局所解 / 特異性 / 時間大域可解性 / 時間局所可解性 / 自己相似性 / 非線形熱方程式 / 爆発問題
Outline of Research at the Start

固体燃料の燃焼モデルなどの化学反応による発熱の温度分布を記述する方程式である非線形熱方程式は、拡散と反応が同時に進行する過程を記述し、その解析は数学的にも興味深い。本研究では特に、解の特異性形成という非線形方程式特有の現象に着目し、拡散と反応の釣り合いによって特徴づけされる、解の存在・非存在を分ける臨界の初期値の特異性を明らかにする。さらには時間大域可解性についても論じ、一般の非線形性を有する熱方程式に対する可解性の理論を構築する。

Outline of Final Research Achievements

This research project is devoted to the solvability and the behavior of solutions for general semilinear heat equation which does not possess the self-similarity. Although the solvability for a semilinear heat equation in previous studies is based on the scale invariant property for the equation, this property is not expected for a wide class of semilinear heat equations except for a power and an exponential type nonlinearity. Principal investigator focused on a generalization of the self-similar transformation for power type semilinear heat equation, and characterized the solvability for a general semilinear heat equation by using a quasi self-similar transformation.

Academic Significance and Societal Importance of the Research Achievements

本研究課題では、冪乗型や指数型半線形熱方程式に対して知られている自己相似変換を一般化した準自己相似変換に着目し、半線形熱方程式の研究を行った。特に準自己相似性が半線形熱方程式の可解性に応用可能であり、方程式の解の存在および非存在に対して精緻な結果が得られることを示した。これは準自己相似性の有用性を表すものであり、これまでの自己相似性に基づく解析手法を、一般の半線形熱方程式に対して拡張可能であることを示唆するものである。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 4 results)

  • [Int'l Joint Research] University of the West of England(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Erlangen-Nuremberg(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Solvability of superlinear fractional parabolic equations2022

    • Author(s)
      Fujishima Yohei、Hisa Kotaro、Ishige Kazuhiro、Laister Robert
    • Journal Title

      Journal of Evolution Equations

      Volume: 23 Issue: 1

    • DOI

      10.1007/s00028-022-00853-z

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Global in time solvability for a semilinear heat equation without the self-similar structure2022

    • Author(s)
      Y. Fujishima and N. Ioku
    • Journal Title

      Partial Differential Equations and Applications

      Volume: 3 Issue: 2

    • DOI

      10.1007/s42985-022-00158-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Initial traces and solvability of Cauchy problem to a semilinear parabolic system2021

    • Author(s)
      FUJISHIMA Yohei、ISHIGE Kazuhiro
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 73 Issue: 4 Pages: 1187-1219

    • DOI

      10.2969/jmsj/84728472

    • NAID

      130008106923

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Solvability of a Semilinear Heat Equation via a Quasi Scale Invariance2021

    • Author(s)
      Fujishima Yohei、Ioku Norisuke
    • Journal Title

      Geometric Properties for Parabolic and Elliptic PDE's

      Volume: - Pages: 79-101

    • DOI

      10.1007/978-3-030-73363-6_5

    • ISBN
      9783030733629, 9783030733636
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Finite speed propagation for parabolic quasiminimizers2020

    • Author(s)
      Fujishima Y.、Habermann J.
    • Journal Title

      Nonlinear Analysis

      Volume: 198 Pages: 111891-111891

    • DOI

      10.1016/j.na.2020.111891

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Blowing up solutions for nonlinear parabolic systems with unequal elliptic operators2020

    • Author(s)
      Y. Fujishima, K. Ishige
    • Journal Title

      J. Dynam. Differential Equations

      Volume: 32 Issue: 3 Pages: 1219-1231

    • DOI

      10.1007/s10884-019-09790-x

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Quasi self-similarity and its application to the global in time solvability of a superlinear heat equation2023

    • Author(s)
      藤嶋陽平
    • Organizer
      第14回名古屋微分方程式研究集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Quasi self-similarity and its application to the global in time solvability of a superlinear heat equation2022

    • Author(s)
      藤嶋陽平
    • Organizer
      鳥取PDE研究集会2022
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global in time solvability for a semilinear heat equation without the self-similar structure2022

    • Author(s)
      藤嶋陽平
    • Organizer
      Critical Exponent and Nonlinear Partial Differential Equations 2022
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Solvability for a semilinear heat equation without the self-similar structure2019

    • Author(s)
      Yohei Fujishima
    • Organizer
      VI Italian-Japanese workshop `Geometric Properties for Parabolic and Elliptic PDE's'
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2019-04-18   Modified: 2024-01-30  

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