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Development of topology optimization for a transient state for the structural designs of fluid flow cloaks

Research Project

Project/Area Number 18K19781
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 60:Information science, computer engineering, and related fields
Research InstitutionShinshu University

Principal Investigator

YOSHINO Masato  信州大学, 学術研究院工学系, 教授 (00324228)

Co-Investigator(Kenkyū-buntansha) 藤井 雅留太  信州大学, 学術研究院工学系, 准教授 (90569344)
鈴木 康祐  信州大学, 学術研究院工学系, 准教授 (10735179)
秋本 洋平  筑波大学, システム情報系, 准教授 (20709654)
Project Period (FY) 2018-06-29 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords流体クローク / 埋め込み境界-格子ボルツマン法 / トポロジー最適化 / 共分散行列適応進化戦略 / レベルセット法 / 格子ボルツマン法 / 埋め込み境界 / 埋め込み境界-格子ボルツマン法 / 流体メタデバイス
Outline of Final Research Achievements

The objective of this study is to develop a design method for the creation of a fluid cloak that can be realized by completely controlling the fluid around the obstacle and reducing the turbulence of the flow due to the obstacle to zero. Topology optimization for non-stationary problems was developed using the level set method as a structure representation method and CMA-ES as a solution search method for optimized structures. While such topology optimization requires sensitivity analysis going back in time, the topology optimization developed in this study does not require such cumbersome sensitivity analysis and does not require trial and error such as initial estimation even for multimodal optimization problems with many local optimal solutions with poor performance.

Academic Significance and Societal Importance of the Research Achievements

障害物により流体の通過することのできる断面積が減るために,流量の保存則から,クロークされる障害物周辺では流速が速くならざるおえない.本研究の流体クロークの評価値は障害物がない流れ場と障害物がクロークされた流れ場の差を最小化し,クロークがない場合の目的関数値を1とする無次元化をおこなった.障害物周りに流体クロークの構造を設定することで,障害物のみ場合よりもさらに周辺の流速が上昇し,目的関数が1を下回ることが困難であった.これらは,本研究の問題設定においては流体クロークの設計と実現が,物理的に解決が困難であることを示唆しており,障害物がない場合の流れ場の完全な再現は困難であることが明らかになった.

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 2019 2018

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (4 results) Book (3 results)

  • [Journal Article] Local force calculations by an improved stress tensor discontinuity-based immersed boundary-lattice Boltzmann method2021

    • Author(s)
      Suzuki Kosuke, Ishizaki Kou, Yoshino Masato
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 4 Pages: 047104-047104

    • DOI

      10.1063/5.0044268

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Topology optimization for incompressible viscous fluid flow using the lattice kinetic scheme2021

    • Author(s)
      Xie Suqiong, Yaji Kentaro, Takahashi Toru, Isakari Hiroshi, Yoshino Masato, Matsumoto Toshiro
    • Journal Title

      Computers and Mathematics with Applications

      Volume: 97 Pages: 251-266

    • DOI

      10.1016/j.camwa.2021.05.032

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 熱を考慮した埋め込み境界-格子ボルツマン法による二次元攪拌問題の熱流動解析2019

    • Author(s)
      黒岩拓矢,吉野正人,鈴木康祐
    • Journal Title

      計算数理工学論文集

      Volume: 19 Pages: 7-12

    • NAID

      40022338116

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 熱を考慮した埋め込み境界-格子ボルツマン法による三次元ダクト内の氷スラリー熱流動解析2020

    • Author(s)
      黒岩拓矢,鈴木康祐,吉野正人
    • Organizer
      TOKAI ENGINEERING COMPLEX 2020 (TEC20) 東海支部第69期総会・講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 熱を考慮した埋め込み境界-格子ボルツマン法の正方形ダクト内における氷スラリー熱流動問題への適用2019

    • Author(s)
      黒岩拓矢,鈴木康祐,吉野正人
    • Organizer
      第56回伝熱シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 熱を考慮した埋め込み境界-格子ボルツマン法を用いた正方形ダクト内における氷スラリーの熱流動解析2019

    • Author(s)
      黒岩拓矢,吉野正人,鈴木康祐
    • Organizer
      第33回数値流体力学シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 応力テンソルの不連続条件を用いた埋め込み境界-格子ボルツマン法の改良2018

    • Author(s)
      鈴木康祐,吉野正人
    • Organizer
      第32回数値流体力学シンポジウム(東京都港区)
    • Related Report
      2018 Research-status Report
  • [Book] メタマテリアルの設計、作製と新材料、デバイス開発への応用2022

    • Author(s)
      執筆者:54名、技術情報協会
    • Total Pages
      508
    • Publisher
      技術情報協会
    • ISBN
      9784861048760
    • Related Report
      2021 Annual Research Report
  • [Book] An Introduction to the Lattice Boltzmann Method: A Numerical Method for Complex Boundary and Moving Boundary Flows2021

    • Author(s)
      Takaji Inamuro, Masato Yoshino, Kosuke Suzuki
    • Total Pages
      172
    • Publisher
      World Scientific Publishing Co. Ltd.
    • ISBN
      9789811240515
    • Related Report
      2021 Annual Research Report
  • [Book] 格子ボルツマン法入門2020

    • Author(s)
      稲室隆二,吉野正人,鈴木康祐
    • Total Pages
      176
    • Publisher
      丸善出版
    • ISBN
      9784621304761
    • Related Report
      2019 Research-status Report

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Published: 2018-07-25   Modified: 2023-01-30  

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