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

Elucidation of the mechanism of scalar transport in multi-scale grid turbulence and innovative mixing enhancement

Research Project

Project/Area Number 19K14891
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionNagasaki University

Principal Investigator

Kitamura Takuya  長崎大学, 工学研究科, 助教 (30794648)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords乱流 / スカラー輸送 / 多目的最適化 / 直接数値計算 / 大規模直接数値計算 / エネルギー散逸率 / 固有値直交分解 / クロージャー理論 / 機械学習 / 粒子拡散 / 最適化
Outline of Research at the Start

初期条件や境界条件が異なる熱や濃度の混合促進および物質拡散を目的とした多目的最適化手法による大小様々な格子から構成されるマルチスケール格子形状の最適化を行う.
データマイニングや機械学習といった情報技術や理論解析を用いて,物質拡散および混合促進と格子形状や流れ場の関係性評価を行い,その関係性を整理する.
また,粒子の分散過程に基づいたラグランジュ的統一解析により,乱流輸送現象のメカニズム解明を試みる.

Outline of Final Research Achievements

We have developed an algorithm for generate arbitrary grid geometries for the purpose which archives mixing enhancement and pressure reduction in multi-scale grid turbulence.
We performed direct numerical simulations for various grid geometries and we found by means of data mining the trade-off relationship between mixing enhancement and pressure reduction. Our results indicate that grid configuration which increases the turbulent Reynolds number is important to promote mixing enhancement, while a reduction of grid solidity improves the reduction of pressure drop.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は,機械学習などの情報技術を利用し,異なる形状のマルチスケール格子により生成された流れ場とスカラー輸送の関係性を整理し,乱流の持つ輸送能力の本質に迫ることである.
混合促進や圧力損失低減が可能となる格子形状の探索は,高性能混合デバイスや低圧力損失オリフィスなどの工業装置の開発といった社会的意義を有す.

Report

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

    (10 results)

All 2022 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Spectral theory of passive scalar with mean scalar gradient2021

    • Author(s)
      Takuya Kitamura
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 923

    • DOI

      10.1017/jfm.2021.559

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constant-energetics control-based forcing methods in isotropic helical turbulence2021

    • Author(s)
      Kitamura Takuya
    • Journal Title

      Physical Review Fluids

      Volume: 6 Issue: 4

    • DOI

      10.1103/physrevfluids.6.044608

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Single-time Markovianized spectral closure in fluid turbulence2020

    • Author(s)
      Kitamura Takuya
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 898

    • DOI

      10.1017/jfm.2020.415

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 一様等方性乱流のよどみ点の検出2022

    • Author(s)
      鳥飼 凌太郎,北村 拓也
    • Organizer
      九州学生会第53回学生員卒業研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 低圧力旋回渦による流れの可視化2022

    • Author(s)
      野上 久哉,北村 拓也
    • Organizer
      九州学生会第53回学生員卒業研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高混合性能を実現するための乱流格子作成の試み2021

    • Author(s)
      北村 拓也,下山 幸治
    • Organizer
      日本機械学会年次2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 混合促進に向けた乱流格子の形状最適化2020

    • Author(s)
      北村拓也
    • Organizer
      日本機械学会年次
    • Related Report
      2020 Research-status Report
  • [Presentation] multi-objective optimization of multiscale grid using deep learning2020

    • Author(s)
      Takuya Kitamura, Koji Shimoyama
    • Organizer
      17th International conference on flow dynamics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高レイノルズ数流れを目的とするマルチスケール格子の形状最適化2019

    • Author(s)
      北村拓也
    • Organizer
      日本機械学会 流体工学部門2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 小さい格子の乱流への影響とその最適配置2019

    • Author(s)
      北村拓也
    • Organizer
      第33回数値流体力学シンポジウム
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi