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Explicit method for unsteady fluid dynamics simulation

Research Project

Project/Area Number 21K18770
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 23:Architecture, building engineering, and related fields
Research InstitutionKyushu University

Principal Investigator

Ikegaya Naoki  九州大学, 総合理工学研究院, 准教授 (70628213)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywords陽的解法 / 数値流体解析 / 屋外風環境 / キャピティー流れ / 実街区 / 陽的解放 / 建物周辺気流
Outline of Research at the Start

建築を取り巻くあらゆる空間スケールにおける数値流体計算の計算負荷は大きい.その原因のひとつは,非圧縮性仮定によるポアソン方程式の反復計算にあるが, 現行では代数計算効率化,大規模並列化,または計算機性向上を主とするもので,非圧縮性流体の解析アルゴリズムそのものを革新するという発想は観られない.そこで,本課題では,計算格子間を移動する仮想粒子の概念を導入し,新しい方程式体系による陽的解析手法を提案する.屋内外空気流動の非定常流体シミュレーションの普及を最終目標として,繰り返し計算のない陽的解法を提案し,様々な建物周辺流れを対象とした陽的非定常シミュレーションの有用性を提示する.

Outline of Final Research Achievements

The velocity fields around buildings are solved using computational fluid dynamics approaches; however, unsteady simulations require huge numerical demands. Therefore, this research proposed a new calculation approach explicated determine the velocity field based on Eulerian governing equations. First, a new concept to consider the virtual particles is introduced to theoretically determine the propagation velocity of the sound wave and pressure values based on the numerical grid system. Second, the velocity fields were simulated using the proposed method and conventional method relaying on implicit numerical approaches. The results clearly showed that proposed method can accurately reproduce the velocity field with shorter numerical simulation time. The study, therefore, was able to achieve the research aims targeted to propose a new methodology which theoretically reasonable to determine the pressure fields with less computational costs.

Academic Significance and Societal Importance of the Research Achievements

計算負荷軽減法には,代数計算効率や計算機性能の向上などの計算機科学的な方法が執られてきたが,本研究課題の遂行により,解析アルゴリズムを抜本的に改善することができた.これにより,長年適用されてきた非圧縮性流体の解析アルゴリズムを見直し,定常計算から非定常計算への転換のボトルネックを解決する足がかりを提供することができ,陽的解法の実用化に向けた大きなブレークスルーをもたらすことができたと考えられる.また,提案手法の数値流体力学的な解釈だけではなく,明確な理論展開を行ったことにより,当該分野だけではなく,流体力学の発展に貢献できる成果を残した.

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results)

  • [Int'l Joint Research] Universiti Teknologi MARA(マレーシア)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Numerical Investigation of Flow and Dispersion over Two-Dimensional Semi-Open Street Canyon2023

    • Author(s)
      Muhammad Fatih Ibrahim、Mohd Faizal Mohamad、Naoki Ikegaya、Azli Abd Razak
    • Journal Title

      CFD Letters

      Volume: 15 Issue: 2 Pages: 53-70

    • DOI

      10.37934/cfdl.15.2.5370

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Effect of protruding eave on the turbulence structures over two-dimensional semi-open street canyon2023

    • Author(s)
      Alwi Abdillah、Mohamad Mohd Faizal、Ikegaya Naoki、Razak Azli Abd
    • Journal Title

      Building and Environment

      Volume: 228 Pages: 109921-109921

    • DOI

      10.1016/j.buildenv.2022.109921

    • Related Report
      2022 Annual Research Report
  • [Journal Article] EFFECT OF MOMENTUM PROVISION IN COMPUTATIONAL FLUID DYNAMICS ON TURBULENT STATISTICS IN URBAN BOUNDARY LAYER2022

    • Author(s)
      SANEMITSU Toshiki、IKEGAYA Naoki、HIROSE Chiyoko、TANIMOTO Jun、HAGISHIMA Aya
    • Journal Title

      Journal of Environmental Engineering (Transactions of AIJ)

      Volume: 87 Issue: 792 Pages: 145-156

    • DOI

      10.3130/aije.87.145

    • NAID

      130008150439

    • ISSN
      1348-0685, 1881-817X
    • Year and Date
      2022-02-01
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] COMPUTATIONAL FLUID DYNAMICS FOR CROSS-VENTILATED AIRFLOW IN AN URBAN BUILDING2022

    • Author(s)
      HIROSE Chiyoko、IKEGAYA Naoki、HAGISHIMA Aya、TANIMOTO Jun
    • Journal Title

      Journal of Environmental Engineering (Transactions of AIJ)

      Volume: 87 Issue: 791 Pages: 19-28

    • DOI

      10.3130/aije.87.19

    • NAID

      130008139171

    • ISSN
      1348-0685, 1881-817X
    • Year and Date
      2022-01-01
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Age of air, purging flow rate, and net escape velocity in a cross-ventilation model sheltered by urban-like blocks using LES2022

    • Author(s)
      Fernandez Ken Bryan、Ikegaya Naoki、Ito Kazuhide、Chen Qingyang
    • Journal Title

      Building and Environment

      Volume: 226 Pages: 109759-109759

    • DOI

      10.1016/j.buildenv.2022.109759

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Modelling probability density functions based on the Gram?Charlier series with higher-order statistics: Theoretical derivation and application2022

    • Author(s)
      Wang Wei、Seta Koki、Ikegaya Naoki
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics

      Volume: 231 Pages: 105227-105227

    • DOI

      10.1016/j.jweia.2022.105227

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Computational fluid dynamics for cross‐ventilated airflow in an urban building2022

    • Author(s)
      Hirose Chiyoko、Ikegaya Naoki、Hagishima Aya、Tanimoto Jun
    • Journal Title

      JAPAN ARCHITECTURAL REVIEW

      Volume: 6 Issue: 1 Pages: 1-9

    • DOI

      10.1002/2475-8876.12312

    • NAID

      130008139171

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Wind-tunnel estimation of mean and turbulent wind speeds within canopy layer for urban campus2022

    • Author(s)
      H'ng Yin Mun、Ikegaya Naoki、Zaki Sheikh Ahmad、Hagishima Aya、Mohammad Ahmad Faiz
    • Journal Title

      Urban Climate

      Volume: 41 Pages: 101064-101064

    • DOI

      10.1016/j.uclim.2021.101064

    • Related Report
      2021 Research-status Report
  • [Journal Article] Momentum-Flux Determination for Boundary Layers with Sufficient Fetch Based on Integral Equations2021

    • Author(s)
      Ikegaya Naoki
    • Journal Title

      Boundary-Layer Meteorology

      Volume: 182 Issue: 2 Pages: 225-250

    • DOI

      10.1007/s10546-021-00651-z

    • Related Report
      2021 Research-status Report
  • [Journal Article] Consideration of artificial compressibility for explicit computational fluid dynamics simulation2021

    • Author(s)
      Nagata, K., Ikegaya, N., Tanimoto, J.
    • Journal Title

      Journal of Computational Physics

      Volume: 443 Pages: 110524-110524

    • DOI

      10.1016/j.jcp.2021.110524

    • Related Report
      2021 Research-status Report
  • [Journal Article] Large-eddy simulation of flow around an isolated building: A step-by-step analysis of influencing factors on turbulent statistics2021

    • Author(s)
      Okaze Tsubasa、Kikumoto Hideki、Ono Hiroki、Imano Masashi、Ikegaya Naoki、Hasama Takamasa、Nakao Keisuke、Kishida Takeshi、Tabata Yuichi、Nakajima Keigo、Yoshie Ryuichiro、Tominaga Yoshihide
    • Journal Title

      Building and Environment

      Volume: 202 Pages: 108021-108021

    • DOI

      10.1016/j.buildenv.2021.108021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Indoor airflow and thermal comfort in a cross-ventilated building within an urban-like block array using large-eddy simulations2021

    • Author(s)
      Hirose C.、Ikegaya N.、Hagishima A.、Tanimoto J.
    • Journal Title

      Building and Environment

      Volume: 196 Pages: 107811-107811

    • DOI

      10.1016/j.buildenv.2021.107811

    • Related Report
      2021 Research-status Report
    • Peer Reviewed

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Published: 2021-07-13   Modified: 2024-01-30  

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