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Theoretical study on identifying occurrence mechanisms of rare wind events within urban canopy layer

Research Project

Project/Area Number 17KK0117
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Architectural environment/Equipment
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) 2018 – 2020
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
Keywords境界層 / 都市キャノピー / 運動量フラックス / 乱流構造 / 輸送係数 / 年キャノピー / 植生キャノピー / 歩行者空間 / 低頻度高リスク
Outline of Final Research Achievements

In this study, we clarify the fundamental factors determining low frequency but high-risk wind gust phenomena occurring within an urban boundary layer. Based on the base theme for this study, we had opportunities to work with two international researchers dealing with turbulent phenomena within atmospheric boundary layers. In commonwealth Scientific Industrial Research Organisation, we theoretically derived an integral equation explaining the momentum budget mechanics which help understand the key reason of gust events within an urban boundary layer. In National Center for Atmospheric Research, we thoroughly reviewed previous transfer model and our results to summarize the relationship between the transfer coefficient of momentum and scalar quantities and considering length scale. We concluded that our study contributes for establishing the models for gust predictions and transfer coefficients.

Academic Significance and Societal Importance of the Research Achievements

本課題は,都市乱流境界層を対象として,都市域における低頻度高リスク環境の発生機構の解明および都市乱流境界層における統計量普遍則の追求を試みたものである.応用的かつ実学的な研究が先行する日本のアカデミアに対して,本課題による国際共同研究を実施したことによって,先行研究として進んでいる植生キャノピーの知見や屋外実験における物質輸送係数推定の結果から,理論的論考よるモデリングに資する基礎的知見を得ることができた.特に人々や建物などか関連する建築環境の分野のよう応用研究が重要視されつつある分野に対して,流体力学的な基礎的知見を導入できたことの分野に対する波及効果は極めて大きなものであると考えている.

Report

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

    (24 results)

All 2021 2020 2019 2018

All Int'l Joint Research (2 results) Journal Article (14 results) (of which Peer Reviewed: 5 results) Presentation (8 results)

  • [Int'l Joint Research] National Center for Atmospheric Research(The United States of Ameria)2020

    • Year and Date
      2020-01-01
    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Commonwealth Scientific and Industrial Research Organization(Australia)2019

    • Year and Date
      2019-04-01
    • Related Report
      2020 Annual Research Report
  • [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
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Estimation Method for Mass Transfer Coefficient Distribution using Near-Infrared Spectroscopy2021

    • Author(s)
      Eshima Hiroshi、Ikegaya Naoki、Yasumasu Takuya、Hagishima Aya、Tanimoto Jun
    • Journal Title

      Evergreen

      Volume: 8 Issue: 1 Pages: 193-197

    • DOI

      10.5109/4372278

    • NAID

      120007000980

    • ISSN
      2189-0420, 2432-5953
    • Related Report
      2020 Annual Research Report
  • [Journal Article] Turbulence Effect of Urban-Canopy Flow on Indoor Velocity Fields under Sheltered and Cross-Ventilation Conditions2021

    • Author(s)
      Mohammad Ahmad Faiz、Ikegaya Naoki、Hikizu Ryo、Zaki Sheikh Ahmad
    • Journal Title

      Sustainability

      Volume: 13 Issue: 2 Pages: 586-586

    • DOI

      10.3390/su13020586

    • Related Report
      2020 Annual Research Report
  • [Journal Article] BENCHMARK TEST OF FLOW FIELD AROUND A 1:1:2 SHAPED BUILDING MODEL USING LES:2020

    • 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

      AIJ Journal of Technology and Design

      Volume: 26 Issue: 62 Pages: 179-184

    • DOI

      10.3130/aijt.26.179

    • NAID

      130007800659

    • ISSN
      1341-9463, 1881-8188
    • Year and Date
      2020-02-20
    • Related Report
      2019 Research-status Report
  • [Journal Article] Numerical simulation for cross-ventilation flow of generic block sheltered by urban-like block array2020

    • Author(s)
      Adachi Y.、Ikegaya N.、Satonaka H.、Hagishima A.
    • Journal Title

      Building and Environment

      Volume: 185 Pages: 107174-107174

    • DOI

      10.1016/j.buildenv.2020.107174

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Numerical simulation of the effects of secondary roughness in the form of extension to arrays of terraced houses on pedestrian wind2020

    • Author(s)
      Salim Sheikh Ahmad Zaki Shaikh、Razali Mohamad Nor Hafidz Arif、Ikegaya Naoki、Mohammad Ahmad Faiz、Ali Mohamed Sukri Mat
    • Journal Title

      Science and Technology for the Built Environment

      Volume: 26 Issue: 7 Pages: 928-940

    • DOI

      10.1080/23744731.2020.1735860

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
  • [Journal Article] Evaluation of exceeding wind speed at a pedestrian level around a 1:1:2 isolated block model2020

    • Author(s)
      Ikegaya N.、Kawaminami T.、Okaze T.、Hagishima A.
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics

      Volume: 201 Pages: 104193-104193

    • DOI

      10.1016/j.jweia.2020.104193

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Outdoor measurements of relationship between canopy flow and wall pressure distributions of a block within urban-like block array2020

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

      Building and Environment

      Volume: 176 Pages: 106881-106881

    • DOI

      10.1016/j.buildenv.2020.106881

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Effect of the numerical viscosity on reproduction of mean and turbulent flow fields in the case of a 1:1:2 single block model2019

    • Author(s)
      Ikegaya N.、Okaze T.、Kikumoto H.、Imano M.、Ono H.、Tominaga Y.
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics

      Volume: 191 Pages: 279-296

    • DOI

      10.1016/j.jweia.2019.06.013

    • Related Report
      2019 Research-status Report
  • [Journal Article] Outdoor measurement of wall pressure on cubical scale model affected by atmospheric turbulent flow2019

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

      Building and Environment

      Volume: 160 Pages: 106170-106170

    • DOI

      10.1016/j.buildenv.2019.106170

    • Related Report
      2019 Research-status Report
  • [Journal Article] Time-resolved particle image velocimetry for cross-ventilation flow of generic block sheltered by urban-like block arrays2019

    • Author(s)
      Ikegaya N.、Hasegawa S.、Hagishima A.
    • Journal Title

      Building and Environment

      Volume: 147 Pages: 132-145

    • DOI

      10.1016/j.buildenv.2018.10.015

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Velocity and scalar concentrations with low occurrence frequencies within urban canopy regions in a neutrally stable shear flow over simplified urban arrays2018

    • Author(s)
      Kawaminami T.、Ikegaya N.、Hagishima A.、Tanimoto J.
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics

      Volume: 182 Pages: 286-294

    • DOI

      10.1016/j.jweia.2018.09.024

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] A new semi-empirical model for estimating the drag coefficient of the vertical random staggered arrays using LES2018

    • Author(s)
      Mohammad Ahmad Faiz、Zaki Sheikh Ahmad、Ikegaya Naoki、Hagishima Aya、Ali Mohamed Sukri Mat
    • Journal Title

      Journal of Wind Engineering and Industrial Aerodynamics

      Volume: 180 Pages: 191-200

    • DOI

      10.1016/j.jweia.2018.08.003

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Coupled Simulations of Indoor-Outdoor Flow Fields for Cross-Ventilation of a Building in a Simplified Urban Array2018

    • Author(s)
      Murakami Yuki、Ikegaya Naoki、Hagishima Aya、Tanimoto Jun
    • Journal Title

      Atmosphere

      Volume: 9 Issue: 6 Pages: 217-217

    • DOI

      10.3390/atmos9060217

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 都市乱流境界層の数値流体解析と風洞実験における駆動条件の違いに関する考察2020

    • Author(s)
      池谷直樹,真光俊樹
    • Organizer
      第34回数値流体力学シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] Development of estimation method for convective heat transfer coefficient distribution using near-infrared spectroscopy2019

    • Author(s)
      Eshima H., Yasumasu T., Ikegaya N., Hagishima A., Tanimoto J.,
    • Organizer
      The 11th International Meeting on Advances in ThermoFluids (IMAT2019)
    • Related Report
      2019 Research-status Report
  • [Presentation] Unsteady numerical simulation of indoor air of a building within an urban-like boundary layer2019

    • Author(s)
      Adachi Y., Satonaka H., Ikegaya N., Hagishima A., Tanimoto J.
    • Organizer
      The 11th International Meeting on Advances in ThermoFluids (IMAT2019)
    • Related Report
      2019 Research-status Report
  • [Presentation] Investigating statistics of peak wind speed around an isolated building model via large-eddy simulation2019

    • Author(s)
      Kikumoto H., Okaze T ., Ikegaya N., T ominaga Y .
    • Organizer
      The 15th International conference on wind engineering
    • Related Report
      2019 Research-status Report
  • [Presentation] Framework of AIJ guidelines of pedestrian wind environment for practrical applications of large-eddy simulations2019

    • Author(s)
      Okaze T., Kikumoto H., Ono H., Ikegaya N., Natao K., Kishida T., Imano M., Hasama T., Tabata Y., Nagajima K., Tominaga Y.
    • Organizer
      The 15th International conference on wind engineering
    • Related Report
      2019 Research-status Report
  • [Presentation] LESによる市街地風環境予測のためのガイドライン策定に向けて,その6 LESによる1:1:2単体建物周辺流れの乱流スペクトル再現性に関す る考察2018

    • Author(s)
      池谷直樹
    • Organizer
      日本建築学会学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 都市キャノピー内の建物を対象とした通風換気時の室内流れ計測2018

    • Author(s)
      池谷直樹
    • Organizer
      日本流体力学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Effect of advection scheme for large-eddy simulation on turbulent flow fields around an isolated block model2018

    • Author(s)
      Naoki Ikegaya
    • Organizer
      Computational Wind Engineering
    • Related Report
      2018 Research-status Report

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Published: 2018-01-25   Modified: 2022-01-27  

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