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2021 年度 実績報告書

Stochastic Model Optimization for Improving the Accuracy and Rapidity of Urban Airflow CFD Simulations

研究課題

研究課題/領域番号 20K14889
研究機関広島大学

研究代表者

シルザディ モハンマッドレザ  広島大学, 先進理工系科学研究科(工), 研究員 (40868733)

研究期間 (年度) 2020-04-01 – 2022-03-31
キーワードStochastic optimization / Turbulence mode / Urban airflow simulation / Accuracy improvement / CFD
研究実績の概要

In this research, a systematic calibration methodology is proposed for enhancing the accuracy of urban airflow simulations using computational fluid dynamics (CFD) models based on the Reynolds-averaged Navier-Stokes (RANS) equations. In the calibration process, high-quality data from different sources are used to define the validation metrics, which are then utilized as the objective function in a stochastic optimization solver to find optimal values for closure coefficients of the RANS turbulence model. For the high-quality data, wind tunnel experimental data and numerical simulation data by Large Eddy Simulation (LES) were used. The proposed calibration method is applied to different urban case studies, including an unstable atmospheric boundary layer (ABL) around a high-rise building, a sheltered cross-ventilated low-rise building, and a group of low-rise buildings located in a highly packed urban area. The calibration methodology was also implemented for a building shape optimization aiming to optimize the pedestrian-level wind environment (PLWE) around a high-rise building located in a real urban configuration. The significant advantage of using the obtained calibrated coefficients is observed over the existing coefficients embedded in CFD tools as well as the ones recommended by other calibration methods in the literature. Thus, this research proves the necessity of finding a group of customized optimum closure coefficients for RANS turbulence models suitable for a wide range of urban flow problems.

  • 研究成果

    (4件)

すべて 2021

すべて 雑誌論文 (4件) (うち国際共著 4件、 オープンアクセス 1件)

  • [雑誌論文] Wind tunnel measurement dataset of 3D turbulent flow around a group of generic buildings with and without a high-rise building2021

    • 著者名/発表者名
      Tominaga Yoshihide、Shirzadi Mohammadreza
    • 雑誌名

      Data in Brief

      巻: 39 ページ: 107504~107504

    • DOI

      10.1016/j.dib.2021.107504

    • オープンアクセス / 国際共著
  • [雑誌論文] Wind tunnel measurement of three-dimensional turbulent flow structures around a building group: Impact of high-rise buildings on pedestrian wind environment2021

    • 著者名/発表者名
      Tominaga Yoshihide、Shirzadi Mohammadreza
    • 雑誌名

      Building and Environment

      巻: 206 ページ: 108389~108389

    • DOI

      10.1016/j.buildenv.2021.108389

    • 国際共著
  • [雑誌論文] Multi-fidelity shape optimization methodology for pedestrian-level wind environment2021

    • 著者名/発表者名
      Shirzadi Mohammadreza、Tominaga Yoshihide
    • 雑誌名

      Building and Environment

      巻: 204 ページ: 108076~108076

    • DOI

      10.1016/j.buildenv.2021.108076

    • 国際共著
  • [雑誌論文] LES analysis of turbulent fluctuation in cross-ventilation flow in highly-dense urban areas2021

    • 著者名/発表者名
      Shirzadi Mohammadreza、Mirzaei Parham A.、Tominaga Yoshihide
    • 雑誌名

      Journal of Wind Engineering and Industrial Aerodynamics

      巻: 209 ページ: 104494~104494

    • DOI

      10.1016/j.jweia.2020.104494

    • 国際共著

URL: 

公開日: 2022-12-28  

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