Implementation of the RANS-based CFD method reproducing organized unsteady flow fluctuation in wind environment around buildings

• Project/Area Number: 25420616
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Architectural environment/Equipment
• Research Institution: Niigata Institute of Technology
• Principal Investigator: Tominaga Yoshihide 新潟工科大学, 工学部, 教授 (00278079)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 市街地風環境 / 非定常変動 / CFD / RANS / 風環境 / 市街地 / 汚染質拡散 / ＣＦＤ / ＲＡＮＳ / 非定常 / 建物周辺気流 / 組織的非定常変動 / 乱流変動 / URANS / 風洞実験

Outline of Final Research Achievements

The performance of the unsteady Reynolds-averaged Navier-Stokes (URANS) turbulence modeling of the flow field around an isolated building was examined. The unsteady fluctuation behind the building was successfully reproduced by URANS computation. The URANS computation successfully contributed to the reproduction of a certain part of the large-scale unsteady flow patterns around the building, and enabled more accurate prediction of the velocity distributions behind the building compared to the steady-RANS (SRANS) computation. The URANS simulations also yielded larger estimates of the concentration diffusions behind the buildings than SRANS and improved the accuracy of the estimation of the mean concentration.

Research Products

• [Int'l Joint Research] コンコルディア大学(カナダ)
• [Journal Article] Flow around a high-rise building using steady and unsteady RANS CFD: Effect of large-scale fluctuations on the velocity statistics (2015)
  • Author(s): Yoshihide Tominaga
  • Journal Title: Journal of Wind Engineering and Industrial Aerodynamics Volume: 142 Pages: 93-103
  • DOI: 10.1016/j.jweia.2015.03.013
  • Peer Reviewed
• [Journal Article] Air flow around isolated gable-roof buildings with different roof pitches: Wind tunnel experiments and CFD simulations (2015)
  • Author(s): Yoshihide Tominaga，Shin-ichi Akabayashi, Takuya Kitahara, Yuki Arinami
  • Journal Title: Building and Environment Volume: 84 Pages: 204-213
  • DOI: 10.1016/j.buildenv.2014.11.012
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] CFDに基づく市街地の汚染質・熱拡散の予測手法に関する研究：非定常RANS解析の汚染質拡散への適用 (2016)
  • Author(s): 富永禎秀
  • Organizer: 日本建築学会大会（九州）学術講演会
  • Place of Presentation: 福岡大学
  • Year and Date: 2016-08-24
• [Presentation] CFD simulations of near-field dispersion around isolated cubical buildings: Evaluation of URANS (2016)
  • Author(s): Yoshihide Tominaga, Ted Stathopoulos
  • Organizer: 8th International Colloquium on Bluff Body Aerodynamics and Applications (BBAA VIII)
  • Place of Presentation: Northeastern University, Boston, Massachusetts, USA
  • Year and Date: 2016-06-07
  • Int'l Joint Research
• [Presentation] CFD simulation of flowfield around a high-rise building: Model evaluation of URANS (2014)
  • Author(s): Yoshihide Tominaga
  • Organizer: 6th International Symposium on Computational Wind Engineering (CWE2014)
  • Place of Presentation: Hamburg, Germany
• [Remarks] 都市環境・風工学研究室（富永研究室）ホームページ
  • URL: http://www.ytomi.net/tomilab/
• [Remarks] 新潟工科大学（建築学科） 都市環境・風工学研究室 富永研究室
  • URL: http://www.ytomi.net/tomilab/