Comparison between LES and standard k-ε model for flow within and above urban canyon under various thermal stratification

• NAKAJIMA Keigo

  東京大学大学院　工学系研究科

• OOKA Ryozo

  東京大学生産技術研究所　人間・社会系部門

• KIKUMOTO Hideki

  東京大学生産技術研究所　人間・社会系部門

Bibliographic Information

Other Title

• 様々な温度成層条件下の都市キャニオン内外におけるLESと標準k-εモデルの比較
• サマザマ ナ オンド セイソウ ジョウケン カ ノ トシ キャニオン ナイガイ ニ オケル LES ト ヒョウジュン k-eモデル ノ ヒカク

Abstract

Computational fluid dynamics （CFD） analysis using large-eddy simulation （LES） and standard k-ε modelThe results of LES and k-ε were compared with the wind tunnel experiment to investigate the prediction accuracy of CFD analysis. LES agreed with the wind tunnel experiment for the mean wind velocity and mean temperature. k-ε failed to reproduce the spatial distribution of the mean wind velocity and mean temperature within the urban canyon in unstable case. LES and k-ε agreed well with the wind tunnel experiment for the turbulent kinetic energy in stable case, although they underestimated it within the urban canyon in unstable case. k-ε also underestimated the Reynolds stress <u₁'u₃'> and turbulent heat flux <u₃'T'> within the urban canyon in unstable and stable cases. It is thought that the prediction accuracy of k-ε decreases because k-εunderestimates the exchange of momentum and heat within and above the urban canyon compared with LES and the wind tunnel experiment.

Journal

• SEISAN KENKYU

  SEISAN KENKYU 68 (1), 35-41, 2016

  Institute of Industrial Science The University of Tokyo

Details

• CRID: 1390001204062741888
• NII Article ID: 130005121679
• NII Book ID: AN00127075
• DOI: 10.11188/seisankenkyu.68.35
• ISSN: 18812058
• ISSN: 0037105X
• NDL BIB ID: 027090954
• Web Site: http://id.ndl.go.jp/bib/027090954
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027090954
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed