二次元及び三次元RANSモデルによる浅水格子乱流の数値解析

• 木村 一郎

  松江工業高等専門学校 環境・建設工学科

• Ujittewaal W.S.J.

  Delft University of Tech., Faculty of Civil Eng. and Geosciences

• 細田 尚

  京都大学大学院 工学研究科

書誌事項

タイトル別名

• COMPUTATIONS OF SHALLOW GRID TURBULENCE USING 2D AND 3D RANS MODELS

抄録

Grid turbulence is one of most fundamental turbulence phenomena because it dose not have a velocity distribution in the main flow. This paper describes the computations of grid turbulence in shallow flows in open channels. Since the shallow grid turbulence is bounded by a solid bottom and a free surface, its fundamental turbulence structures are completely different from the three-dimensional grid turbulence. The vertical confinement of the flow suppresses the three-dimensionality and attains strongly two-dimensional features with inverse cascade of turbulence energy from small scale toward large-scale structures due to vortex merging. 2D depth averaged models and 3D models with linear and non-linear constitutive equations are applied to a shallow grid turbulence and the results are discussed through the comparison with the results of laboratory tests performed by Uijttewaal and Jirka (2003). In 2D computations, a modified non-linear 0-equation model could capture the fundamental aspects of flow phenomena including inverse cascading. In 3D models, an artificial disturbance at inlet boundary is necessary to generate inverse cascade.

収録刊行物

• 水工学論文集

  水工学論文集 51 799-804, 2007

  公益社団法人 土木学会

キーワード

• Shallow flows
• Grid turbulence
• RANS
• Depth-averaged model
• 3D computations
• Non-linear k-εmodel
• Non-linear 0-equation model

詳細情報

• CRID: 1390001205170571648
• NII論文ID: 130003842548
• DOI: 10.2208/prohe.51.799
• ISSN: 18849172
• ISSN: 09167374
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可