ＬＥＳによる粗面上の乱流境界層の数値計算

• 丸山 敬

  京都大学防災研究所

書誌事項

タイトル別名

• NUMERICAL CALCULATION OF TURBULENT BOUNDARY LAYER OVER ROUGH SURFACE USING LARGE EDDY SIMULATION

抄録

The demand of numerical prediction of wind flow over rough surfaces such as urban areas is increasing. Reproduction of the roughness configuration in the mesh discretization is a direct way for numerical calculations. However, the roughnesses near the ground such as buildings or houses are complicated. Therefore the reproduction increases the computational load and can cost a lot of time and money. In order to reduce this, we applied a filtering operation, that is an averaging in a space containing solid obstacles, to the Navier-Stokes equations and derived filtered equations with a subgrid scale turbulent modeling for the Large Eddy Simulation. Consequently, we can take the obstacles to be porous media distributed uniformly in the mesh. The configuration of the obstacles does not need to be reproduced any further. We can calculate the space-averaged property of flows with coarse meshes and a reduced computational load. We present some calculations of turbulent boundary layer over a rough surface. The performance and effectiveness of the calculation method are examined by comparing with the measured data by wind tunnel experiments.

収録刊行物

• 風工学シンポジウム論文集

  風工学シンポジウム論文集 18 (0), 000016-000016, 2005

  一般社団法人 日本風工学会

キーワード

• LES
• 乱流境界層
• 粗面
• 数値シミュレーション

詳細情報

• CRID: 1390282680569957504
• NII論文ID: 130004644224
• DOI: 10.14887/kazekosymp.18.0.000016.0
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可