粗度要素の抵抗および体積変化を考慮したκ-εモデルによる乱流境界層の数値計算

Abstract

Turbulent flows in and above the roughness elements are studied using a refined κ-ε turbnlence model. The model is derived from the Navier Stokes equations by the time space averaging operations in consideration of the drag and volume change of roughness elements. The coefficients introduced in the model are examined by the experimental data. The drag coefficient and the length scale which show good agreements between the calculations and the experimental results were obtained for some roughness configulations.