A231 チャネル乱流中でのラグランジアン積分時間スケール

概要

論文の詳細を見る
Lagrangian integral time scale and relationship between Lagrangian and Eulerian integral time scales have been investigated using direct numerical simualtion of a low Reynolds number turbulent channel flow. Computation was conducted at Reynolds number of 100,based on half channel height and friction velocity. Lagrangian statistics were computed from 1000 fluid particles initially at the same specified distance from the wall. Lagrangian integral time scale was found to be a finite value at the wall and to equal fixed Eulerian integral time scale. The ratio of the Lagrangian to Eulerian time scales of wall-normal velocity is monotonically increasing with distance from the wall and fairly constant in the core region of channel. The value is of the same order as the values previously found in measumrement and thoery.
日本流体力学会の論文
2002-07-23