縦渦による壁面噴流の制御 : レイノルズ応力分布と渦度輸送方程式の評価

抄録

The Reynolds stress distributions and evolution of production terms in the vorticity transport equation have been investigated experimentally in a stronger wall jet managed with an embedded streamwise vortex. In the present three-dimensional flow field, the mean velocity gradient ∂U/∂y and ∂U/∂z have still primary importance to quantitative feature, such as the maximum and minimum, of the Reynolds shear stresses -uv_- and -uw_-, respectively. A possible explanation by means of spanwise oscillation of the streamwise vortex is proposed for non-isotropy of the Reynolds stresses. The non-isotropic and non-uniform distributions of the Reynolds stresses play a dominant role on the decay of the streamwise vortex. Comparisons with results in turbulent boundary layers are made in terms of the non-isotropy of the Reynolds stresses and asymmetry in spatial distributions of -uv_- and -uw_-.