安定成層勇剪流の乱流輸送機構 : 第1報, 二次元乱流の直接シミュレーション

概要

論文の詳細を見る
A turbulence transport mechanism of a stratified flow was studied analytically by using a third-order upwind difference method for the Navier-Stokes equation without any turbulence average modelling. A stably stratified shear flow was analyzed where two parallel streams of water with different densities moving at different velocities were merged at the entrance to the channel. Regular arrays of the cross-flow vortices and fluid mixing were calculated at the interface where the analytical grid transformation method was used for concentration of the mesh size at the interface without losing any discretization order. Non-dimensional distributions of density and velocity at a vertical cross section agreed with experimental data. Turbulent mass diffusivity became negative at the upper side of the mixing layer, where dissipation of buoyancy had a large effect.
社団法人日本機械学会の論文
1991-11-25