(A) study on parameters affecting the structure of the turbulent pane jet

Abstract

The effect of the initial conditions on the evolution of the turbulent plane jet are investigated by the k-$\varepsilon$ and the Reynolds stress models. k-$\varepsilon$ model is used to predict the change of the structure of the jet depending on the change of the time scale (k/$\varepsilon$), and Reynolds stress model the change of the structure for the intensities $\overline{u^2}$ $\overline{v^2}$. Degree of the dependency of the structure of the jet on the initial conditions are evaluated by the change of the spreading rate, the turbulent core length, variation of the turbulent intensities along the centerline of the jet. In k-$\varepsilon$ model, as the characteristic time scale increases, the turbulent core length decreases and the rate angle is nearly constant but the spread increases. In Reynolds stress model, the initial turbulent intensity increases, the rate angle is nearly constant, the spread increases, and the turbulent core length decreases.