Hiroyuki MASHITO
Analysis of Density Interflow Using k - ŠĆ Turbulence Model
Tokuzou HOSOYAMADA, Yusuke FUKUSHIMA
The density interflow is generated by density differences between the upper, lower and intrusion water. An example of the interflow is a motion of turbid interflow into stratified reservoir where density of the lower layer is larger than that of the inflow water.
In this study, the density interflow is analyzed numerically using the k - ŠĆ turbulence model. The model consists of the mass balance equations of water and salinity, Reynolds equations, equation of kinetic energy of turbulence and the equation of viscous dissipation rate of turbulence. The mechanism of density interflow is clarified.
Firstly, the numerical results of travel speed and thickness are compared to the experimental results obtained by Fukushima. The numerical model using k - ŠĆ turbulence model explains good characteristics of the density interflow.
Next, the numerical calculation for density interflow that changes density of the intrusion and lower layer water is carried out. Comparison between numerical and experimental results of travel speed and thickness generally show a good agreement. The contours of salinity concentration and velocity vectors of a density interflow for six cases are also obtained and show the flow mechanism in a density interflow clearly.
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