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http://dx.doi.org/10.3741/JKWRA.2017.50.9.637

Numerical simulation of dense interflow using the k-ε turbulence model  

Choi, Seongwook (Department of Civil & Environmental Engineering, Yonsei University)
Choi, Sung-Uk (Department of Civil & Environmental Engineering, Yonsei University)
Publication Information
Journal of Korea Water Resources Association / v.50, no.9, 2017 , pp. 637-646 More about this Journal
Abstract
This study presents a numerical model for simulating dense interflows. The governing equations are provided and the finite difference method is used with the $k-{\varepsilon}$ turbulence model. The model is used to simulate a dense interflow established in a deep ambient water, resulting velocity and excess density profiles. It is observed that velocity decreases in the longitudinal direction due to water entrainment in the vicinity of the outlet and rarely changes for increased Richardson number. Similarity collapses of velocity and excess density are obtained, but those of turbulent kinetic energy and dissipation rate are not. A shape factor for the dense interflow is obtained from the simulated profiles. The value of this shape factor can be used in the layer-averaged modeling of dense interflows. In addition, a buoyancy-related parameter ($c_{3{\varepsilon}}$) for the $k-{\varepsilon}$ model and the volume expansion coefficient (${\beta}_0$) are obtained from the simulated results.
Keywords
Dense interflow; $k-{\varepsilon}$ turbulence model; Layer-averaged model; Water entrainment; Buoyancy-related model parameter; Volume expansion coefficient;
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