Abstract
The motions of starting plumes traveling down slopes are investigated by large eddy simulations. The formulation of the model is based on the filtered two-dimensional Navier-Stokes equations and transport equation for density excess which is deduced from the conservation of mass. The subgrid-scale turbulent stress is evaluated by the Smagorinsky model. It is found that the model can give a good description of the front of inclined plumes over a wide range of slope angle (10°≤θ≤ 90°), when the following empirical relationships for the Smagorinsky constant Cs=0.06+0.1 sin θ and for the subgrid turbulent Schmidt number Scs=0.4-0.3 sin θ are used. The computational results further revealed the flow pattern, the density distribution as well as the mechanism of entrainment at the head of inclined plumes.
