Large eddy simulation of buoyant jet in shallow water (original) (raw)

Large eddy simulation of buoyant jet in shallow water Akihiko Nakayama, Jeremy D. Bricker and Zafarullah Nizamani Department of Environmental Engineering, Universiti Tunku Abdul Rahman akihiko@utar.edu.my Abstract A numerical method of predicting the turbulent mixing process of disposed water from an outfall in a shallow coastal water is described. The momentum equations for the sea water mixed with treated water of small salinity and warmer temperature are solved numerically together with the equation of the concentration of the treated water. The basic method is a Large Eddy Simulation (LES) formulated on a fixed rectangular grid where boundaries are approximated by Immersed Boundary (IB) method. The sub-grid effects of the unresolved fluctuations of velocity and the concentration fields are expressed by the eddy viscosity and eddy diffusivity with the Smagorinsky model. The method is verified with an experiment and RANS calculation of the buoyant wall jet issuing on a solid surfa...