Keywords

three-dimensional model; buoyancy plume; salinity; sediment

Location

Session A1: Environmental Fluid Mechanics - Theoretical, Modelling and Experimental Approaches

Start Date

12-7-2016 5:30 PM

End Date

12-7-2016 5:50 PM

Description

The paper developed a three-dimensional model for buoyancy plume coupling with the comprehensive effects of different temperature, sediment and salinity. The model includes mass continuity equation, momentum equation and energy equation, state equation, Renormalization Group (RNG) κ-ε turbulence transport equation, sediment scour equation, salinity advection equation. The discretization scheme of Finite Difference Method (FDM) is used to solve Reynolds-Averaged Navier-Stokes (RANS) equation, combining the discretization method of the central difference scheme and the upwind scheme. A method called Generalized Minimal Residual Algorithm (GMRES) is used to solve velocity-pressure term of discrete equation. The volume of fluid (VOF) method is adopted to track the free surface. Fractional Area and Volume Obstacle Representation (FAVOR) method is used to simulate complex geometric regions. The method can effectively overcome the shortcomings of the finite difference method, which was unable to fit the complex boundary precisely enough. The temperature field was validated by experimental results conducted by Balasubramanian et al. in 1978. Experiment was done for the validation of the salinity field. The results show that the simulation results are in good agreement with the experiments. It demonstrates that the three-dimensional mathematical model developed in the paper can be used for the simulation of the buoyancy plume with the comprehensive effects of different temperature, salinity and sediment.

 
Jul 12th, 5:30 PM Jul 12th, 5:50 PM

Study on the buoyancy plume model coupling with the effects of temperature, salinity and sediment

Session A1: Environmental Fluid Mechanics - Theoretical, Modelling and Experimental Approaches

The paper developed a three-dimensional model for buoyancy plume coupling with the comprehensive effects of different temperature, sediment and salinity. The model includes mass continuity equation, momentum equation and energy equation, state equation, Renormalization Group (RNG) κ-ε turbulence transport equation, sediment scour equation, salinity advection equation. The discretization scheme of Finite Difference Method (FDM) is used to solve Reynolds-Averaged Navier-Stokes (RANS) equation, combining the discretization method of the central difference scheme and the upwind scheme. A method called Generalized Minimal Residual Algorithm (GMRES) is used to solve velocity-pressure term of discrete equation. The volume of fluid (VOF) method is adopted to track the free surface. Fractional Area and Volume Obstacle Representation (FAVOR) method is used to simulate complex geometric regions. The method can effectively overcome the shortcomings of the finite difference method, which was unable to fit the complex boundary precisely enough. The temperature field was validated by experimental results conducted by Balasubramanian et al. in 1978. Experiment was done for the validation of the salinity field. The results show that the simulation results are in good agreement with the experiments. It demonstrates that the three-dimensional mathematical model developed in the paper can be used for the simulation of the buoyancy plume with the comprehensive effects of different temperature, salinity and sediment.