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Title: Development of a generic three-dimensional model for stratified flows
Keywords: 3-D numerical model, stratified flows, sigma-coordinate, free surface, sediment dumping, non-Boussinesq.
Issue Date: 20-May-2004
Citation: WANG DONGCHAO (2004-05-20). Development of a generic three-dimensional model for stratified flows. ScholarBank@NUS Repository.
Abstract: A three-dimensional numerical model has been developed to simulate stratified flows with free surfaces. The model solves the original Navier-Stokes equations with variable fluid density without Boussinesq approximation. The equations are solved in a transformed s-coordinate system with operator-splitting method (Lin & Li, 2002). The numerical model is validated against the one-dimensional convection-diffusion problem and two-dimensional density-gradient flow in a closed basin. The model is then used to study the transport phenomena of dumped sediments which are modeled in this study as a strongly stratified flow. For the two-dimensional problem, the numerical results are compared well with experimental data on sediment clouds for both fine and coarse sediments. The current model is further extended to study the dumping of sediments in a 3D environment with the presence of free surface. It is found that an annulus-like cloud will be formed for fine sediments whereas a plate-like cloud for coarse sediments.
Appears in Collections:Master's Theses (Open)

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