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Title: Numerical modelling of 3D stratified free surface flows: A case study of sediment dumping
Authors: Lin, P. 
Wang, D.
Keywords: 3D numerical model
Free surface
Navier-Stokes equations solver
Sediment dumping
Stratified flows
Issue Date: 30-Apr-2006
Citation: Lin, P., Wang, D. (2006-04-30). Numerical modelling of 3D stratified free surface flows: A case study of sediment dumping. International Journal for Numerical Methods in Fluids 50 (12) : 1425-1444. ScholarBank@NUS Repository.
Abstract: A three-dimensional numerical model has been developed to simulate stratified flows with free surfaces. The model is based on the Reynolds-averaged Navier-Stokes (RANS) equations with variable fluid density. The equations are solved in a transformed σ-coordinate system with the use of operator-splitting method (Int. J. Numer. Meth. Fluids 2002; 38:1045-1068). The numerical model is validated against the one-dimensional diffusion problem and the two-dimensional density-gradient flow. Excellent agreements are obtained between numerical results and analytical solutions. The model is then used to study transport phenomena of dumped sediments into a water body, which has been modelled as a strongly stratified flow. For the two-dimensional problem, the numerical results compare well with experimental data in terms of mean particle falling velocity and spreading rate of the sediment cloud for both coarse and medium-size sediments. The model is also employed to study the dumping of sediments in a three-dimensional environment with the presence of free surface. It is found that during the descending process an annulus-like cloud is formed for fine sediments whereas a plate-like cloud for medium-size sediments. The model is proven to be a good tool to simulate strongly stratified free surface flows. Copyright © 2005 John Wiley & Sons, Ltd.
Source Title: International Journal for Numerical Methods in Fluids
ISSN: 02712091
DOI: 10.1002/fld.1105
Appears in Collections:Staff Publications

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