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|Title:||Numerical modelling of 3D stratified free surface flows: A case study of sediment dumping||Authors:||Lin, P.
|Keywords:||3D numerical model
Navier-Stokes equations solver
|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. https://doi.org/10.1002/fld.1105||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/65899||ISSN:||02712091||DOI:||10.1002/fld.1105|
|Appears in Collections:||Staff Publications|
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