3D Numerical Simulation of Deposition Patterns due to Sand Disposal in Flowing Water
Publication: Journal of Hydraulic Engineering
Volume 127, Issue 3
Abstract
A 3D numerical model has been developed to study the deposition patterns for sediment dumping in ambient water with cross-flow. The model formulation is based on the governing equations for the conservation of mass, momentum, and density excess, assuming the discrete particles can be represented by a continuous field of density difference with a specified settling velocity. To model the turbulence generated by the particles, a buoyancy extended k-ε model is employed. Numerically, the governing equations are split into three parts in the finite-difference solution: advection, dispersion, and pressure propagation. The advection part is solved by a characteristics-based scheme, the dispersion part is solved by the central difference method, and the pressure propagation part is solved implicitly by using the Gauss-Seidel iteration method. The computed results show that two different deposition patterns exist. One is oblong, and the other is horseshoe-shaped, depending on the ratio of the initial negative buoyancy flux of the sand discharge and the horizontal momentum flux of the flow. The computed results are in satisfactory agreement with experiments. The existence of the two different deposition patterns is explained by using the concept of bifurcation of buoyant plumes.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 127 • Issue 3 • March 2001
Pages: 209 - 218
History
Received: Nov 17, 1999
Published online: Mar 1, 2001
Published in print: Mar 2001
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