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Flow and transport simulation of Madeira River using three depth-averaged two-equation turbulence closure models
Authors:Li-ren Yu
Affiliation:Li-ren YU*1, 21. Environmental Software and Digital Visualization (ESDV), So Carlos 13561-120, Brazil2. Association of United Schools-Higher Education Center of So Carlos (ASSER-CESUSC), So Carlos 13574-380, Brazil
Abstract:This paper describes a numerical simulation in the Amazon water system, aiming to develop a quasi-three-dimensional numerical tool for refined modeling of turbulent flow and passive transport of mass in natural waters. Three depth-averaged two-equation turbulence closure models, , , and , were used to close the non-simplified quasi-three-dimensional hydrodynamic fundamental governing equations. The discretized equations were solved with the advanced multi-grid iterative method using non-orthogonal body-fitted coarse and fine grids with collocated variable arrangement. Except for steady flow computation, the processes of contaminant inpouring and plume development at the beginning of discharge, caused by a side-discharge of a tributary, have also been numerically investigated. The three depth-averaged two-equation closure models are all suitable for modeling strong mixing turbulence. The newly established turbulence models such as the model, with a higher order of magnitude of the turbulence parameter, provide a possibility for improving computational precision.
Keywords:river modeling  numerical modeling  contaminant transport  depth-averaged turbulence models  multi-grid iterative method
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