Title of article :
Simulating disinfection processes in chlorine contact tanks using various turbulence models and high-order accurate difference schemes
Author/Authors :
Hong Wang، نويسنده , , Roger A. Falconer، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1998
Pages :
15
From page :
1529
To page :
1543
Abstract :
The numerical simulation of the disinfection processes in a contact tank involves determining both the flow and solute transport distributions. In this study it has been established that the reliability of the solute transport predictions depends strongly upon the accuracy of the hydrodynamic predictions. In the hydrodynamic computations, it is common practice to combine various turbulence models and numerical schemes to approximate the shear stress and advection terms, e.g. the depth mean eddy viscosity model with either a first-order or third-order upwind difference scheme; the k-ε model or the Smagorinsky model in Large Eddy Simulation (LES) with a first-order upwind scheme, etc. A question which this study also sought to answer, is to what extent the accuracy of the discretization of the advection terms in the solute transport equations affects the discrepancy between the concentration prediction and the physical model, or field measured results, whilst the flow is simulated using various difference and turbulence models. In this study the advection terms in the solute transport equation were evaluated using the QUICK and the third-order upwind difference schemes in separate simulation runs. The numerical predictions of the dye transport within a contact tank for a pulse injection, were compared with experimental measurements carried out in a physical model. It has been demonstrated that the reliability of some predicted bulk characteristics of the flow in a contact tank, such as the depth of flow and the cross-sectional averaged velocity, are of crucial importance in the computation of solute transport processes.
Keywords :
Numerical Modeling , Turbulence model , higher-order upwind scheme , Finite di?erencemethod , contact tank flow , Model comparison
Journal title :
Water Research
Serial Year :
1998
Journal title :
Water Research
Record number :
766490
Link To Document :
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