Computation of Dye Concentration in Shallow Recirculating Flow
Publication: Journal of Hydraulic Engineering
Volume 123, Issue 9
Abstract
The Lagrangian second-moment method is used to compute the dye-concentration distribution in turbulent recirculating flow generated in a shallow open channel by a sudden widening of flow in the transverse direction. The performance of the second-moment method is compared with the Eulerian numerical schemes of Upwind, QUICK, HLPA, and the semi-Lagrangian Hermite scheme. The results show that the Lagrangian second-moment method is an accurate and a very promising scheme for the computation of concentration distribution in flows dominated by advection. It minimizes the generation of numerical diffusion, is free from numerical oscillations, and is independent of the value of Courant number. Its efficiency in terms of computational time is high in flows where the mixing is confined to a small region of the solution domain and low in flows where the mixing is extended in the whole solution domain. In addition to an accurate numerical scheme, a necessary requirement for the accurate prediction of concentration field is a hydrodynamic model able to determine correctly the velocity field and the diffusion coefficient in shallow recirculating flows.
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Information
Published In
Journal of Hydraulic Engineering
Volume 123 • Issue 9 • September 1997
Pages: 793 - 805
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Sep 1, 1997
Published in print: Sep 1997
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