Multiblock numerical model for natural rivers

Sanjiv K. Sinha, Fotis Sotiropoulos, A. Jacob Odgaard

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A three-dimensional numerical model for simulating turbulent flow through natural river reaches with islands is developed. Unlike most available numerical models - which typically employ depth-averaged approaches - the present method is capable of simulating the complex patterns of secondary flow which are responsible for three-dimensional transport and mixing. The model employs the three-dimensional, Reynolds-averaged Navier-Stokes equations along with the k-ε model for turbulence closure. The governing equations are formulated in generalized, non-orthogonal, curvilinear coordinates in order to facilitate the modeling of river reaches with complex topographic features. The presence of islands and/or rock outcrops is accounted for by employing a multi-block grid generation approach which facilitates the discretization of complex multi-connected domains. The capabilities of the proposed method are demonstrated by applying it to calculate turbulent flow through a simplified river geometry - a 90 degree rectangular bend with a model `island' near its inner wall. Preliminary calculations for a natural river channel - a two-mile reach of the Colombia River, downstream of Wanapum dam - are also presented and discussed.

Original languageEnglish (US)
Title of host publicationWaterpower - Proceedings of the International Conference on Hydropower
Number of pages10
StatePublished - Jan 1 1995
EventProceedings of the 1995 International Conference on Hydropower. Part 1 (of 3) - San Francisco, CA, USA
Duration: Jul 25 1995Jul 28 1995


OtherProceedings of the 1995 International Conference on Hydropower. Part 1 (of 3)
CitySan Francisco, CA, USA


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