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Validation of a CFD model for flow in meandering rivers using an experimental test-setup: first results
Delecluyse, K.; Branteghem, W.; Troch, P.; Verhoeven, R.; Vierendeels, J. (2008). Validation of a CFD model for flow in meandering rivers using an experimental test-setup: first results, in: Rahman, M. et al. Advances in Fluid Mechanics VII. International series on advances in fluid mechanics, : pp. 55-64
In: Rahman, M.; Brebbia, C.A. (2008). Advances in Fluid Mechanics VII. International series on advances in fluid mechanics. WIT Press: New Forest. ISBN 978-1-84564-109-2. 512 pp., more
In: International series on advances in fluid mechanics. ISSN 1353-808x, more

Available in  Authors 
Document type: Conference

Author keywords
    numerical model; CFD; meandering rivers; open channel flow; experimental results; DYNAMICS

Authors  Top 
  • Delecluyse, K.
  • Branteghem, W.
  • Troch, P., more
  • Verhoeven, R., more
  • Vierendeels, J., more

Abstract
    A 3D Reynolds Averaged Navier, Stokes (RANS) model of a meandering channel with rectangular cross-section has been developed using the commercial software package FLUENT 6.2. This model solves the 3D Navier-Stokes equations using the PISO scheme for the pressure-velocity coupling and the realizable k-epsilon model for turbulence closure. Output of the numerical model is compared to validation experiments conducted in a physical model, which represents two wavelengths of a regime channel and allows for the measurement of flow patterns at several discharges and variable bed forms. The computed water depths and velocity profiles of the CFD model output are in good agreement with the physical model results. The simulations slightly underpredict the streamwise velocities, which reach a maximum just before the apex of the meander bend, at the inner bank in the lower part of the flow depth. The CFD model also captures the motion of the secondary current or transverse flow well, showing the same direction of current along the entire second wavelength.

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