Numerical modelling of the velocity distribution in a compound channel

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Title:Numerical modelling of the velocity distribution in a compound channel
Creators:
Othman, Farida; faridahothman at um dot edu dot my; Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Valentine, Eric M.; eric dot valentine at cdu dot edu dot au; School of Engineering and Logistics, Charles Darwin University, Darwin NT 0909, Australia
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 54, 3, pp. 269-279
Uncontrolled Keywords:Compound Channel, Navier-Stokes Equation, Non-linear k-ε Turbulence Model, Reynolds Stress Model (RSM), Velocity Distribution, Secondary Currents

Abstract

Uniform flow in compound channels has been studied in terms of a numerical model, called the NKE model. The model uses the three dimensional Navier-Stokes equations in conjunction with the non-linear k-? turbulence model. The latter is used for the calculation of the Reynolds stress components responsible for the generation of the secondary currents. This model is based on the SIMPLE technique, and computes the six parameters U, V, W, P, k, and ? using wall functions on a Cartesian grid. The NKE model was used to simulate the compound open channel flows of the UK Flood Channel Facility run 080301 (Shiono and Knight, 1989). The Reynolds Stress Model (RSM) of FLUENT was also used as a comparison. The results obtained have shown that the NKE and RSM models can reasonably predict the primary mean velocity and secondary currents. Although agreement is certainly not perfect in every detail, the main features of the flow are reproduced. The bulging of the contours at the bottom corner of the main channel, the inclination of the contours near the free surface towards the channel centre, and the depression of the maximum velocity below the free surface can be seen. These are consistent with the pattern of the secondary flows, which are mainly formed by two vortices, namely the main channel vortex and flood plain vortex. These vortices, which originate near the main channel-flood plain junction, can be reproduced by the NKE and RSM models.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Numerical modelling of the velocity distribution in a compound channel
Translated title:Numerické modelovanie rozdelenia rýchlosti v zloženom koryte
Creators:
Othman, Farida; faridahothman at um dot edu dot my; Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Valentine, Eric M.; eric dot valentine at cdu dot edu dot au; School of Engineering and Logistics, Charles Darwin University, Darwin NT 0909, Australia
Uncontrolled Keywords:Compound Channel, Navier-Stokes Equation, Non-linear k-ε Turbulence Model, Reynolds Stress Model (RSM), Velocity Distribution, Secondary Currents
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:54
Number:3
Page Range:pp. 269-279
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:5930
Item Type:Article
Deposited On:11 Jun 2010 14:43
Last Modified:11 Jun 2010 12:43

Citation

Othman, Farida; Valentine, Eric M. (2006) Numerical modelling of the velocity distribution in a compound channel. Journal of Hydrology and Hydromechanics, 54 (3). pp. 269-279. ISSN 0042-790X

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