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Numerical modelling of the velocity distribution in a compound channel

Othman, F. and Valentine, Eric M. (2006). Numerical modelling of the velocity distribution in a compound channel. Vodohospodarsky Casopis,54(3):269-279.

Document type: Journal Article
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IRMA ID 78668828xPUB11
Title Numerical modelling of the velocity distribution in a compound channel
Author Othman, F.
Valentine, Eric M.
Journal Name Vodohospodarsky Casopis
Publication Date 2006
Volume Number 54
Issue Number 3
ISSN 0042-790X   (check CDU catalogue open catalogue search in new window)
Start Page 269
End Page 279
Total Pages 11
Place of Publication Slovak Republic
Publisher Institute of Hydrology of the Slovak Academy of Sciences and the Inst of Hydrody
Field of Research 0905 - Civil Engineering
HERDC Category C1 - Journal Article (DEST)
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.
Additional Notes Parallel language title: Journal of Hydrology and Hydromechanics
 
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