Author(s): G. Pender; D. Keogh; J. R. Manson; P. Addison

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Abstract: The paper reports on the use of high quality LDA measurements of shear layer driven circulations in verifying a three-dimensional numerical model for the simulation of open channel flows. In recent years, much effort has gone into verifying numerical models of flow in straight channels, where the flood plains are parallel to the main channel. In this type of flow a vertical shear layer generates secondary circulations in the channel and flood plains. The main problem facing researchers has been the selection of a turbulence model to reproduce these circulations, see for example Prinos1l. The difficulty with verifying numerical models for fully three-dimensional flow in river channels is that as soon as the main channel is skewed to the flood plain the complexity of the flow increases considerably, Sellin et al. In regions where the flood plain flow passes over the main channel there are large vertical velocities and horizontal shear layer generated circulations occurring within the main channel. In an attempt to isolate some of these features this paper presents comparisons of physical model results of horizontal of shear layer generated circulations in slots with three-dimensional numerical model results. The geometry used here differs from previous slot flow simulations, as the slot walls are vertical with 90o corners.

DOI:

Year: 1995