Instytut Budownictwa Wodnego
Polskiej Akademii Nauk

Essay #8876 details

database id8876
titleA numerical study of non-hydrostatic shallow flows in open channels
authorsYebegaeshet T. Zerihun1
pages17 — 35
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keywordsturbulent flow, numerical modelling, non-hydrostatic pressure, rapidly-varied flow, hydraulic structures
abstractsThe flow field of many practical open channel flow problems, e.g. flow over natural bed forms or hydraulic structures, is characterised by curved streamlines that result in a non-hydrostatic pressure distribution. The essential vertical details of such a flow field need to be accounted for, so as to be able to treat the complex transition between hydrostatic and non-hydrostatic flow regimes. Apparently, the shallow-water equations, which assume a mild longitudinal slope and negligible vertical acceleration, are inappropriate to analyse these types of problems. Besides, most of the current Boussinesq-type models do not consider the effects of turbulence. A novel approach, stemming from the vertical integration of the Reynolds-averaged Navier-Stokes equations, is applied herein to develop a non-hydrostatic model which includes terms accounting for the effective stresses arising from the turbulent characteristics of the flow. The feasibility of the proposed model is examined by simulating flow situations that involve non-hydrostatic pressure and/or nonuniform velocity distributions. The computational results for free-surface and bed pressure profiles exhibit good correlations with experimental data, demonstrating that the present model is capable of simulating the salient features of free-surface flows over sharply-curved overflow structures and rigid-bed dunes.
attributes [reviewed] [scientific]
database id8872
seriesArchives of Hydro-Engineering and Environmental Mechanics
issueVol. 64, No. 1
publisherWydawnictwo IBW PAN


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