Results 261 to 270 of about 24,409 (308)

Bedload resistance in supercritical flow

International Journal of Sediment Research, 2009
Abstract The movement of bedload in subcritical flow produces additional roughness as compared to flow in a rigid bed. The magnitude of this bed load roughness is proportional to the thickness of the sediment layer moving along the bed, the particle size and the sediment concentration.
Alireza HABIBZADEH, Mohammad Hossein OMID   +1 more
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Resistance to flow in rough supercritical sheet flow

Earth Surface Processes, 1980
AbstractShallow water depths on steep slopes of as much as fifty per cent can be measured easily by weighing a light flume and the water it contains. Because water accelerates along the flume, a good approximation of the steady state depth is obtained when the recording balance is fixed to its bottom end.From the unit discharge and the depth, and not ...
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Boundary Controllability between Sub- and Supercritical Flow

SIAM Journal on Control and Optimization, 2003
The author considers the flow through a frictionless horizontal rectangular channel that is governed by de St. Venant equations and show that the state can be controlled in finite time from a stationary initial state to a given stationary terminal state in such a way that during this transition, the state stays in the class of \(C^{1}\) functions, so ...
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On the numerical modelling of supercritical flow

Journal of Hydraulic Research, 1993
In the numerical modelling of unsteady mixed subcritical and supercritical flows, a great simplification is attained when the algorithmic structure can be kept invariant during the whole course of the computation. This is commonly attained by reducing the influence of the convective momentum term when the flow approaches supercritical conditions, so as
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Supercritical Flow in Chute Contraction

Journal of Hydraulic Engineering, 1998
Contractions with supercritical flow generate shockwaves requiring significantly larger wall heights than predicted by one-dimensional flow equations. Three distinct waves in a straight-walled contraction may be identified: wave 1 downstream from the contraction point, wave 2 in the chute axis, and wall wave 3 beyond the contraction end.
Roger Reinauer, Willi H. Hager
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Supercritical flow in a divergent channel

Journal of Fluid Mechanics, 1973
For flow of a viscous fluid in a divergent channel of small angle it is shown that small disturbances to the basic Jeffery-Hamel flow may grow, according to nonlinear theory, to produce a secondary (supercritical) flow, in which the main flow winds from side to side in the channel and vortices form, with the whole pattern moving slowly downstream.
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Sediment Transport in Supercritical Flow

Journal of the Hydraulics Division, 1965
A study is made of the transition between flow of a solids-fluid mixture in the fully suspended regime and flow with a sediment bed. It is shown that the critical deposit condition is a function of solids concentration, Reynolds number, Froude number, and geometry of flow. A dimensional analysis is tested by experimental data.
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Supercritical Flow Over Sills

Journal of the Hydraulics Division, 1976
Experimental investigations have been carried out to study the supercritical flow over a square section sill for all flow situations, except the jump condition. The supercritical flow has been categorized into two distinct types depending upon the ratio of the sill height to upstream depth and the Froude number.
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Supercritical Flow in Channel Junctions

Journal of Hydraulic Engineering, 1989
Using both a theoretical and an experimental approach, the main flow features in junctions with thoroughly supercritical flows are considered. The junctions are characterized by rectangular channels of equal branch width and sharpedged corners. Junction angles of 22.5° and 45° are considered.
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Experiments to supercritical junction flow

Experiments in Fluids, 1995
Supercritical flow at channel junctions is characterised by a distinct standing wave pattern. This paper aims at describing its features and defining the main dimensions of three waves. Wave C is a junction wave located at the rear of the junction point and may be compared with the wave due to an abrupt wall deflection.
M. Schwalt, W. H. Hager
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