scholarly journals ANALYSIS OF OPEN-CHANNEL CONFLUENCE FLOW HAVING DIFFERENT STEEP SLOPES IN FIXED BED AND MOVABLE BED

2007 ◽  
Vol 51 ◽  
pp. 823-828
Author(s):  
Takashi DEGUCHI ◽  
Ichiro FUJITA ◽  
Ryota TSUBAKI ◽  
Masashi OZONO
Keyword(s):  
Open Channel ◽  
Fixed Bed ◽  
Steep Slopes ◽  
Movable Bed ◽  
Channel Confluence

scholarly journals Turbulent flow structure at a 90-degree open channel confluence: Accounting for the distortion of the shear layer

2016 ◽  
Vol 12 ◽  
pp. 130-147 ◽  
Author(s):  
Saiyu Yuan ◽  
Hongwu Tang ◽  
Yang Xiao ◽  
Xuehan Qiu ◽  
Huiming Zhang ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Open Channel ◽  
Turbulent Flow Structure ◽  
Channel Confluence

Flow patterns in an open channel confluence with a small ratio of main channel to tributary discharge

2014 ◽  
pp. 989-996 ◽  
Author(s):  
L Schindfessel ◽  
S Creëlle ◽  
T Boelens ◽  
T De Mulder
Keyword(s):  
Open Channel ◽  
Flow Patterns ◽  
Main Channel ◽  
Small Ratio ◽  
Channel Confluence

RIGID-LID LES PREDICTIONS OF THE 3D-FLOW IN AN OPEN-CHANNEL CONFLUENCE WITH CONCORDANT AND DISCORDANT BEDS

2019 ◽  
Author(s):  
PEDRO XAVIER RAMOS ◽  
LAURENT SCHINDFESSEL ◽  
JOÃO PEDRO PÊGO ◽  
TOM DE MULDER
Keyword(s):  
Open Channel ◽  
3D Flow ◽  
Channel Confluence

scholarly journals Flat vs. curved rigid-lid LES computations of an open-channel confluence

2019 ◽  
Vol 21 (2) ◽  
pp. 318-334 ◽  
Author(s):  
Pedro Xavier Ramos ◽  
Laurent Schindfessel ◽  
João Pedro Pêgo ◽  
Tom De Mulder
Keyword(s):  
Free Surface ◽  
Secondary Flow ◽  
Open Channel ◽  
Pressure Field ◽  
Large Eddy Simulations ◽  
Numerical Treatment ◽  
Mean Flow ◽  
Large Eddy ◽  
Flow Case ◽  
Channel Confluence

Abstract This paper describes the application of four Large Eddy Simulations (LES) to an open-channel confluence flow, making use of a frictionless rigid-lid to treat the free-surface. Three simulations are conducted with a flat rigid-lid, at different elevations. A fourth simulation is carried out with a curved rigid-lid which is a closer approximation to the real free-surface of the flow. The curved rigid-lid is obtained from the time-averaged pressure field on the flat rigid-lid from one of the initial three simulations. The aim is to investigate the limitations of the free-surface treatment by means of a rigid-lid in the simulation of an asymmetric confluence, showing the differences that both approaches produce in terms of mean flow, secondary flow and turbulence. After validation with experimental data, the predictions are used to understand the differences between adopting a flat and a curved rigid-lid onto the confluence hydrodynamics. For the present flow case, although it was characterized by a moderately low downstream Froude number (Fr ≈ 0.37), it was found that an oversimplification of the numerical treatment of the free-surface leads to a decreased accuracy of the predictions of the secondary flow and turbulent kinetic energy.

Experimental Investigation of Free Surface Gradients in a 90° Angled Asymmetrical Open Channel Confluence

2018 ◽  
pp. 803-819 ◽  
Author(s):  
Stéphan Creëlle ◽  
Lukas Engelen ◽  
Laurent Schindfessel ◽  
Pedro X. Ramos ◽  
Tom De Mulder
Keyword(s):  
Experimental Investigation ◽  
Free Surface ◽  
Open Channel ◽  
Channel Confluence

Three-dimensional flow structure at fixed 70° open-channel confluence with bed discordance

2019 ◽  
Vol 58 (3) ◽  
pp. 434-446 ◽  
Author(s):  
Olga Birjukova Canelas ◽  
Rui M.L. Ferreira ◽  
Sebastián Guillén-Ludeña ◽  
Francisco C. Alegria ◽  
António H. Cardoso
Keyword(s):  
Flow Structure ◽  
Open Channel ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Channel Confluence

scholarly journals ON A COEXISTENCE SYSTEM OF FLOW AMD WAVES

1966 ◽  
Vol 1 (10) ◽  
pp. 25
Author(s):  
Junzaburo Matsunashi
Keyword(s):  
Channel Flow ◽  
Periodic Motion ◽  
Water Surface ◽  
Open Channel ◽  
Forced Oscillation ◽  
Fixed Bed ◽  
Open Channel Flow ◽  
Experimental Fact ◽  
Incoming Wave ◽  
Mechanical Effects

It is a well known experimental fact that the undulation such as sand-ripples or antidunes are formed on the bed surface composed of fine sand, corresponding to the flow characteristics of open channel flow.O In this case, as the mechanical effects of the bed undulationes stated above, a kind of periodic motion is superposed on the flow, and accordingly the water surface undulates periodically. On the other hand, the mechanical effects of this surface undulationes are surperposed on these undulating bed surfaces as another kind of periodic motion. The wave generated in open sea propagates upstream through an estuary. Accordingly the incoming wave is superposed on the flow stated above as a forced oscillation. Both of these phenomena are in the coexistence system of flow and waves in the open channel flow. In this paper, as the first step to study the subjects stated above, the author treats the problem of the coexistence system in the case when the forced oscillation of water surface is superposed on the open channel flow with fixed bed, and analyzes theoretically and experimentally the mechanical properties of the reciprocal action between flow and waves.

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