Experimental Investigation of Shallow Recirculating Flows

Babarutsi, S.; Ganoulis, Jacques; Chu, Vincent H.

doi:10.1061/(asce)0733-9429(1989)115:7(906)

Cited by 58 publications

(39 citation statements)

References 20 publications

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“…Increasing the bottom roughness up to k s = 0.005 m leads to hardly noticeable changes in the velocity profiles. Flow resistance remains indeed very weak, since the head loss across the reservoir is in any case of the order of 1 − 2 × 10 −4 m. These results are in agreement with Babarutsi et al (1989), Babarutsi andChu (1991) and Chu et al (2004) for unilateral expansions: since the bed friction number remains here lower than 0.05, the flow is classified as "non-frictional" and is thus not influenced by the roughness. In the L-L configuration (Fig.…”

Section: Velocity Profilessupporting

confidence: 81%

Coupling between flow and sediment deposition in rectangular shallow reservoirs

Camnasio

Erpicum

Orsi³

et al. 2013

Journal of Hydraulic Research

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Flow velocity and sedimentation patterns were investigated experimentally and numerically in shallow rectangular reservoirs with different asymmetric locations of the inlet and outlet channels. Velocity fields were measured in the entire reservoir, both for clear water flow and with suspended sediments. Thickness of sediment deposits was mapped in the whole reservoir by means of a laser light method. In one of the studied geometric configurations, injection of suspended sediments led to a complete change in the observed flow field. Experimental results were compared with numerical simulations performed with the depth-averaged flow model WOLF 2D, using a depth-averaged k-ε turbulence model. The simulations lead to accurate predictions of the velocity profiles and the change in flow pattern as a result of sediment deposits was successfully reproduced.

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Section: Velocity Profilessupporting

confidence: 81%

Coupling between flow and sediment deposition in rectangular shallow reservoirs

Camnasio

Erpicum

Orsi³

et al. 2013

Journal of Hydraulic Research

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“…Several studies indicate that the length of the recirculation zone over unilateral expansions depends only on the lateral expansion for small values of the bed friction number; for large values, however, the reattachment length depends only on a friction length scale (Babarutsi et al 1989, Babarutsi and Chu 1991, Chu et al 2004). …”

Section: Froude Number F = U/(gh)mentioning

confidence: 99%

“…To the knowledge of the authors, only the median position has been reported in the literature, using, for example, visualization of displacement of confetti on the water surface (Babarutsi et al 1989, Babarutsi and Chu 1991, Chu et al 2004. Only Abbott and Kline (1962) characterized fluctuations of the reattachment lengths by carrying out a large number of tests.…”

mentioning

confidence: 99%

Classification of flow patterns in rectangular shallow reservoirs

Dufresne

Dewals

Erpicum

et al. 2010

Journal of Hydraulic Research

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This work focuses on the experimental classification of flow patterns in rectangular shallow reservoirs, including symmetric flows without any reattachment point to asymmetric flows with one reattachment point, two reattachment points, or two reattachment points and one detachment point. The median position and the natural variability of the reattachment lengths 2 of asymmetric flows were measured for forty geometric and hydraulic conditions. The effects of dimensionless flow depth, Froude number, lateral expansion ratio and dimensionless length on the median reattachment lengths were analyzed. A number of regression equations were proposed. For "high" dimensionless flow depths and a Froude number of 0.20, a shape parameter was proposed for predicting the transition between symmetric and asymmetric flows. The results of this study are useful knowledge for improving current methods to predict the trapping efficiency and the preferential regions of deposition in reservoirs.

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“…For the present experimental case the bed friction number was = /2 = 0.73 which according to Babarutsi et al (1989) falls in the classification of shallow condition.…”

Section: Experimentationmentioning

confidence: 81%

“…Following Babarutsi et al (1989), the bed friction number of the incoming flow can be defined as = /2 , where is the bed friction coefficient. Genic et al (2011) reviewed the most common explicit expressions for the estimation of the friction factor in rough and smooth bed conditions.…”

Section: Experimentationmentioning

confidence: 99%

Assessment of 3D-RANS models for the simulation of topographically forced shallow flows

Safarzadeh

Brevis

2016

Journal of Hydrology and Hydromechanics

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Abstract:In this work the performance of Reynolds Averaged Navier-Stokes (RANS) simulations to predict the flow structure developed by the presence of a sidewall obstacle in a uniform open-channel shallow flow is discussed. The tested geometry was selected due to its important role in several fluvial applications, such as the control of riverbank erosion and the creation of improved ecological conditions in river restoration applications. The results are compared against experimental laboratory velocity fields obtained after Large Scale Particle Image Velocimetry (LSPIV) measurements. It is shown that the length of reattachment of the separated shear layer generated by the obstacle is well predicted by a Reynolds Stress Model, while classical two-equation models show important limitations. All the performed RANS simulations are unable to properly predict the formation of a secondary gyre region, which develops immediately downstream the obstacle.

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Experimental Investigation of Shallow Recirculating Flows

Cited by 58 publications

References 20 publications

Coupling between flow and sediment deposition in rectangular shallow reservoirs

Coupling between flow and sediment deposition in rectangular shallow reservoirs

Classification of flow patterns in rectangular shallow reservoirs

Assessment of 3D-RANS models for the simulation of topographically forced shallow flows

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