Flume experiments for turbulent flow around a spur dike

Jeon, Jeongsook; Kang, Seokkoo

doi:10.3741/jkwra.2016.49.8.707

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…For instance, Duan et al [10][11][12] captured the turbulence intensity and Reynolds stress of spur dikes by the ADV, and tackled the changes of turbulent states before and after the formation of the scour hole, including outward interaction, ejection, inward interaction, and sweeping. With the aid of the ADV, Jeon and Kang [13] obtained the 3D instantaneous velocities of the 3D turbulences around a spur dike, and derived the turbulence stresses from the obtained data.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Characteristic Analysis of Turbulent Flow near Permeable Spur Dike

Hu¹,

Wang²,

Zhang³

et al. 2020

I2M

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To disclose the turbulence features near a permeable spur dike, this paper measures the three-dimensional (3D) instantaneous velocity at different vertical lines and depths around the permeable spur dike through acoustic Doppler velocimetry (ADV). The relative turbulence intensity and Reynolds stress were calculated for each measuring point, and the distribution features of different turbulence structures were analyzed along the water depth. Experimental results show that: within the length of the dike, the turbulence intensity and Reynolds stress in the downstream of the dike are much greater than those in the upstream. In the downstream of the dike, the turbulence intensity in the root and body regions peaks in the dike crest layer, but that at other positions minimizes in that layer (but peaks on the water surface or river bottom). In the upstream, ejection and sweeping are the dominant turbulence structures; the two structures also dominate near the free layer at the bottom in the downstream; outward and inward interactions dominate near the dike crest layer in the downstream.

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Section: Introductionmentioning

confidence: 99%

Measurement and Characteristic Analysis of Turbulent Flow near Permeable Spur Dike

Hu¹,

Wang²,

Zhang³

et al. 2020

I2M

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Modelling of flow pattern in an open channel with sidewall obstruction

Mulahasan

Al-Osmy

Al-Hashimi

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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To predict flow pattern of shallow obstructed open channel flows, laboratory experiments of flow around a vertical emergent sidewall abutment (lateral constriction) in an open channel flow is simulated numerically and results of water surface and vertical profile of velocity are compared with the numerical results. The turbulence kinetic energy at the separation zone and bed shear stresses are also investigated. A computational fluid dynamic (CFD) numerical tool and volume of fluid (VOF) were used to predict water surface profiles. Results showed a very good agreement between the numerical and the experimental results of the water surface profiles. The numerical findings highlighted an increase in the velocity around the structure of two times the average flow velocity. The maximum pressure was observed in front of the constriction increases with increasing discharges. The vertical velocity profiles upstream the sidewall abutment at the three selected locations showed reasonable results. The maximum turbulence kinetic energy is shown at the zone of separation when the flow passes around the nose with high velocity. In this research, numerically it was found that the estimated bed shear stresses are 2-3 times the mean bed-shear stress of incoming flow. While, previous researchers finding showed a maximum value of bed shear stress near the leading edge 3.63 to 5 times the bed shear stress of the incoming flow. Because of the wide rang variation in calculating bed shear stresses by the previous researchers, so our research aims to calculate it using CFD and compare it with others. Also, dynamics of the flow around the obstacle was considered in this research under uniform flow conditions for an aspect ratio ranged 5 to 10.

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Flume experiments for turbulent flow around a spur dike

Cited by 2 publications

References 14 publications

Measurement and Characteristic Analysis of Turbulent Flow near Permeable Spur Dike

Measurement and Characteristic Analysis of Turbulent Flow near Permeable Spur Dike

Modelling of flow pattern in an open channel with sidewall obstruction

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