Turbulent characteristics of sinuous river bend

Taye, Jyotismita; Barman, Jyotirmoy; Patel, Mahesh; Kumar, Bimlesh

doi:10.1080/09715010.2019.1629843

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…RSS in the mobile bed flow at each section is higher than that of clear water flows due to sediment transport. The outer layer of each section in case of clear water flow is observed negative values, whereas in the case of mobile bed conditions, negative values are observed at sections S-1, S-2 and S-4 above the height of 0.25 h. Taye et al (2021) confirmed that a negative value of RSS can be observed in a meandering channel. The negative values of RSS come because of the narrow meandering channel.…”

Section: Reynolds Shear Stressessupporting

confidence: 70%

“…The velocity in the lateral direction indicates that the velocities are more scattered up to 0.2 h from the bed surface; thereafter, the velocity increases smoothly and gives a positive value. Quite similar longitudinal and lateral velocity profiles were found at the apex of the sinuous channel (Taye et al 2021). The velocity in the vertical direction gives both negative and positive values and shows more randomness due to the tiny reverse flow occurring at the bend portion.…”

Section: Mean Flow Velocitysupporting

confidence: 62%

“…The stresses at the channel's bank present the high-momentum flux near the bank regions where erosion and deposition activities dominate. Taye et al (2021) examined the turbulent flow characteristics and bursting events at the centre of the bend in a meandering channel with a uniform sand bed and contribute that the sweep events are maximum nearer to the channel bed. Graf & Blanckaert (2002) studied experiments in a 120°sharp bend and discovered a large and a small secondary rotation cell at the centre and outer region of the apex, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Turbulent flow mechanisms in meandering channels with sediment transport

Sahoo

Sharma

2023

Water Practice and Technology

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This research aims to investigate the near-bed turbulent flow characteristics in a meandering channel with both mobile bed and immobile bed conditions. Experiments were performed in a prismatic rectangular meandering channel with a non-uniform sand bed of size d50 = 0.523mm. The three-dimensional instantaneous fluid velocity was collected using the Acoustic Doppler velocimeter which will provide important results related to the flow turbulence such as mean flow velocity, turbulence intensity, Reynolds shear stress, turbulent kinetic energy, skewness, kurtosis and turbulent anisotropy. The secondary current flow and the exchange of momentum in the form of turbulence kinetic energy, Reynolds shear stress and turbulent intensity at the inner layer of the flow are identified more in a mobile bed condition as compared to an immobile condition, which causes sediment transport. For the inner layer of the flow, turbulence intensity and turbulent kinetic energy are decreased in magnitude and gradually increase in the outer layer of flow for both the bed conditions. Higher turbulence anisotropy is noticed in the mobile bed condition than in the immobile bed condition, which shows more nonuniformities near the bed level for the mobile bed condition. This study may help in understanding the effect of sediment transport due to a turbulent flow structure in a sinuous alluvial channel.

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Section: Reynolds Shear Stressessupporting

confidence: 70%

Section: Mean Flow Velocitysupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Turbulent flow mechanisms in meandering channels with sediment transport

Sahoo

Sharma

2023

Water Practice and Technology

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“…A measurement duration of 300 s was used. The signal-to-noise ratio (SNR) and signal correlation Following the recent research works (Taye et al 2019;Sharma and Kumar 2019;Sharma et al 2021;and Ghasempour et al 2022), the uncertainty analysis of ADV data was done by recording 10 data samples of the velocity at 10 mm away from the flume bed. The uncertainty of the velocity gradient (∂ū/∂z), the streamwise velocity (ū), the vertical velocity (w), the streamwise turbulence intensity (…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

Wake flow field of a wall-mounted pipe with spoiler on a rough channel bed

et al. 2023

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This research work focuses on the wake flow region of a cylinder with a spoiler on a rough bed under steady flow conditions. The acoustic Doppler velocimetry was used for the measurement of three-dimensional velocity data for two Reynolds numbers in a fully developed turbulent flow around the cylinder with a spoiler. The mean flow velocities, second-order turbulence structures, and conditional statistics were investigated in the wake region of the spoilered cylinder. The flow was separated from the spoiler with the formation of two shear layers between free surface flow and recirculating flow. It is observed that the flow is reattaching to the bed at 11D irrespective of the Reynolds number. Downstream of the cylinder, the mean velocity distributions are asymmetric due to the wall–wake effect, and the point of inflection is observed for each velocity profile at z = 0.40ẟ. The turbulence intensities, Reynolds stresses, and TKE are highly enhanced in the wake region of the cylinder as compared to their respective upstream values for both runs. The turbulence intensities, Reynolds normal stresses, Reynolds shear stresses, and turbulent kinetic energy are attaining peaks at z = 0.4 ẟ for all the streamwise locations, and the peaks are found to be highest at x = 10D. The quadrant analysis results indicate that the sweeps are dominating bursting events in the inner and intermediate layers, while ejections are dominating in the outer layer of the wake region. As the hole size, H increases ejections stress fraction rises as compared to that of the sweeps in the wake region for z = 0.2–0.7 h.

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“…Whether there is a steady or unsteady flow, bed erosion occurs at a sharp river bend, causing significant damage to infrastructure along the rivers. [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Flow and sediment transport in a sharp river bend using a 3D-RANS model

Sisinggih

Wahyuni

Rasyid

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Flow dynamics and sediment transport in a river bend have recently been studied using experimental and numerical investigations. A three-dimensional numerical modeling model named NaysCUBE was used in this study to describe the flow pattern and process of sediment transport in a sharp river bend as a complement to the prior work of the physical hydraulic model. The model uses the RANS equation to simulate flow where a fully complex 3D flow is governed. Despite the limitations of the RANS model, NaysCUBE well reproduces the flow pattern and turbulence phenomena in a movable bed channel with sharp curvature. Compared with data from a prior experiment, the morphological adjustment is simulated sufficiently. The three-dimensional flow structures are useful for determining the appropriate countermeasures for local scouring and riverbank protection.

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Turbulent characteristics of sinuous river bend

Cited by 12 publications

References 23 publications

Turbulent flow mechanisms in meandering channels with sediment transport

Turbulent flow mechanisms in meandering channels with sediment transport

Wake flow field of a wall-mounted pipe with spoiler on a rough channel bed

Flow and sediment transport in a sharp river bend using a 3D-RANS model

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