Turbulent bursting events within equilibrium scour holes around aligned submerged cylinder

Bauri, Krishna Pada; Sarkar, Arindam

doi:10.1080/14685248.2020.1733587

Cited by 10 publications

(4 citation statements)

References 50 publications

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“…In the present experimental study, the 3D flow structures induced by the experimental emerging sand bar were analyzed by applying the so-called octagonal bursting events approach [66], based on the sign of the experimental three-dimensional velocity fluctuations components [67][68][69].…”

Section: Analysis Of Octagonal Bursting Eventsmentioning

confidence: 99%

Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Khan

Sharma

Lama

et al. 2022

Water

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The many hydrodynamic implications associated with the geomorphological evolution of braided rivers are still not profoundly examined in both experimental and numerical analyses, due to the generation of three-dimensional turbulence structures around sediment bars. In this experimental research, the 3D velocity fields were measured through an acoustic Doppler velocimeter during flume-scale laboratory experimental runs over an emerging sand bar model, to reproduce the hydrodynamic conditions of real braided rivers, and the 3D Turbulent Kinetic Energy (TKE) components were analyzed and discussed here in detail. Given the three-dimensionality of the examined water flow in the proximity of the experimental bar, the statistical analysis of the octagonal bursting events was applied to analyze and discuss the different flume-scale 3D turbulence structures. The main novelty of this study is the proposal of the 3D Hole Size (3DHS) analysis, used for separating the extreme events observed in the experimental runs from the low-intensity events.

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Section: Analysis Of Octagonal Bursting Eventsmentioning

confidence: 99%

Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Khan

Sharma

Lama

et al. 2022

Water

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“…Experimental studies were conducted by Bauri and Sarkar [4] to investigate the effect of submerged circular and square cylinders on turbulence bursting events and sediment transport to gain a better understanding of wall-wake flow. Their quadrant analysis confirms that in wall-wake flows, sweeps are the governing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Bursting phenomenon created by bridge piers group in open channel flow

Ikani

Taha

et al. 2023

Environ Fluid Mech

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Bridge pier is a common feature in hydraulic structure. Its impact to the river usually occurs in group form rather than single pier, so this challenging piers-group influence towards river hydraulics and turbulence needs to be explored. In this paper, the measurements were conducted using an Acoustic doppler velocimeter (ADV) to study velocities in three dimensions (longitudinal, transversal, and vertical). Based on the experimental data, we have observed reversed depth-averaged velocity vector after each pier in the group of three-pier. The analysis has been conducted on the contribution of each bursting event to Reynolds shear stress (RSS) generation, in order to identify the critical events and turbulence structures around the piers. In the upstream near-wake flow in the bed-wall layer, strong sweep and ejection events have been observed; while at downstream, sweeps were more dominant. The pattern of burst changed in the outer layer of flow, where ejections were more dominant. Furthermore, the contribution fractional ratio to RSS variation at hole size H = 0 indicates that sweeps and ejections were significantly generated at the near wake-flow in upstream.

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“…Experimental studies were conducted by Bauri and Sarkar (2020) to investigate the effect of submerged circular and square cylinders on turbulence bursting events and sediment transport to gain a better understanding of wall-wake flow. Their quadrant analysis confirms that in wall-wake flows, sweeps are the governing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Bursting phenomenon created by bridge piers group in open channel flow

Ikani

Taha

et al. 2022

Preprint

View full text Add to dashboard Cite

Bridge pier is a common feature in hydraulic structure. Its impact to the river usually occurs in group form rather than a single pier, so this challenging pier-group influence towards river hydraulics and turbulence needs to be explored. In this paper, the measurements were conducted using an Acoustic Doppler Velocimeter (ADV) to study velocities in three dimensions (longitudinal, transversal, and vertical). Based on the experimental data, we have observed reversed depth-averaged velocity vector after each pier in the group of three-pier. The analysis has been conducted on the contribution of each bursting event to Reynolds shear stress (RSS) generation, in order to identify the critical bursting events and turbulence structures around the piers. In the upstream near-wake flow in the bed-wall layer, strong sweep and ejection events have been observed; while at downstream, sweeps were more dominant. The pattern of bursting changed in the outer layer of flow, where ejections were more dominant. Furthermore, the contribution fractional ratio to RSS variation at hole size H = 0 indicates that sweeps and ejections were significantly generated at the near wake-flow in upstream.

show abstract

Turbulent bursting events within equilibrium scour holes around aligned submerged cylinder

Cited by 10 publications

References 50 publications

Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Bursting phenomenon created by bridge piers group in open channel flow

Bursting phenomenon created by bridge piers group in open channel flow

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