Comparative study of reduction of pier scour using octagonal and circular collars

Ocean Engineering, Год журнала: 2024, Номер 298, С. 117169 - 117169

Опубликована: Фев. 22, 2024

Язык: Английский

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Experimental investigation of three-dimensional flow dynamics in a laboratory-scale meandering channel under subcritical flow condition

Ocean Engineering, Год журнала: 2024, Номер 302, С. 117557 - 117557

Опубликована: Апрель 1, 2024

Язык: Английский

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Impact of airfoil collar on scour reduction around the bridge pier

Ocean Engineering, Год журнала: 2023, Номер 290, С. 116271 - 116271

Опубликована: Ноя. 20, 2023

Язык: Английский

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Flow in multi-layered vegetated compound channels with different bank slopes

Physics of Fluids, Год журнала: 2023, Номер 35(3)

Опубликована: Фев. 20, 2023

Bank angle and floodplain vegetation emergence determine the flow nature in a compound channel. Two sets of 45° 90° bank channel is considered present work. Each set considers three cases arrangements: no vegetation, multi-layered fully submerged, partially emergent. The characteristics like velocity, Reynolds shear stress (RSS), turbulent kinetic energy (TKE) do not vary much cross section absence vegetation. However, with slopes nearby region are affected most as it acts an intermediary between main floodplain. An analysis anisotropic invariant map shows dominance transverse component compared to velocity around higher for steep (90°) gradual slope (45°) streamwise RSS bursting events also show magnitude near bed sloping region. This indicates instability banks slopes. increase affects TKE greater vulnerability presence emergence. From hydraulic engineering perspective, this study will be helpful field understanding failure ways maintain their stability.

Язык: Английский

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Higher-order turbulence statistics and multiscale characterization of morphodynamics in a riverbank section with an upstream mining pit

Physics of Fluids, Год журнала: 2023, Номер 35(6)

Опубликована: Июнь 1, 2023

Channel dredging has become a common phenomenon across several fluvial systems. Pits dredged in the riverbank can influence downstream turbulence and affect bank slope central channel morphodynamics. Erodible bed experiments were conducted laboratory flume having cross section with three different slopes, i.e., 25°, 31°, 40° without mining pit. Flow over near toe was most affected by pit excavation at upstream. Turbulence levels amplified within flow toe. The logarithmic scaling range of higher-order fluctuations is greater for case. complex interaction simultaneous processes like migration, sliding failure erosion, erosion studied multiple length scales time scales. A wavelet correlation analysis used to calculate celerity bedform migration along flow. Statistical bedforms smaller (up 15 mm scales) significantly higher due interaction. study reveals that instream notable effects on inherent nature statistics, especially toe, as well multiscale morphological structures.

Язык: Английский

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Analyzing the effectiveness of turbulence models in predicting flow around tandem piers

Ocean Engineering, Год журнала: 2025, Номер 321, С. 120467 - 120467

Опубликована: Янв. 26, 2025

Язык: Английский

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Computational and experimental analysis of flow velocity and complex vortex formation around a group of bridge piers

Water Science and Engineering, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

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Quick Method for Estimating Flood Discharge Reduction from Dense Water-Blocking Structures

Journal of Hydrologic Engineering, Год журнала: 2025, Номер 30(2)

Опубликована: Янв. 28, 2025

Язык: Английский

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Morphodynamics of mobile dunes with downward seepage

Physics of Fluids, Год журнала: 2025, Номер 37(2)

Опубликована: Фев. 1, 2025

The experimental study examines the flow dynamics and sediment transport behavior of mobile dune-shaped bedforms induced by downward seepage. longitudinal velocities in stream direction, Reynolds shear stresses (RSS), energy budget, transitional probabilities turbulence bursting events were analyzed without with Application seepage discharge significantly altered patterns, increasing streamwise magnitude RSS on gradually rising face reducing them at crest trailing section bedform. Downward intensifies dissipation diffusion steep slip side dune due to enhanced circulation, which encourages scour hole formation. However, proximity bed initial region surface leeward sections features, turbulent production surges substantially With seepage, anisotropy invariant map shows a shift patterns from two-dimensional (2D) one-dimensional middle sections, while 2D anisotropy. Enhanced transition outward interaction sweep intensify under conditions, vortex strength promoting erosion mobilization conditions. Scour depth over time both no-seepage greater observed Sediment rates also higher than no

Язык: Английский

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Flow Pattern and Turbulent Kinetic Energy Analysis Around Tandem Piers: Insights from k-ε Modelling and Acoustic Doppler Velocimetry Measurements

Water, Год журнала: 2025, Номер 17(7), С. 1100 - 1100

Опубликована: Апрель 7, 2025

This study investigated the distribution and dynamics of Turbulent Kinetic Energy (TKE) around a group three tandem piers using combination numerical simulations experimental measurements. The Volume Fluid (VOF) method, coupled with k-ε turbulence model, was implemented in ANSYS FLUENT to replicate free-surface flow conditions. An validation conducted Acoustic Doppler Velocimetry (ADV) assess model’s capability at capturing characteristics. While model effectively reproduced near-bed turbulence, it consistently underestimated TKE magnitudes across domain, particularly regions strong vortex-induced turbulence. Discrepancies emerged confined between piers, where velocity profiles were overestimated surface near bed mid-depth, impacting predictions. Despite these inconsistencies, general pattern aligned trends, though absolute values remained due inherent limitations model. performance less turbulent demonstrated improved accuracy, reinforcing its applicability for moderate simulations. To further examine interaction vortex structures TKE, distributions analyzed specific depths (z/h = 0.15, 0.4, 0.62). findings showed critical role shedding generation dissipation, notable variations intensity influenced by structural confinement effects. offers novel, high-resolution evaluation ability predict spatially detailed comparisons data. Unlike previous studies that broadly acknowledged limitations, this work systematically identifies regions, vortex-dominated zones, predictive accuracy significantly degrades.

Язык: Английский

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