Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier

Guan, Dawei; Chiew, Yee‐Meng; Wei, Maoxing; Hsieh, Sheng‐Jen

doi:10.1016/j.ijsrc.2018.07.001

Cited by 103 publications

(31 citation statements)

References 27 publications

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“…The critical velocity for incipient motion of sediment (U c ) for the bed material was evaluated using standard methods which have been described in previous works [13,19]. the scour hole; when 48 h had elapsed, the system had evolved to generate two clockwise vortices and one smaller counterclockwise vortex [24].…”

Section: Methodsmentioning

confidence: 99%

“…There have been several experimental investigations into the progression of local scour under particular hydraulic conditions [20][21][22][23][24]. It has generally been established that scour depth increases rapidly in the early stages of the scour process, and the relationship between elapsed time and scour depth becomes asymptotic as the point of equilibrium is approached.…”

Section: Time Scale Of Local Scourmentioning

confidence: 99%

“…Guan et al [24] acquired particle image velocimetry (PIV) measurements in the flow field surrounding a cylinder during the process of local scour. Bed measurements and PIV measurements were taken at various times up to a point of equilibrium, from which the evolution of the horseshoe vortex system was investigated.…”

Section: Time Scale Of Local Scourmentioning

confidence: 99%

“…Bed measurements and PIV measurements were taken at various times up to a point of equilibrium, from which the evolution of the horseshoe vortex system was investigated. At 0.5 h, one clockwise vortex was observed near the leading face of the scour hole; when 48 h had elapsed, the system had evolved to generate two clockwise vortices and one smaller counterclockwise vortex [24].…”

Section: Time Scale Of Local Scourmentioning

confidence: 99%

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Examination of Blockage Effects on the Progression of Local Scour around a Circular Cylinder

Williams

Balachandar

Bolisetti

2019

Water

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An evaluation of scour estimation methods has indicated that the effects of blockage ratio are neglected in both scour modelling and development of new predictive methods. The role of channel blockage on the mechanism and progression of local scour is not well understood, and further analysis is required in order to incorporate this effect into scour estimation. In the present investigation, local scour experiments were carried out under varying blockage ratio. The results were compared with data from literature in order to explore the effects of blockage ratio (D/b, where D is the pier diameter, and b is the channel width) on equilibrium scour depth (d se /D, where d se is the depth of scour at equilibrium). It was determined that D/b had a small influence on both d se /D and the progression of scour depth (d s /D) when relative coarseness D/d 50 < 100 (where d 50 is the median diameter of sediment), and that the influence appeared to be amplified when D/d 50 > 100. The efficacy of scour estimation methods used to predict the progression of local scour was also dependent on D/d 50 . A method of scour estimation used to predict d se /D was evaluated, and it was similarly found to be particularly effective when D/d 50 < 100. In future work, further experiments and analysis in the range of D/d 50 > 100 are required in order to establish the role of D/b under prototype conditions and to refine existing scour estimation methods.

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Section: Methodsmentioning

confidence: 99%

Section: Time Scale Of Local Scourmentioning

confidence: 99%

Section: Time Scale Of Local Scourmentioning

confidence: 99%

Section: Time Scale Of Local Scourmentioning

confidence: 99%

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Examination of Blockage Effects on the Progression of Local Scour around a Circular Cylinder

Williams

Balachandar

Bolisetti

2019

Water

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“…Strong ejections and uplift events were observed in the region just behind the cylinder. Recently, the evolution of the HSV in a scour hole around a circular pile was studied by Guan et al [24] using 2D Particle Image Velocimetry (PIV) technique. The results indicated that the horseshoe vortex system evolves from one initial small vortex to three vortices along the upstream slope of the developing scour hole.…”

Section: Local Scour Around a Monopile 21 General Description And Scmentioning

confidence: 99%

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Qi¹,

Gao²

2020

Geotechnical Engineering - Advances in Soil Mechanics and Foundation Engineering

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Monopile is the most commonly used foundation type for offshore wind turbines. The local scour at a monopile foundation generated by the incoming shear flow has significant influence on both quasi-static lateral responses and dynamic responses of the monopile. This chapter focuses particularly on characterizing the local scour in both spatial and temporal scales and revealing the scour mechanisms associated with the flow field around a monopile. The predicting methods for the equilibrium scour depth and the time scale of scour are detailed under various representative flow conditions in the marine environment. The scale effect while extrapolating the results of model tests to prototype conditions is highlighted. The local scour imposes significant influence not only on the deformation and stiffness of the monopile foundation, but also on the natural frequency and fatigue life of the structure system. Monopiles with diameters up to 10 m have become a feasible option as the industry is currently advancing into deeper waters. More meticulous considerations for monopile design associated with the scour depth prediction and evaluation of scour effects are still in need to efficiently minimize the cost while remaining safety simultaneously.

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Junction Flow Around Cylinder Group on Flat Platee

Voskoboinick

Gorban

Voskoboinick

et al. 2020

Understanding Complex Systems

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Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier

Cited by 103 publications

References 27 publications

Examination of Blockage Effects on the Progression of Local Scour around a Circular Cylinder

Examination of Blockage Effects on the Progression of Local Scour around a Circular Cylinder

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Junction Flow Around Cylinder Group on Flat Platee

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