Flow past a circular cylinder over a free surface: Interaction between the near wake and the free surface deformation

Lee, S.J.; Daichin,

doi:10.1016/j.jfluidstructs.2004.06.006

Cited by 12 publications

(6 citation statements)

References 9 publications

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“…They also divided the near-wake region into three regimes: the formation of a Coanda flow, substantial jet-like flow generation, and jet-like flow structure attachment to the free surface. Jet-like flow topology was also identified by Lee and Daichin 257 for a circular cylinder above the water free surface with gap ratios from 0.25 to 1.25.…”

Section: Water Free Surfacementioning

confidence: 59%

A review of experiments on stationary bluff body wakes

Feshalami

Scarano

et al. 2022

Physics of Fluids

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Experimental studies dealing with the wake of isolated stationary bluff-bodies are reviewed. After briefly recalling the pioneering works in this domain, the paper focuses on recent research conducted with the latest experimental methods and techniques. The review encompasses a range of topics, including, the effects of bluff-body geometry (non-circular cross sections and nonuniformity in spanwise direction), steady and unsteady (periodic and non-periodic) inflow conditions; surface proximity (rigid wall, confinement and water free surface) and non-Newtonian fluids. Focus is brought to the flow physics of the wakes, including especially the complex threedimensional and oscillatory behaviours induced by the periodic vortex shedding phenomenon. The paper aims to offer a critical and systematic review of new knowledge and findings on the subject area, as well as emerging? and the most frequently adopted experimental techniques. The review also helps identifying knowledge gaps in the literature that need to be addressed in future investigations.

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Section: Water Free Surfacementioning

confidence: 59%

A review of experiments on stationary bluff body wakes

Feshalami

Scarano

et al. 2022

Physics of Fluids

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“…The tracking of the free surface was accomplished by the volume-of-fluid method and complies with the mass conserving method. The volume fraction of the water was obtained from conservation Equation (5). The function F in Equation 5is defined so that its value is in unity at any point occupied by the water and zero otherwise.…”

Section: Governing Equation and Solution Methodsmentioning

confidence: 99%

“…Some previous studies of the free surface provide useful references for the present study [3][4][5]. Chaplin et al [6] investigated the steady flow past a vertical surface-piercing circular cylinder.…”

Section: Introductionmentioning

confidence: 99%

Free Surface Characteristics of Flow around Two Side-by-Side Circular Cylinders

Yang

et al. 2018

JMSE

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The three-dimensional free surface characteristics of flow around two equal diameter cylinders in a side-by-side arrangement were studied numerically. The flow fields were simulated with a three-dimensional finite volume method based on the RNG k-ε model for Reynolds number Re = 1.0 × 10 4. The volume-of-fluid method was applied to track air-water interfaces. Computations were performed for gap ratios of 1.25, 1.5, and 1.75 to examine the influence of the gap between two cylinders, and for distance to diameter ratios of 8.0 and 1.0 to study the wall proximity effects. The model was verified by comparing it with the other numerical and experimental results. The results indicated that the evolution of the free surface was periodic in time scale. A weak hydraulic jump occurs in the wake flow. Moreover, a significant difference between upstream and downstream free surface elevations exists in the vicinity of the cylinder. A runup in front of the cylinder and a 'depression' around the side edge were also observed. Computational results showed that the flow near the two cylinders was pushed outwards, and the flow between the cylinder and the wall was deflected inwards by the wall. The vortex structures on and near the free surface were closely correlated with the free surface. The shedding vortex far from the free surface was not affected.

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“…The eddy viscosity is related to the turbulent kinetic energy and its dissipation rate, (5) in which (6)…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Most recently, Wilson et al [5] reviewed and studied laminar and turbulent flow over a single cylinder and across in-line and staggered tube banks. Lee and Daichin [6] and Akilli et al [7] conducted experimental and numerical investigations of flows over cylinders. Furthermore, large eddy simulation calculations are conducted by Elyyan and Tafti [8] for flow in a channel with dimples on opposite walls with both surfaces heated at three Reynolds numbers, 220, 940, and 9300, ranging from laminar, weakly turbulent, to fully turbulent, respectively.…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation of Flow Fields and Erosion in a Dimpled Channel

Al-Hajeri

Alhajeri

2009

The Journal of Computational Multiphase Flows

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A numerical prediction of flow in a dimpled channel is reported. The flow regimes considered cover a wide range of Reynolds numbers, which range from 380 to 99000 and which are equivalent to a range of inlet velocities from very low (0.072 m/s) to very high (60 m/s). In this study, calculations were made using the standard k-e model with standard wall function. The drag coefficient, skin friction drag, pressure drag, and pressure distribution around a dimple were investigated. As the velocity increased, the drag coefficient decreased until the velocity exceeded 45 m/s, after which it increased. Furthermore, the pressure drag and skin friction drag depend on the velocity. Particles with a density of 2440 kg/m 3 and a diameter of 100 microns were tracked through the domain to estimate the frequency, velocity, and angle of impact of the particles and to estimate the resulting erosion rate. It was found that the maximum erosion rate occurred between 40 and 65 degrees from the leading edge of the dimple. Furthermore, a computational study of the flow fields of three dimples in an in-line arrangement is presented. This study showed that similar flow behaviours exist between the first and second dimples and that the flow behaviours are identical between the second and third cylindrical dimples.

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Flow past a circular cylinder over a free surface: Interaction between the near wake and the free surface deformation

Cited by 12 publications

References 9 publications

A review of experiments on stationary bluff body wakes

A review of experiments on stationary bluff body wakes

Free Surface Characteristics of Flow around Two Side-by-Side Circular Cylinders

Computational Investigation of Flow Fields and Erosion in a Dimpled Channel

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