Vortex dynamics of a cylinder wake in proximity to a wall

Sarkar, Subhadeep

doi:10.1016/j.jfluidstructs.2009.08.003

Cited by 93 publications

(47 citation statements)

References 39 publications

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“…Vortex shedding is significantly suppressed for G/D < 0.3, [30]. This is confirmed in the present study through a very by [7], [9] and [11], as well as the numerical results of [23] and [27], show very good agreement with this study. For the narrower gaps, the St discrepancy is large.…”

Section: Influence Of the Gap (G/d)supporting

confidence: 91%

“…For the narrower gaps, the St discrepancy is large. PIV measurements by [7] for Re = 4900 and LES by [27] for low Re = 1440 captured a decrease of St with increasing gap, similar to the present study. Farther downstream in the wake, the velocity profiles for G/D = 1 retain symmetry.…”

Section: Influence Of the Gap (G/d)supporting

confidence: 90%

“…The 2D simulations, however, are shown not to be suitable for the flow at higher Re (Re ≥ 1000), where the flow is turbulent and 3D. While the By using a 3D LES, similar flow was successfully modelled in [27] with a three diameter wide domain in spanwise direction. The study was, however, done for the lower Re of 1400.…”

Section: Cylinder In the Vicinity Of A Wall -Convergence Studiesmentioning

confidence: 96%

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Large Eddy Simulations of flow around a circular cylinder close to a flat seabed

et al. 2016

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Large Eddy Simulations (LES) with Smagorinsky subgrid scale model are used to study the turbulent flow and wake dynamics behind a circular cylinder close to a horizontal, plane wall at subcritical Reynolds number. The focus is on investigating the details of the flow around the cylinder placed at different distances from the wall and immersed in boundary layers of various thicknesses.The Reynolds number is Re = 13100. The simulations with gap to diameter ratios (G/D) of 0.2, 0.6 and 1 are carried out in order to investigate the changes of the flow field and the vortex shedding due to the presence of the plane wall. The influence of the incoming boundary layer profile is investigated through simulations with logarithmic boundary layer inlet profile of thickness 0.48D and 1.6D, and compared with a uniform inlet flow profile. 2D and 3D simulations are performed for Re ranging from 100 to 13100, to explore the importance of the flow three-dimensionality. The flow field in the cylinder wake, as well as the mean flow values, the spectral analysis and the pressure distribution on the cylinder surface are computed to study the flow physics due to the influences of the wall.

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Section: Influence Of the Gap (G/d)supporting

confidence: 91%

Section: Influence Of the Gap (G/d)supporting

confidence: 90%

Section: Cylinder In the Vicinity Of A Wall -Convergence Studiesmentioning

confidence: 96%

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Large Eddy Simulations of flow around a circular cylinder close to a flat seabed

et al. 2016

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“…As indicated in the figure 5, k-ɷ SST turbulence model capture all the primary as well as secondary bubbles in both upstream and downstream direction. As in case of the LES simulation performed by S. Sarkar et al [3], the upstream bubbles gets reduces in size as the gap ratio increases in case of the present RANS simulation also. Furthermore, it has been observed that the rapid increase in the size of the primary bubble in the downstream direction, as the gap ratio increases.…”

Section: Resultssupporting

confidence: 60%

“…Such a system is of lower importance and has not been explored much. S. Sarkar et al [3], studied vortex dynamics of a wake formed by circular cylindrical object near to a plate boundary at Reynolds number equal to 1440, for the different gap ratios (G/D) (G is the gap between the wall and the cylindrical object, and D is the hydraulic diameter) by means of LES simulation. The use of the LES simulation is very costly and time consuming.…”

Section: Introductionmentioning

confidence: 99%

Vortex dynamics and elliptical structure wake interaction in the proximity of wall using 2-D RANS simulation

2018

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Abstract:The 2-D numerical study is performed to analyses the flow characteristic behind the elliptical structure placed near the wall for three different gap ratios as 0.25, 0.5, and 1.0. Computational domain and model is initially validated with the unbounded flow over a cylinder without considering wall effect for Reynolds number of 3900. For flow over the cylinder with near wall, computational domain is modelled as Blasius profile is the input to the area of interest. At different gap ratios the effect of boundary layer on vortex shedding is studied with Reynolds number of 1440. By applying different turbulent model for analysis, study the variation in the results and suggest the suitable model for the present type of study. It has been observed that the wall effect is predominant in case of the gap ratio of 0.25 as compared to other gap ratios.

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Large Eddy Simulation of Flows of Engineering Interest: A Review

Sarkar

2020

50 Years of CFD in Engineering Sciences

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Vortex dynamics of a cylinder wake in proximity to a wall

Cited by 93 publications

References 39 publications

Large Eddy Simulations of flow around a circular cylinder close to a flat seabed

Large Eddy Simulations of flow around a circular cylinder close to a flat seabed

Vortex dynamics and elliptical structure wake interaction in the proximity of wall using 2-D RANS simulation

Large Eddy Simulation of Flows of Engineering Interest: A Review

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