End-wall effects on vortex shedding in planar shear flow over a circular cylinder

Huang, Zhiwei; Andersson, Helge I.; Cui, Weicheng

doi:10.1016/j.compfluid.2010.10.009

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…Huang et al [8] considered the end-wall effects on vortex shedding around a circular cylinder at Re = 100 in which they studied the difference between slip and no-slip boundary conditions on the spanwise boundaries. They found that for a cylinder of length 6D the effect of no-slip boundary conditions substantially altered the vortex shedding in the middle of the channel.…”

Section: Introductionmentioning

confidence: 99%

Influence of spanwise no-slip boundary conditions on the flow around a cylinder

et al. 2017

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First we present high resolution large eddy simulations (LES) for the flow past a circular cylinder at Reynolds number 3900 to prove the quality of the simulations. A thorough grid convergence study is presented, and the agreement in the mean flow statistics between our simulations and the references is excellent. Then we apply a no-slip boundary condition at the spanwise boundaries of the cylinder, with aspect ratios of 6, 12 and 24. This results in large changes in the shear layers and wake topology, even for an aspect ratio of 24. Even though the boundary layers along the side walls are only about 0.4 diameters thick, they nevertheless manage to stabilize the shear layers all the way through the channel, thus effectively delaying the roll-up and transition to a turbulent wake.

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Section: Introductionmentioning

confidence: 99%

Influence of spanwise no-slip boundary conditions on the flow around a cylinder

et al. 2017

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“…The configuration of planar shear flow past a cylinder is two-dimensional and has been studied extensively either experimentally, 33 or using two-dimensional numerical models, [34][35][36] or using three-dimensional models. [37][38][39] In this study, 1-dof VIV of a cylinder in the cross-flow direction in a spanwise shear flow is studied numerically. Three-dimensional incompressible Navier-Stokes equations are solved using the Petrov-Galerkin finite element method (PG-FEM) for simulating the flow.…”

Section: Ming Zhaomentioning

confidence: 99%

Numerical simulation of vortex-induced vibration of a circular cylinder in a spanwise shear flow

Zhao

2015

Physics of Fluids

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Vortex-induced vibration of a circular cylinder with a length-to-diameter ratio of 19.2 in a spanwise shear flow is investigated numerically. The Reynolds numbers based on the velocity at the centre of the cylinder and the mass ratio are 500 and 2, respectively. The responses of the cylinder in shear flows with shear factors of 0.05 and 0.1 are compared with that in the uniform flow. Although the oscillation of the lift force for a stationary cylinder in a sheared flow is very weak, it is found that if the cylinder is allowed to vibrate, the lock-in regime and the maximum response amplitude are comparable with their counterparts for a cylinder in a uniform flow. The maximum response amplitude for a shear factor of 0.05 is found slightly greater than that for a uniform flow. In the lock-in regime, the vortex shedding and the oscillation of the sectional lift coefficient are found to synchronize (have a same frequency) along the cylinder span, leading to strong vibration of the cylinder. The sectional lift coefficient changes from being in phase to being out of phase with the response displacement at a location on the cylinder span, and the location where the lift coefficient changes its phase depends on the reduced velocity. The phase change of the lift coefficient corresponds to the change in the vortex shedding mode. The role of the sectional lift coefficient in the vibration varies along the cylinder span. For a small reduced velocity in the lock-in regime, the sectional lift forces near the high-velocity end of the cylinder excite the vibration, while those at the rest of the cylinder span damp the vibration. With increasing reduced velocity, the location where the sectional lift forces excite the vibration moves towards the low-velocity end of the cylinder.

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A comparative study on effect of plain- and wavy-wall confinement on wake characteristics of flow past circular cylinder

2017

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A first attempt is made for identifying the wake characteristics of circular cylinder confined by a wavy wall at laminar flow regime. Numerical study of flow characteristics past circular cylinder with wavy-wall confinement perpendicular to cylinder axis has been carried out in the range of Reynolds number 20-100. The finite volume-based CFD solver Ansys Fluent (Version 15.0) is used for computations. The results are presented in the form of streamline plots, mean drag coefficient , flow separation angle and recirculation length. Wavywall confinement leads to highly significant changes in the cylinder wake such as the evolution of strong x-plane vortices, enhanced fluid mixing, wake suppression near the crest region and vortex stretching near the trough region on the downstream of the cylinder has been observed. Flow separation angle varies significantly along the axis of the cylinder. Increased wall shear stress on rear surface of the cylinder has also been observed. The part of vorticity magnitude as compared to strain rate has been distinguished and identified using vortex identification methods such as Q-criterion and Lambda-2 criterion.

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End-wall effects on vortex shedding in planar shear flow over a circular cylinder

Cited by 9 publications

References 15 publications

Influence of spanwise no-slip boundary conditions on the flow around a cylinder

Influence of spanwise no-slip boundary conditions on the flow around a cylinder

Numerical simulation of vortex-induced vibration of a circular cylinder in a spanwise shear flow

A comparative study on effect of plain- and wavy-wall confinement on wake characteristics of flow past circular cylinder

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