Computation of Force on a Cylinder in a Shear Flow

Xu, Yanwen; Dalton, Charles

doi:10.1006/jfls.2001.0390

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…This is an indication of the existence of three-dimensional vortices in the wake of the cylinder that stretch nonuniformly. The formation of vortices in the wake of a circular cylinder was examined by Xu and Dalton [24] using LES with results that are quite similar to those obtained here.…”

Section: Resultssupporting

confidence: 73%

Three-Dimensional Turbulent Vortex Shedding From a Surface-Mounted Square Cylinder: Predictions With Large-Eddy Simulations and URANS

Younis

Abrishamchi

2014

Journal of Fluids Engineering

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The paper reports on the prediction of the turbulent flow field around a three-dimensional, surface mounted, square-sectioned cylinder at Reynolds numbers in the range 104–105. The effects of turbulence are accounted for in two different ways: by performing large-eddy simulations (LES) with a Smagorinsky model for the subgrid-scale motions and by solving the unsteady form of the Reynolds-averaged Navier–Stokes equations (URANS) together with a turbulence model to determine the resulting Reynolds stresses. The turbulence model used is a two-equation, eddy-viscosity closure that incorporates a term designed to account for the interactions between the organized mean-flow periodicity and the random turbulent motions. Comparisons with experimental data show that the two approaches yield results that are generally comparable and in good accord with the experimental data. The main conclusion of this work is that the URANS approach, which is considerably less demanding in terms of computer resources than LES, can reliably be used for the prediction of unsteady separated flows provided that the effects of organized mean-flow unsteadiness on the turbulence are properly accounted for in the turbulence model.

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Section: Resultssupporting

confidence: 73%

Three-Dimensional Turbulent Vortex Shedding From a Surface-Mounted Square Cylinder: Predictions With Large-Eddy Simulations and URANS

Younis

Abrishamchi

2014

Journal of Fluids Engineering

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“…The subgrid-scale turbulence model represents the effect of the unresolved small scales on the large scales. Many recent numerical studies, such as Beaudan and Moin (1994), Zhang (1995), Lu et al (1997), Kravchenko et al (1999) and Xu and Dalton (2001), conducted LES studies for 3-D flow past a fixed circular cylinder over a range of moderate values of Re and showed a similarity between the computed wake structures to those obtained from flow visualization studies. There have been more recent studies at higher Reynolds numbers, but these are not relevant to this effort.…”

Section: Numerical Studies Of Flow Past a Cylindermentioning

confidence: 55%

A numerical investigation of the near-wake structure in the variable frequency forced oscillation of a circular cylinder

Atluri

Rao

Dalton

2009

Journal of Fluids and Structures

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“…It has been shown by past investigations on circular cylinders, e.g. [12][13][14][15][16][17], that the flow approaching with linear shear has greatly altered the vortex dynamics in the wake when compared with that in the uniform flow case. They attributed this to the constant vorticity embedded in the free stream.…”

Section: Introductionmentioning

confidence: 99%

Interference effect of two equal‐sized square cylinders in tandem arrangement: With planar shear flow

Lankadasu

Vengadesan

2007

Numerical Methods in Fluids

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SUMMARYNumerical simulations have been performed for flow past two equal-sized square cylinders in tandem arrangement subjected to incoming planar shear flow. Effect of L/d ratio and the shear parameter has been studied. The range of L/d ratio (ratio of center-to-center distance (L) to cylinder width (d)) is varied from 2 to 7 and the non-dimensional shear parameter (K ) is varied from 0.0 to 0.4 in steps of 0.1. For all the cases the Reynolds number (Re) based on centerline velocity and cylinder width is fixed at 100. The results are compared with that of isolated square cylinder with uniform flow. Strouhal number decreases with increasing shear parameter. There are more than one shedding frequency at high shear parameters and L/d ratios. The mean drag coefficient is decreased with shear parameter and lesser than that of the single cylinder. The root mean square (RMS) value of both lift and drag coefficients is higher for the downstream cylinder for all values of shear parameter. With increasing L/d ratio, for both lift and drag, the RMS value increases and then decreases for upstream cylinder, whereas it continuously increases for the downstream cylinder. The stagnation point is moved towards the top leading edge with increasing shear. The critical L/d ratio, which is defined as the distance between two cylinders, beyond which the vortex shedding from the upstream cylinder occurs, decreases with increasing shear parameter.

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Computation of Force on a Cylinder in a Shear Flow

Cited by 11 publications

References 13 publications

Three-Dimensional Turbulent Vortex Shedding From a Surface-Mounted Square Cylinder: Predictions With Large-Eddy Simulations and URANS

Three-Dimensional Turbulent Vortex Shedding From a Surface-Mounted Square Cylinder: Predictions With Large-Eddy Simulations and URANS

A numerical investigation of the near-wake structure in the variable frequency forced oscillation of a circular cylinder

Interference effect of two equal‐sized square cylinders in tandem arrangement: With planar shear flow

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