Development of the wake behind a circular cylinder impulsively started into rotatory and rectilinear motion

Chen, Yen-Ming; Ou, Y.-R.; Pearlstein, Arne J.

doi:10.1017/s0022112093001867

Cited by 78 publications

(54 citation statements)

References 53 publications

(41 reference statements)

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“…Much of the prior work has dealt with the case of a steadily rotating (no forced oscillations) and translating circular cylinder (see for example Badr & Dennis 1985;Badr et al 1986Badr et al , 1990Coutanceau & Menard 1985;Chang & Chern 1991;Chen, Ou & Pearlstein 1993;Nair, Sengupta & Chauhan 1998). The work by Badr et al (1990) is a joint theoretical and experimental study in the Reynolds number range 10 3 6 R 6 10 4 and for rotational to translational surface speed ratios between 0.5 and 3.…”

Section: Introductionmentioning

confidence: 99%

The flow induced by a rotationally oscillating and translating circular cylinder

2000

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The temporal development of two-dimensional viscous incompressible flow induced by an impulsively started circular cylinder which performs time-dependent rotational oscillations about its axis and translates at right angles to this axis is investigated. The investigation is based on the solutions of the unsteady Navier-Stokes equations. A series expansion for small times is developed. The Navier-Stokes equations are also integrated by a spectral-finite difference method for moderate values of time for both moderate and high Reynolds numbers. The numerical method is checked with the results of the analytical solution. The effects of the Reynolds number and of the forcing Strouhal number S on the laminar asymmetric flow structure in the near-wake region are studied. The lift and drag coefficients are also extracted from numerical results. An interesting phenomenon has been observed both in the flow patterns and in the behaviour of drag coefficients for S = π/2 at Reynolds number R = 500 and is discussed. For comparison purposes the start-up flow is determined numerically at a low Reynolds number and is found to be in good agreement with previous experimental predictions.

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Section: Introductionmentioning

confidence: 99%

The flow induced by a rotationally oscillating and translating circular cylinder

2000

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“…A new numerical approach is used in this work. This approach is based on an explicit finite-difference/pseudo-spectral technique, and uses a new implementation of the Biot-Savart law to produce accurate solutions to the governing equations [4].…”

Section: Summary Of Resultsmentioning

confidence: 99%

“…The ability to tailor tile wake of a bluff body could be used to reduce drag, increase mixing or heat transfer and enhanced combustion. In [4] we studied the fundamental problems associated with the development of the alternate shedding of vortices in the cylinder wake for several values of constant rotation.…”

Section: Summary Of Resultsmentioning

confidence: 99%

An Unsolicited Proposal for Modeling, Identification, and Active Control of Fluid Dynamics

Voigt¹

1992

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“…Ingham and Tang [1] carried out numerical simulations for twodimensional steady flow, extending their previous research work to Re = 60 and 100 for 0 ≤ α ≤ 1. Another numerical attempt at Re = 200 was reported by Chen et al [2]. An explicit pseudo-spectral technique was adopted for resolving the fundamental equations.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Nanofluid Flow Around a Rotating Cylinder

Khelili¹,

Abderazzak²

2018

Studia UBB Chemia

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ABSTRACT. The forced convective flow and heat transfer of nanofluids past a rotating cylinder placed in a uniform cross stream is investigated numerically. The computations are carried out at a representative Reynolds number (Re) of 200. The dimensionless cylinder rotation rate (α) is varied between 0 and 6. The range of nanoparticle volume fractions (φ) considered is 0 ≤ φ ≤ 5%. Two-dimensional and unsteady mass continuity, momentum, and energy equations have been discretized using finite volume method. SIMPLE algorithm has been applied for solving the pressure linked equations. The effect of rotation rates (α) on fluid flow and heat transfer were investigated numerically. In addition, time-averaged (lift and drag coefficients and Nusselt number) results were obtained and compared with the literature data. A good agreement was obtained for both the local and averaged values. INTRODUCTIONThe classical problem of viscous incompressible flow over a circular cylinder confined in a channel is one of the most widely studied problems in computational fluid dynamics (CFD). This type of flow problems frequently arise in various engineering fields. Because of its popularity, a plethora of numerical, theoretical and experimental results are available for this problem in the literature. . An explicit pseudo-spectral technique was adopted for resolving the fundamental equations. According to their results, when α = 3.25 more than one vortex is shed downstream. Kang [3] also has contributed significant work to this research area. Sequential numerical simulations at Re equal to 40, 60, 100 and 160 in the range of 0 ≤ α ≤ 2.5 were performed. It was observed that at 60 ≤ Re ≤ 160 the maximum value of a, which favors flow instability, varies logarithmically when plotted against Re. Zdravkovich [4], has compiled almost all the experimental, analytical and numerical simulation data on flow past cylinders,In the study of wake dynamics, bluff body rotation has always drawn considerable attention largely due to its effects on boundary layer separation and the Magnus effect. Increase in the lift magnitude more than classic Prandtl's limit due to increase in rotation rate of the circular cylinder was proposed by Glauart [5]. For the similar flow configuration, Kang and Choi [6], followed with the numerical solution of the unsteady governing equations in the primitive variables velocity and pressure for flows with Re = 60, 100 and 160 with 0 = α = 2.5. Their results showed that vortex shedding vanishes when α increases beyond a critical value which follows a logarithmic dependence on the Reynolds number (e.g., the critical dimensionless rotation rate α = 1.9 for Re = 160). Later, the work of (Mittal & Kumar, [7]) performed a comprehensive numerical investigation by fixing a moderate value of Re = 200 while considering a wide interval for the dimensionless rotation rate of 0 ≤ α ≤ 5. They used the finiteelement method to solve the unsteady incompressible Navier-Stokes equations in two-dimensions for the primitive variables velocity and ...

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Development of the wake behind a circular cylinder impulsively started into rotatory and rectilinear motion

Cited by 78 publications

References 53 publications

The flow induced by a rotationally oscillating and translating circular cylinder

The flow induced by a rotationally oscillating and translating circular cylinder

An Unsolicited Proposal for Modeling, Identification, and Active Control of Fluid Dynamics

Heat Transfer Characteristics of Nanofluid Flow Around a Rotating Cylinder

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