Numerical study of incompressible flow about fixed cylinder pairs

Jester, W.; Kallinderis, Y.

doi:10.1016/s0889-9746(02)00149-4

Cited by 109 publications

(75 citation statements)

References 36 publications

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“…In figure 1 the variation of the Strouhal number (St= f c / V ) with the distance between two normal flat plates is reported; here f is the frequency associated to the main peak in the power spectrum of the HWA signal and V is the free Regular Paper stream velocity; Strouhal numbers will be presented in terms of their ratio to the single plate Strouhal number, Stref, for convenience. As for other bluff bodies (Liu and Chen, 2002;Jester and Kallinderis, 2003), also in this case hysteresis or bistability is observed for intermediate distances.…”

Section: Introductionsupporting

confidence: 66%

Interacting wakes of two normal flat plates an investigation based on phase averaging of LDA signals

Auteri

Belan

Cassinelli

et al. 2009

J Vis

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The flow around two bluff bodies in tandem is an interesting phenomenon whose nature strongly depends on the distance between the bodies. In this work oil smoke visualizations of the flow around two normal flat plates in tandem configuration are compared with phase averaged Laser Doppler Anemometry measurements of the flow field for a full period. Phase averaging is exploited to resolve the mean time evolution of the flow and the signal from a single constant temperature hot wire probe is employed as phasing reference. The flow-field information obtained from visualizations agrees well with quantitative indications provided by measures, and the comparison allows to precisely understand what information can be extracted from simple visualizations. As a result, new insight in flow mechanism is obtained from the analysis of the flow data showing that, for the analyzed plate distance, the gap between the two plates behaves substantially as a cavity while the vortex formation process takes place in the wake region behind the aft plate.

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Section: Introductionsupporting

confidence: 66%

Interacting wakes of two normal flat plates an investigation based on phase averaging of LDA signals

Auteri

Belan

Cassinelli

et al. 2009

J Vis

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show abstract

“…Liu & Chen (2002) showed that this phenomenon occurs for a pair of square cylinders in tandem and Zdravkovich (1977) suggested this possibility may occur for circular cylinders. Additionally, numerical studies performed by Jester & Kallinderis (2003) for Re = 10 3 , Papaioannou et al (2006) for Re = 10 2 -10 3 and Carmo, Meneghini & Sherwin (2010a,b) for Re = 500 also provide a clear demonstration of the hysteresis of both regimes in relation to Re and x 0 . All these aforementioned factors may cause the critical separation to present considerable variation.…”

Section: Introductionmentioning

confidence: 83%

On the wake-induced vibration of tandem circular cylinders: the vortex interaction excitation mechanism

2010

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The mechanism of wake-induced vibrations (WIV) of a pair of cylinders in a tandem arrangement is investigated by experiments. A typical WIV response is characterized by a build-up of amplitude persisting to high reduced velocities; this is different from a typical vortex-induced vibration (VIV) response, which occurs in a limited resonance range. We suggest that WIV of the downstream cylinder is excited by the unsteady vortex-structure interactions between the body and the upstream wake. Coherent vortices interfering with the downstream cylinder induce fluctuations in the fluid force that are not synchronized with the motion. A favourable phase lag between the displacement and the fluid force guarantees that a positive energy transfer from the flow to the structure sustains the oscillations. If the unsteady vortices are removed from the wake of the upstream body then WIV will not be excited. An experiment performed in a steady shear flow turned out to be central to the understanding of the origin of the fluid forces acting on the downstream cylinder.Key words: flow-structure interactions, vortex flows, wakes/jets IntroductionGreat strides have been made in understanding the mechanisms involved in vortexinduced vibration (VIV) of an isolated circular cylinder free to vibrate transverse and/or in-line to a fluid flow. Progress has been reviewed by Sarpkaya (1979Sarpkaya ( , 2004, Bearman (1984), Parkinson (1989), Blevins (1990) and Williamson & Govardhan (2004). With the development of offshore oil fields and the deployment of riser pipes, much of the research related to cylinder response focused on conditions with low mass ratio m * and damping ζ . Here, m * is the ratio of mass per unit length of the structure, m, to fluid displaced, ρπD 2 /4, where ρ is fluid density, D is cylinder diameter and ζ is structural damping expressed as a fraction of critical damping. This research revealed a number of extremely interesting phenomena associated with VIV of isolated cylinders.However, there are many flow-induced vibration (FIV) problems that involve two or more cylinders in configurations where the flow field of one cylinder influences

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“…The simple two cylinders configuration has been discussed extensively and it represents a starting point to study the flow around multiple bluff bodies (Ben Meftah and Mossa 2013, Chan et al 2011, Jester and Kallinderis 2003, Prasanth and Mittal 2009, S. Mittal and Kumar 2001, Sharman et al 2005, Sumner et al 2000. According to the literature, a well-known drag inversion separation has been identified.…”

Section: Introductionmentioning

confidence: 99%

“…A spacing larger than the drag inversion separation makes positive the downstream cylinder drag coefficient and a vortex shedding in the gap between the cylinders appears. This flow is induced by the influence of both the cylinders and it is called wake interference (Jester and Kallinderis 2003). Sharman et al 2005 studied numerically the flow around two tandem circular cylinders at Re = 100 for the spacing ratio between 2 and 10 finding the drag transition between 3.75 and 4.…”

Section: Introductionmentioning

confidence: 99%

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

Fornarelli¹,

Oresta²,

Lippolis³

2015

JPHMT

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Numerical study of incompressible flow about fixed cylinder pairs

Cited by 109 publications

References 36 publications

Interacting wakes of two normal flat plates an investigation based on phase averaging of LDA signals

Interacting wakes of two normal flat plates an investigation based on phase averaging of LDA signals

On the wake-induced vibration of tandem circular cylinders: the vortex interaction excitation mechanism

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

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