Vortex shedding and three-dimensional behaviour of flow past a cylinder confined in a channel

Griffith, Martin D.; Leontini, Justin; Thompson, Mark C.; Hourigan, Kerry

doi:10.1016/j.jfluidstructs.2011.02.007

Cited by 63 publications

(34 citation statements)

References 7 publications

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“…On the other hand, it is well-known that even a confined non-wavy cylinder may lead to significant flow differences. This had been reported by recent studies such as those performed by Zovatto and Pedrizzetti (2001), Sahin and Owens (2004), Rehimi et al (2008), Camarri and Giannetti (2010), Singha and Sinhamahapatra (2010), Kanaris et al (2011), Rehimi and Aloui (2011) and Griffith et al (2011), among others. In general, at small Reynolds numbers and blockage-ratios, recirculating wake bubble aft of a confined cylinder will reduce in length as the blockage-ratio increases.…”

Section: Introductionsupporting

confidence: 73%

On the flow behaviour of confined finite-length wavy cylinders

New

Shi

Liu

2015

Journal of Fluids and Structures

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Section: Introductionsupporting

confidence: 73%

On the flow behaviour of confined finite-length wavy cylinders

New

Shi

Liu

2015

Journal of Fluids and Structures

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“…The wakes of finite circular cylinders in cross-wind are dominated by the velocity fluctuations induced by the alternate vortex shedding from the body sides, as documented by Farivar (1981), Ayoub and Karamcheti (1982), Fox et al (1993), Bearman (2011), Griffith et al (2011), Suthon and Dalton (2011) and Visscher et al (2011), in which the presence of clear vortex shedding from most of the cylinder span, with frequencies of the same order as those typical of twodimensional flow, was found for models with aspect-ratio h=d 4 10 (where h is the cylinder height and d its diameter). However, a decrease of the frequency was found in a zone approaching the upper end of the cylinders, probably due to an increase in the formation length of the shed vortices.…”

Section: Introductionmentioning

confidence: 90%

Experimental investigation on the aerodynamic loads and wake flow features of a low aspect-ratio circular cylinder

Iungo

Pii

Buresti

2012

Journal of Fluids and Structures

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a b s t r a c tAn experimental investigation on the flow features of the wake generated from a circular cylinder with finite height and placed vertically on a plane is presented. Through force measurements the mean drag coefficient is found to be roughly invariant by varying Reynolds number in a range between 6 Â 10 4 and 11 Â 10 4 . As for the fluctuating forces, a dominant spectral component is clearly detected for the signals of the cross-flow force. A spectral contribution with roughly the same Strouhal number is detected from velocity signals acquired, through hot-wire anemometry, in proximity to the lateral wake boundary; its energy is found to decrease by moving the probe away from the wake and upwards. Simultaneous velocity measurements showed that these fluctuations can confidently be ascribed to an alternate vortex shedding. Subsequently, dynamic measurements of the pressure field over the lateral surface and the free-end of the model were carried out, which highlight that the spectral component connected to vortex shedding is found over the lateral surface, with maximum energy at an azimuthal position just before the separation of the shear layers. The fluctuating energy connected to vortex shedding decreases by moving towards regions immersed in the separated wake, and with increasing vertical coordinate; as a matter of fact, above about half model height an evident energy peak cannot be detected anymore. This feature highlights that a regular alternate vortex shedding occurs only for the lower half-span of the model and that the remaining part is dominated by the upwash generated by the flow passing over the free-end. From the spectral analysis of the pressure measurements carried out over the model free-end no evidence of the presence of the spectral component connected to the alternate vortex shedding is found, as expected. However, a significant fluctuating energy is observed at lower dominating frequencies.

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“…The details of the method can be found in Thompson et al (2006Thompson et al ( , 1996, and a description of the spectral element method in general can be found in Karniadakis and Sherwin (2005). This code has been very well validated in a variety of fluid-structure interaction problems similar to that studied in this paper (Leontini et al, 2007Griffith et al, 2011;Leontini and Thompson, 2013).…”

Section: Parameters Usedmentioning

confidence: 99%