Numerical study of fluid flow past a rotating elliptic cylinder

Naik, Sandeep N.; Vengadesan, S.; Prakash, K. Arul

doi:10.1016/j.jfluidstructs.2016.09.011

Cited by 27 publications

(3 citation statements)

References 29 publications

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“…Lua et al (2010) firstly reported the phenomenon that AV could stay above the foil for a period of time if the rotation speed is large enough, and they named it as ''hovering vortex''. This phenomenon has also been confirmed by later studies (Hu 2015, Naik et al 2017. Here we attribute this phenomenon to the variation of η = T s /T c , i.e.…”

Section: Vortex Shedding Characteristicssupporting

confidence: 89%

“…It was confirmed that there exists periodic vortex shedding pattern (vortex rings in three dimension) at low rotating speeds, while vortices may cluster near the wing when rotating speed is high enough. Naik et al (2017) performed a computational study for the effect of thickness ratio (ratio between major and minor axis of an elliptic cylinder) on the vortex shedding and aerodynamics of a rotating elliptic cylinder. They found lift decreases monotonically, but drag decreases first and then increases with thickness ratio.…”

Section: Introductionmentioning

confidence: 99%

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An elliptic foil rotating in uniform low-Reynolds-number flows

Hu¹,

Tang²

2020

Fluid Dyn. Res.

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A computational study is conducted to systematically investigate the effect of rotating speed on vortex shedding characteristics and far-field wake patterns of an elliptic foil rotating in uniform cross flows at low Reynolds numbers. It is found that at low rotating speed, vortices shed at the advancing and retreating edges of the foil could form a strong vortex pair in the wake. At high rotating speed, adjacent vortices are closer to each other, thus may evolve into a single vortex. The far-field wake pattern also strongly depends on the rotating speed and demonstrates complex behaviors. It is observed that the wake can defect from downwards to upwards by increasing the rotating speed. The mean lift force increases monotonically with the rotating speed, while a significant drag reduction occurs at a small rotating speed, which is explained by the corresponding wake pattern. Furthermore, a rotating speed regime exists in which the mean aerodynamic torque is positive so that the rotation of the foil could be solely promoted by the flow, indicating a possibility of flow energy harvesting in this regime.

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Section: Vortex Shedding Characteristicssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

An elliptic foil rotating in uniform low-Reynolds-number flows

Hu¹,

Tang²

2020

Fluid Dyn. Res.

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“…They stated that for a constant Re number, the wake length increases with the increasing degree of shear-thinning behavior and the degree of symmetry and in this situation, the flow transits to an unsteady regime. Naik et al [26] demonstrated the flow pattern around a rotating elliptic cylinder at Re = 100. They revealed that the lift coefficient increases with increasing RS and decreases with increasing the cylinder aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heat and fluid flow around two co-rotating side-by-side cylinders

Hassanzadeh

Darvishyadegari

2019

Sādhanā

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Analysis of the heat and fluid flow around two co-rotating side-by-side cylinders is the subject of this numerical study which is done at constant Reynolds and Prandtl numbers of 200 and 7.0, respectively. Both cylinders rotate in the counterclockwise direction with an identical rotating speed (RS) in the range from 0 to 4. On the other hand, several gap spaces between the rotating cylinders such as G/D = 1.5, 2.0, and 3.0 are considered in the present study. The obtained results are validated against the available data in the open literature. Many different results have been reported in this investigation. It is observed that co-rotating the cylinders deforms the wake region downstream of both cylinders which the vortex strength of the lower cylinder against the rotation is stronger than that of the upper cylinder. On the other hand, co-rotating the cylinders develops a negative lift force on both cylinders. Finally, it was concluded that rotating the side-by-side cylinders reduces the heat transfer rate between the fluid flow and cylinders in general. At whole RS and G/D values, the heat transfer rate of the upper cylinder is realized to be less than that of the lower cylinder. adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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Comparing the wake behind circular and elliptical cylinders in a uniform current

Yazdi

Khoshnevis

2020

SN Appl. Sci.

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Numerical study of fluid flow past a rotating elliptic cylinder

Cited by 27 publications

References 29 publications

An elliptic foil rotating in uniform low-Reynolds-number flows

An elliptic foil rotating in uniform low-Reynolds-number flows

Analysis of heat and fluid flow around two co-rotating side-by-side cylinders

Comparing the wake behind circular and elliptical cylinders in a uniform current

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