On the Aerodynamic Force Acting on a Circular Cylinder in the Critical Range of the Reynolds Number

Kamiya, Nobuhiko; Suzuki, Shuji; Nishi, Toshizo

doi:10.2514/6.1979-1475

Cited by 27 publications

(9 citation statements)

References 2 publications

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“…It may be inferred that the bistable flow at T/D ¼ 0.32-0.45 is linked to the formation and burst of the separation bubble. Such a kind of the formation and burst of the separation bubble, the bistable nature of the flow, resembles in a way the laminarseparation/ turbulent-reattachment bubble formed on one side of an isolated cylinder at a critical Reynolds number (Bearman, 1969;Kamiya et al, 1979;Farrel and Blessmann, 1983;Schewe, 1983;Almosnino and McAlister, 1984). It is noteworthy that modes A, B and C, at T/D ¼ 0.10, 0.30 and 0.50, respectively, are mainly characterized by the behavior of the gap flow between the cylinders.…”

Section: Staggered Arrangement With a ¼ 251mentioning

confidence: 95%

Determination of flow configurations and fluid forces acting on two staggered circular cylinders of equal diameter in cross-flow

Alam

Sakamoto

Zhou

2005

Journal of Fluids and Structures

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Section: Staggered Arrangement With a ¼ 251mentioning

confidence: 95%

Determination of flow configurations and fluid forces acting on two staggered circular cylinders of equal diameter in cross-flow

Alam

Sakamoto

Zhou

2005

Journal of Fluids and Structures

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“…Although not clearly written in the paper by Schewe, this should mean that the wake was oriented towards the same side as the lift i.e. the side where the single separation bubble would form, since the presence of a single separation bubble shifts the stagnation point towards the opposite cylinder shoulder (Kamiya et al (1979)). In the following, this phenomenon is studied further as the wake flow structure at different boundary layer transition states is presented for the static cylinder based on the Cobra Probe measurements taken 2.5D downstream of the cable from the centre line at ring 3 and 5 mm inwards from the side of the cable with the helical fillet nearly normal to the flow.…”

Section: Fluctuations Of Surface Pressuresmentioning

confidence: 99%

Aerodynamics of a stay cable with helical fillets - Part II: Fluctuating load and wake characteristics

Christiansen

Jakobsen

Macdonald

et al. 2018

Journal of Wind Engineering and Industrial Aerodynamics

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This paper presents the fluctuating load and wake characteristics of a bridge stay cable model with helical fillets in smooth flow at high Reynolds numbers. Over the Reynolds numbers tested, the frequency content of the lift coefficient in individual pressure tap rings, was dominated by low frequencies. At lower Reynolds numbers, these were caused by single separation bubble instabilities. At smaller spectral magnitudes, a vortex shedding process was observed, with a local Strouhal number dependent on the angular position of the helical fillet nearly normal to flow. For the average over the four rings, the low frequencies cancelled out, and left a high frequency vortex shedding process with a Strouhal number of 0.19 as the prominent load. The Strouhal number was maintained throughout the Reynolds number range tested. In dynamic tests, the pressure distribution was found to periodically rotate relative to the cable circumference at the natural frequency of the cable. Also, when observing the velocity components in the wake, a periodic motion of the wake synchronised with the cable motion was revealed. In static tests, the wake field instantly displaced towards the same side as the lift force generated by the asymmetric pressure distribution during boundary layer instabilities.

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“…9, was apparently caused by roughness effects. 15 Fig-4, is a nonuniform sideforce distribution caused by unevenly distributed roughness. Uniform roughness has been shown to inhibit the flat-spin development 9 (Fig.…”

Section: Roughness Effectsmentioning

confidence: 99%

Flat spin of axisymmetric bodies

Ericsson¹,

Beyers²

1995

Journal of Aircraft

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Experimental results are analyzed to develop an understanding of the flow physics causing flat spin of axisymmetric bodies, which is a key to the development of the capability for the prediction of the flat spin of advanced aircraft. The flow phenomenon sustaining the flat spin motion is the flow separation asymmetry due to the moving wall effect at locally critical flow conditions on the body, which is made possible by the presence of three-dimensional flow effects. Body roughness and microasymmetry play important roles in extending the range of ambient flow conditions at which flat spin can develop.

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On the Aerodynamic Force Acting on a Circular Cylinder in the Critical Range of the Reynolds Number

Cited by 27 publications

References 2 publications

Determination of flow configurations and fluid forces acting on two staggered circular cylinders of equal diameter in cross-flow

Determination of flow configurations and fluid forces acting on two staggered circular cylinders of equal diameter in cross-flow

Aerodynamics of a stay cable with helical fillets - Part II: Fluctuating load and wake characteristics

Flat spin of axisymmetric bodies

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