Interference effects for groups of stacks

Gerhardt, H.J.; Kramer, Carl

doi:10.1016/0167-6105(81)90018-0

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…Igarashi and Suzuki (1984) investigated the vortex-shedding frequency, drag and ow structures of three cylinders in a longitudinal arrangement. Gerhardt and Kramer (1981) studied the static wind load and wind-induced vibrations of several arrangements of groups of stacks. Price and Paidoussis (1984) measured the aerodynamic forces on one of the three cylinders in staggered arrangements.…”

Section: Introductionmentioning

confidence: 99%

Effects of interference among three equidistantly arranged cylinders in a uniform flow

1998

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The e ects of ow interference among three identical circular cylinders, which were arranged in an equidistant triangular cluster with their axes perpendicular to the uniform ow, were studied at various incidence angles to the uniform ow and at di erent spacing ratios. The static pressures around the circumference of each cylinder were measured individually and the drag and lift coe cients of each cylinder were determined at Reynolds number of 6:2 × 10 4 based on the diameter of a single cylinder. The e ects of ow interference among the three cylinders are severe when the spacing ratios are small. When two cylinders arranged side by side are upstream of or behind the third one, the ow patterns are not symmetrical with respect to the uniform ow direction and the drag or lift coe cients of the two cylinders in the side-by-side arrangement are not always equal to each other at small spacing ratios. The inclination angles to the uniform ow strongly in uence the drag and lift coe cients, the direction of force exerted on each cylinder and the ow patterns around the cylinders. The e ects of interference among three cylinders become weak as the spacing ratios are increased.

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Section: Introductionmentioning

confidence: 99%

Effects of interference among three equidistantly arranged cylinders in a uniform flow

1998

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“…In Referring to the C P graphs of cylinder A for various values of l/d (shown in Figs. 5,6,7,8,9,10), it is found that the pressure distribution around the cylinder is nearly always symmetric (C L ,A ≈ 0), and the stagnation point is always at θ = 0 • (C P = 1). Moreover, the value of C P behind the cylinder A (downstream of the separation point) is almost constant and by increasing the value of l/d, C P reduces from C P ≈ −0.5 at l/d = 1.5 down to C P ≈ −0.9 at l/d = 4.…”

Section: Resultsmentioning

confidence: 93%

“…4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19, and 20. In the first part, the pressure coefficient distributions on the surface of the cylinders are presented and then variations of lift and drag coefficients are represented by l/d using pressure distribution method.…”

Section: Resultsmentioning

confidence: 99%

“…Dalton and Szabo [6] investigated the 6 effects of spacing, orientation and Reynolds numbers on the drags of three cylinders in an in-line arrangement. Gerhardt and Kramer [10] studied the interference effects for groups of three or four stacks. Moreover, Eastop and Turner [7] studied the effects of spacing on the flow characteristics and the drag of three cylinders in a longitudinal and in a transverse arrangement.…”

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confidence: 99%

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Force coefficients and Strouhal numbers of three circular cylinders subjected to a cross-flow

2011

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In this paper, wind tunnel experiments were conducted to measure the mean force coefficients and Strouhal numbers for three circular cylinders of equal diameters in an equilateral-triangular arrangement when subjected to a cross-flow. These experiments were carried out at five subcritical Reynolds numbers ranging from 1.26 × 10 4 to 6.08 × 10 4 . The pressure distributions on the surface of the cylinders were measured using pressure transducers. Furthermore, the hot-wire anemometer was employed to measure the vortex shedding frequencies behind each cylinder. Six spacing ratios (l/d) varying from 1.5 to 4 were investigated. It is observed that for l/d > 2, the upstream cylinder experiences a lower mean drag coefficient compared with the downstream cylinders. The minimum values of the drag coefficient for the downstream cylinders occur at l/d = 1.5 and l/d = 2, because there is no vortex shedding from the foregoing cylinders. Also, the value of the pressure coefficient behind the upstream cylinder reduces by increasing l/d. Moreover, by decreasing the value of l/d, the Strouhal number for the upstream cylinder increases. It can be concluded that the flow pattern and aerodynamic coefficients are basically dependent on l/d; in other words, decreasing l/d results in an increase in the effects of the flow interference between the cylinders.

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Interference and Proximity Effects

Wardlaw

1994

Wind-Excited Vibrations of Structures

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Interference effects for groups of stacks

Cited by 12 publications

References 1 publication

Effects of interference among three equidistantly arranged cylinders in a uniform flow

Effects of interference among three equidistantly arranged cylinders in a uniform flow

Force coefficients and Strouhal numbers of three circular cylinders subjected to a cross-flow

Interference and Proximity Effects

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