The effect of turbulence intensity and scale on the flow past square prisms

Petty, D. G.

doi:10.1016/0167-6105(79)90005-9

Cited by 28 publications

(4 citation statements)

References 2 publications

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“…x , experiment; 0 , equation 1 others, gave a correction method for bluff bodies by using a simple free-streamline representation of the wake and considering the momentum balance in the external flow. The method was shown to give good results for flat plates normal to the flow up to about 10 yo blockage ratio, but for other rectangular cylinders such as a square one the results were found to be rather unsatisfactory (Petty 1979;Courchesne & Laneville 1979; see also figure 3 of this paper).…”

Section: -Fiqure 3 Blockage Effect For the Base-pressure Coefficientmentioning

confidence: 81%

“…However, it has also been shown that there is very little or no effect of turbulence scale, despite a significant effect of turbulence intensity. This applies to two-dimensional bluff bodies such as rectangular cylinders, including a square (Bearman 1972 ; Laneville, Gartshore & Parkinson 1975;Nakamura & Tomonari 1976;Petty 1979;Laneville & Williams 1979), and also a cube, which is one of the most typical three-dimensional bluff bodies (Roberson et al 1972 ; Bearman 1980). The only exception where there is a significant effect of turbulence scale is for square and circular plates that are placed normal to the flow (Bearman 1971).…”

Section: Introductionmentioning

confidence: 99%

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The effects of turbulence on the mean flow past two-dimensional rectangular cylinders

1984

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There are two main effects of turbulence on the mean flow past rectangular cylinders, just as found earlier for square rods. Small-scale turbulence increases the growth rate of the separated shear layers through increased mixing. Large-scale turbulence weakens regular vortex shedding by reducing spanwise correlation. The consequences of increased mixing and weakened regular vortex shedding depend on the depth-to-height ratio of a rectangular cylinder. In particular, the mean base pressure of a rectangular cylinder can be varied significantly by both the scale and intensity of turbulence.

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Section: -Fiqure 3 Blockage Effect For the Base-pressure Coefficientmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

The effects of turbulence on the mean flow past two-dimensional rectangular cylinders

1984

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“…Ohya significant effect of turbulence intensity. This is true with two-dimensional bluff bodies such as rectangular cylinders (Bearman 1972 ;Laneville, Gartshore & Parkinson 1975;Nakamura & Tomonari 1976;Petty 1979;Laneville & Williams 1979) and also with a cube, one of the most typical three-dimensional bluff bodies (Roberson et al 1972;Bearman 1980). The only exception where there is significant effect of turbulence scale is square and circular plates with their flat face normal to the flow.…”

Section: Introductionmentioning

confidence: 98%

The effects of turbulence on the mean flow past square rods

Nakamura

Ohya

1983

J. Fluid Mech.

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There are two main effects of turbulence on the mean flow past rods of square cross-section aligned with the approaching flow. Small-scale turbulence increases the growth rate of the shear layer, while large-scale turbulence enhances the roll-up of the shear layer. The consequences of these depend on the length of a square rod. The mean base pressure of a square rod varies considerably with turbulence intensity and scale as well as with its length.

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“…Literature also abounds with related studies on square cylinders motivated by the problem of wind-induced loading of buildings (Vickery 1966;Lee 1975;Petty 1979). Being bluff bodies, the flow over such cylinders bears some similarity to the flow over circular cylinders.…”

Section: Introductionmentioning

confidence: 99%

Buffeting forces on rigid circular cylinders in cross flows

Savkar

1981

J. Fluid Mech.

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Experimentally measured steady and unsteady forces induced by a cross flow over a smooth circular cylinder are reported in this paper. The measurements were made in the 0·305 m research water tunnel of the Pennsylvania State University. The parameters examined include the Reynolds number, which was varied over a range of 2 × 104 to 2 × 106, free-stream turbulent intensity, integral length scale-to-diameter ratio and active span-to-diameter ratio; however, this paper includes only some of these results.Among the results reported are the complete mean drag data on all the cylinders tested and some fluctuating force data chosen to illustrate the effects of Reynolds number and active span-to-diameter ratio on the measured forces in uniform and turbulent cross flows. From these results, it can be concluded that the unsteady forces bear a functional relation to Reynolds number in the range tested which is very similar to the well-documented behaviour of the mean drag. Thus the effect of free-stream turbulence on both the steady drag forces and the unsteady forces is to shift the transitional region to a lower Reynolds number. Decreasing the active span-to-diameter ratio increases the buffeting lift coefficient at the same Reynolds number. Finally, it is observed that the Strouhal lift signal at transitional Reynolds numbers is no longer quasi-periodic but rather resembles a narrow-band random signal.

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The effect of turbulence intensity and scale on the flow past square prisms

Cited by 28 publications

References 2 publications

The effects of turbulence on the mean flow past two-dimensional rectangular cylinders

The effects of turbulence on the mean flow past two-dimensional rectangular cylinders

The effects of turbulence on the mean flow past square rods

Buffeting forces on rigid circular cylinders in cross flows

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