Spanwise structure of wall pressure on a cylinder in axial flow

Bokde, Arun L.W.; Lueptow, Richard M.; Abraham, Bruce M.

doi:10.1063/1.869909

Cited by 14 publications

(12 citation statements)

References 32 publications

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“…point wall pressure (table 5) closely match those of . Snarski & Lueptow (1995) and Bokde et al (1999) performed experiments at similar Reynolds numbers to those considered here. Snarski & Lueptow (1995) give a point r.m.s.…”

Section: 3mentioning

confidence: 99%

“…Snarski & Lueptow (1995) give a point r.m.s. wall pressure measurement (scaled on ρU 2 0 ) of 4.32 × 10 −3 for Re = 3644 for δ = 5, and Bokde et al (1999), 4.63 × 10 −3 for Re = 3300 for δ = 4.81. These are consistent with the values obtained here (table 5).…”

Section: 3mentioning

confidence: 99%

“…A substantial body of work comes from Lueptow and his colleagues (Lueptow, Leehey & Stellinger 1985;Lueptow & Haritonidis 1987;Lueptow 1988Lueptow , 1990Lueptow & Jackson 1991;Wietrzak & Lueptow 1994;Snarski & Lueptow 1995;Nepomuceno & Lueptow 1997;Bokde, Lueptow & Abraham 1999). These are experimental studies of flow with a Reynolds number of 3 × 10 3 − 5 × 10 3 with the boundary-layer thickness 5-8 times the cylinder radius.…”

Section: Introductionmentioning

confidence: 99%

“…Willmarth & Yang (1970) give experimental spectra for a cylinder with Re = 115 000 and a boundary-layer thickness (δ) of approximately 2a, and Willmarth et al (1976) a cylinder with Re = 36 800 and δ ≈ 4a. Bokde et al (1999) give measurements for a cylinder with Re = 3300 and δ = 4.81a and Snarski & Lueptow (1995) measurements for a cylinder with Re = 3644 andδ = 5a. Statistics on the pressure fluctuations from the numerical study by are presented in .…”

Section: Introductionmentioning

confidence: 99%

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Flow along a long thin cylinder

Tutty

2008

J. Fluid Mech.

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Two different approaches have been used to calculate turbulent flow along a long thin cylinder where the flow is aligned with the cylinder. A boundary-layer code is used to predict the mean flow for very long cylinders (length to radius ratio of up to O(10 6 )), with the effects of the turbulence estimated through a turbulence model. Detailed comparison with experimental results shows that the mean properties of the flow are predicted within experimental accuracy. The boundary-layer model predicts that, sufficiently far downstream, the surface shear stress will be (almost) constant. This is consistent with experimental results from long cylinders in the form of sonar arrays. A periodic Navier-Stokes problem is formulated, and solutions generated for Reynolds number from 300 to 5 × 10 4 . The results are in agreement with those from the boundary-layer model and experiments. Strongly turbulent flow occurs only near the surface of the cylinder, with relatively weak turbulence over most of the boundary layer. For a thick boundary layer with the boundary-layer thickness much larger than the cylinder radius, the mean flow is effectively constant near the surface, in both temporal and spatial frameworks, while the outer flow continues to develop in time or space. Calculations of the circumferentially averaged surface pressure spectrum show that, in physical terms, as the radius of the cylinder decreases, the surface noise from the turbulence increases, with the maximum noise at a Reynolds number of O(10 3 ). An increase in noise with a decrease in radius (Reynolds number) is consistent with experimental results.

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Section: 3mentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow along a long thin cylinder

Tutty

2008

J. Fluid Mech.

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“…According to Bokde et al (1999), the turbulent boundary layer on a cylinder in axial flow is not significantly different from that on a flat plate when the boundary layer thickness is of the same order or smaller than the radius of the cylinder. For a cylindrical geometry the turbulent structures are not bounded in the span-wise direction, and are free to move around the streamer.…”

Section: The Acoustic Source Termmentioning

confidence: 99%

Flow and swell noise in marine seismic data

2009

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Various weather-related mechanisms for noise generation during marine seismic acquisition were addressed from a fluid-dynamic perspective. This was done by analyzing a number of seismic lines recorded on modern streamers during nonoptimal weather conditions. In addition, we examined some of the complex fluid-mechanics processes associated with flow that surrounds seismic streamers. The main findings were that noise in the [Formula: see text] range is mostly the result of direct hydrostatic-pressure fluctuations on the streamer caused by wave motion. For normal swell noise above [Formula: see text] and for crossflow noise, a significant portion of the observed noise probably comes from dynamic fluctuations caused by the interaction between the streamer and fluid structures in its turbulent boundary layer. This explanation differs from most previous work, which has focused on streamer oscillations, bulge waves inside old fluid-filled seismic streamers, or strumming/tugging as the main source of weather-related noise. Although modern streamers are less sensitive to such sources of noise, their ability to tackle the influence on turbulent flow noise has not improved. This implies that noise induced by turbulent flow has increased its relative impact on modern equipment. To improve the signal-to-noise ratio on seismic data, design issues related to flow noise must be addressed.

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Turbulent boundary layers on axially inclined cylinders. Part 1. Surface-pressure/velocity correlations

Heenan

Morrison

2002

Experiments in Fluids

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Spanwise structure of wall pressure on a cylinder in axial flow

Cited by 14 publications

References 32 publications

Flow along a long thin cylinder

Flow along a long thin cylinder

Flow and swell noise in marine seismic data

Turbulent boundary layers on axially inclined cylinders. Part 1. Surface-pressure/velocity correlations

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