Analysis and experimental evaluation of single point moored buoy systems

Berteaux, Henri O.; Walden, Robert G.

doi:10.1575/1912/5371

Cited by 14 publications

(16 citation statements)

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“…3), there is a considerable wake aft of the sphere at a Reynolds number of about 10 6 , which produces fairly large drag forces. Indeed, Fluent reports a drag coefficient of 0.55 based on a maximum frontal area, a value that is in good agreement with conventional experimental results (Berteaux 1991).…”

Section: ) Spherical Buoysupporting

confidence: 83%

“…The relative importance of drag from different mooring components depends upon the specific characteristics of each mooring (Berteaux 1991). Drag causes two primary problems-the instruments move deeper than deployed and change their position as the water velocity changes.…”

Section: A Problemmentioning

confidence: 99%

“…Rather, bluff objects experience separated flow over a large proportion of the body surface and, depending on the velocity of the impingent current, the wake varies in width and vortex structure (Berteaux 1991).…”

Section: B Backgroundmentioning

confidence: 99%

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Reducing Drag and Oscillation of Spheres Used for Buoyancy in Oceanographic Moorings

Hurley

Young

Williams

2008

Journal of Atmospheric and Oceanic Technology

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Numerical and laboratory results of the drag characteristics are presented for different configurations of an underwater buoyancy package. It is shown that the drag and oscillation of an underwater sphere can be reduced substantially with the addition of a shaped cowling. The influence of several different cowling shapes on the drag and lift are determined. The results from a numerical fluid dynamical calculation are compared and laboratory measurements are scaled. Both the dynamic and static components of drag and lift are presented. The drag force for an underwater sphere can be reduced by more than 80% for a full teardrop-shaped cowling. A truncated teardrop, more practical for real applications, will still reduce the drag by 60%-70%. In addition to the drag, the amplitude of oscillations driven by eddy shedding is similarly reduced.

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Section: ) Spherical Buoysupporting

confidence: 83%

Section: A Problemmentioning

confidence: 99%

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Reducing Drag and Oscillation of Spheres Used for Buoyancy in Oceanographic Moorings

Hurley

Young

Williams

2008

Journal of Atmospheric and Oceanic Technology

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“…Jacketed specimen with simulated fishbite damage in the jacket would last only half as much as the undamaged specimen (Berteaux, 1969). Early experience with synthetic fiber mooring lines of large diameters (one inch or more) seemed to indicate that these larger ropes were less susceptible to failure from fishbites than the smaller ones.…”

Section: Curative Methodsmentioning

confidence: 99%

Deep sea moorings fishbite handbook

Berteaux¹,

Prindle²

1987

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The purpose of this handbook is to bring awareness and a degree of expertise to the very real problem of fish attacks on mooring lines and cables deployed in the open seas.Over the years the authors have carefully examined a large sample of damaged, sometimes entirely severed ropes retrieved from the sea.Often direct evidence and / or biological observations showed that the ropes were the victims of fish attacks. In many cases however the cause of rope failure remained difficult to ascertain. Techniques and rationales therefore had to be devised to elucidate the more thorny cases.Understanding a problem, the saying goes, is half of the solution. The other half, as far as this handbook is concerned, is of course to make known the ways which, at the moment, could help prevent fishbite attacks or at least abate its effects.Thus the handbook will follow a natural progression.

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“…Figure la -This system has been used with success by Woods Hole Oceanographic Institution [Berteaux and Walden, 1969] and by Scripps Institution of Oceanography [Isaacs, et al, 1965; Sessions and Brown, 1971].…”

Section: Design Requirementsmentioning

confidence: 99%