Results 131 to 140 of about 276 (161)
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Effect of Bilge Radius and Bilge Keel Height on Roll Damping Performance of Floating Structures
Volume 8: CFD and FSI, 2021Abstract A round bilge with a bilge keel structure is a key element which can alleviate roll motions of ships and floating structures by transferring the roll momentum of a floating body into the kinetic energy of water. This study presents a practical guide to properly designing a bilge radius and bilge keel height of a barge-shaped and
Chang Seop Kwon +2 more
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Influence of bilge-keel configuration on ship roll damping and roll response in waves
Ocean Engineering, 2020 The bilge keel, which is a widely used tool for passively reducing the roll motion of ships, generates and releases vortices periodically when the ship rolls, leading to dissipation of the roll kinetic energy and rise in the roll damping of the ship. The
Yichen Jiang, Yunfeng Ding, Yuan Sun
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Effects of the asymmetric riser and bilge keel arrangements on FPSO green water assessment [PDF]
Applied Ocean Research, 2019 This article aims to report important findings on how the asymmetric riser and bilge keel arrangements affect the motion response and green water assessment by using a real FPSO conversion project. Recently, the authors have proposed a practical approach
Xin Wang, Wai Lok Woo
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Damping effect of bilge keels with different aspect ratios
Maritime Research news, 2006 The main goal of this research project was to improve the accuracy of numerical seakeeping analysis. Better estimation methods make the evaluation procedures for new vessels more useful. All ship responses are non-linear to some extent, but in many cases when non linearities are small a linear theory yields good predictions.
Pajala, Jukka
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Vortex Shedding From a Bilge Keel in a Transient Turbulent Flow
Volume 5: Ocean Engineering; CFD and VIV, 2012The hydrodynamic damping of a bilge keel during the roll motion of a ship is fairly well understood and its basic principle can be summarized as follows: The larger the bilge keel attached to the hull, the stronger is its roll damping effect. The geometric limitations regarding the size of the bilge keel are set by class regulations ...
Piehl, Henry, el Moctar, Bettar Ould
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Bilge Keel Forces and Vortex Shedding: A Numerical Analysis With OpenFOAM
Volume 2: CFD and VIV, 2014The damping effectiveness of a bilge keel depends on the velocity of the flow and the roll period of the ship. The Morison equation defines the relation between these motion parameter and the forces acting on the bilge keel. Sarpkaya and O’Keefe published in 1996 an article with their results of several flow experiments conducted over a wide range of ...
Piehl, Henry, el Moctar, Bettar Ould
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Analysis of Roll Motion due to Asymmetric Bilge Keels
Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics, 2012Traditional frequency domain based vessel motion analyses operate under the assumption that the roll damping contribution from the port and starboard bilge keels are equivalent. In this work, we examine the roll motion of a vessel with bilge keels of unequal length using a novel methodology.
Nathan Tom +2 more
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Influence of Bilge Keel Width on the Roll Damping of FPSO
Journal of Offshore Mechanics and Arctic Engineering, 2009Current industry practice to control roll motions in floating production storage and offloading (FPSO) vessels is based on using large-width bilge keels. This paper details an experimental study involving a range of bilge keel widths from 0% to 20% of half beam of a FPSO with rectangular geometry.
Krish P. Thiagarajan, Ellen C. Braddock
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Failure analysis of bilge keels and its design improvement
Engineering Failure Analysis, 2013Abstract Several cracks were detected in the internal structure of the bilge keels used to enhance the transverse stability of ships, as well as on the connection of these to the hull and in some regions of the plating edges of the bilge keels. These cracks compromised the watertight integrity of the bilge keels and, in the long run, could also ...
Rui F. Martins +3 more
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Time Varying Forces on FPSO Bilge Keels
Volume 5: Ocean Engineering, 2013One of the more challenging topics in offshore hydrodynamics remains the a-priori prediction of the roll response in irregular waves of a ship-shaped floating unit. It requires insight in how roll damping is generated by the bilge keels in particular.
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