CFD Analysis of Current-Induced Loads on Large Caisson at Supercritical Reynolds Number

Chakrabarti, Subrata; Debus, Kristian; Berkoe, Jonathan; Rosendall, Brigette

doi:10.1115/1.1894409

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…In order to implement more advanced design of risers [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77] in practice, the current development of riser technology is advancing the coupled riser FE/CFD numerical analysis, in parallel with small-scale laboratory, and larger scale or full-scale in-situ testing. In addition, several commercially available large CFD programs are updated to make them more suitable for offshore applications.…”

Section: Dynamics Of Risersmentioning

confidence: 99%

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Challenges for a Total System Analysis on Deepwater Floating Systems

Chakrabarti¹

2008

TOMECHJ

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In the design of floating systems, three major system components need special attention: the floater, the mooring system, and the riser system. This paper will focus on one the most unique areas in the structural design of these components, namely, the fluid-induced effects on floating structure systems and the associated structural response. Due to the rapid growth in the offshore field, particularly in deep waters, this analysis is seeing a phenomenological growth, and considerable research is ongoing in this area, with steady advancement in the design procedure. The state-of-the-art in the treatment of the individual components of the floating structure, namely, the floater, the mooring system, and the riser system will be briefly described. The importance of their interactive coupling effects with fluid is the special subject that will be emphasized. In particular, the 'Total System Analysis' of the floating system consisting of all three of its dynamic components will be laid out. A possible systematic approach for the complete system and various simplifications available for an efficient practical solution will be elaborated. The paper will conclude with a discussion of the present-day deep water design challenges that remain and the research that is needed to meet these challenges.

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Section: Dynamics Of Risersmentioning

confidence: 99%

“…The following transient turbulent incompressible Navier-Stokes equations are considered in a CFD numerical analysis [64]. They describe, respectively, the conservation of mass and momentum in three-dimensions:…”

Section: Mathematical Modelmentioning

confidence: 99%

Challenges for a Total System Analysis on Deepwater Floating Systems

Chakrabarti¹

2008

TOMECHJ

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Model Tests of a Caisson in Wet Towing for Assessing Resistance and Stability in Calm Water and Waves

Park

Seo

Rhee

2018

Journal of Offshore Mechanics and Arctic Engineering

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A series of model tests of a caisson in wet towing were conducted in a towing tank to assess the stability and effective power requirement in calm water and head sea conditions. The scale ratio of the model was 1/30, and the model-length-based Froude number in the tests ranged from 0.061 to 0.122, which is equivalent to 2 and 4 knots in the full scale, respectively. During the towing of the model, tension on the towline and six-degrees-of-freedom (6DOF) motion of the model were measured. Under the calm water condition, the effects of towing speed, draft, and initial trim variation on the towing stability and effective power were investigated. Initial trim improved stability and reduced required towing power. In head seas, effective power and towing stability were changed with the wavelength. It increased as the wavelength became longer, but the added resistance in long waves also stabilized the model with reduced yaw motion.

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Tsunami Bore Impingement onto a Vertical Column

Arnason¹,

Petroff²,

Yeh³

2009

J. Disaster Res.

115

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In a laboratory wave tank, bores were generated by dam-break: by lifting a gate that initially separated quiescent shallow water from a volume of impounded water. The study was motivated by the problem of tsunami-structure interaction and sought to further the understanding of interactions between the bore-like flow of a broken tsunami wave and structures of different cross sections. Experiments were designed to observe the structure’s effect on the bore as well as the bore’s effect on the structure. This comprehensive study used highly repeatable experiments to measure water-surface variations, velocity flow fields, and forces exerted by bores on vertically erected columns. The temporal and spatial variations of the water-surface elevations were quantified with a Laser-Induced Fluorescence (LIF) technique; velocity flow fields were recorded with a combination of Laser Doppler Velocimeter (LDV) and Digital Particle Image Velocimetry (DPIV); forces on the columns were measured with a miniature load-cell transducer. The laboratory data obtained in the study are available for validating numerical models that predict forces on structures in unsteady flows.

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CFD Analysis of Current-Induced Loads on Large Caisson at Supercritical Reynolds Number

Cited by 3 publications

References 6 publications

Challenges for a Total System Analysis on Deepwater Floating Systems

Challenges for a Total System Analysis on Deepwater Floating Systems

Model Tests of a Caisson in Wet Towing for Assessing Resistance and Stability in Calm Water and Waves

Tsunami Bore Impingement onto a Vertical Column

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