Experimental study on vortex-induced motions of a semi-submersible platform with four square columns, Part II: Effects of surface waves, external damping and draft condition

Gonçalves, Rodolfo T.; Rosetti, Guilherme F.; Fujarra, André Luís Condino; Oliveira, Allan C. de

doi:10.1016/j.oceaneng.2013.01.019

Cited by 51 publications

(15 citation statements)

References 18 publications

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“…This comprehensive study adds to the growing body of investigations into the effect of additional damping on the VIM of floaters ( [11], [12] and [13]). This comprehensive study adds to the growing body of investigations into the effect of additional damping on the VIM of floaters ( [11], [12] and [13]).…”

Section: Introductionmentioning

confidence: 93%

VIM Model Test of Deep Draft Semisubmersibles Including Effects of Damping

Antony¹,

Vinayan²,

Madhavan³

et al. 2016

Day 4 Thu, May 05, 2016

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Semisubmersible platforms are good candidates for hydrocarbon exploration and production in the Gulf of Mexico (GoM) and elsewhere. These platforms are a preferred choice for deep-water applications involving higher design throughput. A dry tree application of semisubmersible provides the benefit of having improved well control, direct vertical well access, easy access to production equipment, reduced capital expenditures and other dry tree benefits. These are in addition to the benefits that a semisubmersible platform has over spars and tension leg platforms (TLPs). A public-private partnership has sponsored multiple projects since 2009 with the aim of maturing a dry tree semisubmersible design that is cost-effective and safe like spars and TLPs. Due to the deeper draft of the semisubmersibles proposed for the dry tree applications, vortex induced motion (VIM) is an area of concern that needs to be addressed during the design stage. The research work presented here is a part of the ЉVortex Induced Motion Study for Deep Draft Column Stabilized Floaters.Љ The effect of additional damping due to mooring lines and risers on the VIM response of a deep draft semisubmersible is an area of focus of the ongoing project. CFD-based predictions show a significant reduction in the VIM response when additional damping is considered. With the intent of validating the CFD models and to further understand the effect of additional damping on the VIM response, a model test campaign was conducted with different levels of applied additional damping. The paired column semisubmersible and conventional semisubmersible platforms were tested, with and without damping and the results are discussed here. In addition, during model testing, the conventional semisubmersible hull was equipped with a column force measurement system to measure the hydrodynamic forces on the individual columns.The results of the study show that damping plays a significant role in reducing the platform VIM which directly impacts the estimated fatigue damage of mooring lines and risers, and which in turn can reduce the overall cost of the system.

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Section: Introductionmentioning

confidence: 93%

VIM Model Test of Deep Draft Semisubmersibles Including Effects of Damping

Antony¹,

Vinayan²,

Madhavan³

et al. 2016

Day 4 Thu, May 05, 2016

View full text Add to dashboard Cite

show abstract

“…Different researchers have made conscious attempts to investigate the effect of this phenomenon on deepdraft semisubmersibles. Hong et al (2008), Gonçalves et al (2012a), Gonçalves et al (2012b), Gonçalves et al (2012c) and Bai et al (2013) are some of the recoded reports (experimental and numerical methods) on how a deep draft semisubmersible responds to shed vortexes. The extent of this effect was greatly influenced by the inline motions (surge motions) induced by the hydrodynamic wave loadings (Gonçalves et al, 2012b).…”

Section: Sea Surfacementioning

confidence: 99%

A review of floating semisubmersible hull systems: Column stabilized unit

Odijie

Wang

2017

Ocean Engineering

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Column stabilized semisubmersible is one of the most commonly used hull systems for the design and development of drilling and production platforms used for offshore deep water operations. Recent reconfiguration and design alterations have improved its hydrodynamic behaviour in rough weather conditions and, thus, its application and functionality in ocean engineering. Semisubmersible dry-trees applications and large wind turbine foundation systems in ultra-deep waters require high payload integration for reduced motion responses in all degrees of freedom. This paper presents a review of recent industrial and academic contributions to the development of column stabilized semisubmersible hulls used for deep water operations. It also provides an overview of the motion and structural attachments of semisubmersibles. The type and formation of dry-trees semisubmersibles are discussed. The dynamic behaviour and comparative advantages of them are also explained.

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“…The main characteristics of three configurations are exactly the same as the DDS in Table 1. In addition, they have the same mass ratio and draft condition as presented in Table 2, which are relevant for VIM of multi-column platforms (Goncalves et al, 2013 andRijken, 2014).…”

Section: Models Of Three Configurationsmentioning

confidence: 99%

“…Only appurtenances located on the vertical faces of the column and above the pontoon level appears to alter the VIM response. In the same line of research, Goncalves et al (2012Goncalves et al ( , 2013 performed a series of VIM tests on a semi-submersible to verify the influences of relevant factors such as the current incidence angle, hull appendages, draft condition, external damping, and surface waves.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies of the pontoon effect on vortex-induced motions of deep-draft semi-submersibles

Liu

Xiao

Liang

et al. 2017

Journal of Fluids and Structures

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The vortex-induced motion (VIM) is a critical issue in mooring and riser system design for column-type deepwater platforms. As regards to deep-draft semi-submersibles (DDS), even though VIM is mainly excited by vortex shedding around columns, the large-volume pontoons beneath the columns are also responsible for the wake interference, implying a non-negligible influence on VIM behavior. An experimental study and three-dimensional numerical simulations were performed to analyze the pontoon effect on the VIM of two semi-submersibles and a four-column structure without pontoons. The numerical results using Detached Eddy Simulation (DES) are in good agreement with the experimental measurements obtained from the towing model tests. The present investigations indicate that the resonant phenomenon is observed for all configurations. However, the four-column structure without pontoons shows the most significant transverse responses and yaw motions at both 0°- and 45°-incidences owing to the largest fluctuating lift forces induced by the well-established wake. Additionally, the negative values of work done by the pontoons at all reduced velocities confirm their damping effect on the VIM response

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Experimental study on vortex-induced motions of a semi-submersible platform with four square columns, Part II: Effects of surface waves, external damping and draft condition

Cited by 51 publications

References 18 publications

VIM Model Test of Deep Draft Semisubmersibles Including Effects of Damping

VIM Model Test of Deep Draft Semisubmersibles Including Effects of Damping

A review of floating semisubmersible hull systems: Column stabilized unit

Experimental and numerical studies of the pontoon effect on vortex-induced motions of deep-draft semi-submersibles

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