Experimental study on vortex-induced motions of a semi-submersible platform with four square columns, Part I: Effects of current incidence angle and hull appendages

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

doi:10.1016/j.oceaneng.2012.06.032

Cited by 72 publications

(20 citation statements)

References 45 publications

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“…Most of the corner shape studies were focused on the 0 degree incidence. However, for square section shaped multi-columns structures, the most severe transverse motion which was induced by vortex shedding occurred at 45 degree incidence which was confirmed in both filed measurements and model tests [6][7][8][9][10][11][12]. Thus, the present numerical investigation about corner shape effects is focused on 45 degree incidence.…”

Section: Introductionmentioning

confidence: 64%

Hydrodynamics Around a Deep-Draft Semi-Submersible With Various Corner Shapes

Liang

Tao

2018

Volume 9: Offshore Geotechnics; Honoring Symposium for Professor Bernard Molin on Marine and Offshore Hydrodynamics

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A numerical study on flow over a stationary deep-draft semi-submersible (DDS) with various corner shapes was carried out to investigate the corner shape effects on the overall hydrodynamics. Three models based on a typical DDS design with different corner shapes were numerically investigated under 45° incidence. The present numerical model has been validated by an experimental test carried out in a circulating water channel. It is demonstrated that, as the corner shape design changed, the hydrodynamic characteristics alter drastically. In addition, the flow patterns were examined to reveal some insights of the fluid physics due to the changing of different corner shape designs. The detailed numerical results from the geometric study will provide a good guidance for future practical designs.

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Section: Introductionmentioning

confidence: 64%

Hydrodynamics Around a Deep-Draft Semi-Submersible With Various Corner Shapes

Liang

Tao

2018

Volume 9: Offshore Geotechnics; Honoring Symposium for Professor Bernard Molin on Marine and Offshore Hydrodynamics

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“…The total hydrodynamic force is the sum of the inertial, dissipative and restoring forces of the system in each given direction. According to Goncalves et al (2012), the structural dissipative force can be disregarded, due to its smaller magnitude than the other forces. Consequently, the total hydrodynamic force is acquired by adding the inertial and restoring forces.…”

Section: Test Program and Data Analysismentioning

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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“…Shan et al (2011) semi-submersible platform, aiming to reveal wave run-up characteristics along square columns and give the relationship between air gap distributions and wave parameters. Gonçalves et al (2012Gonçalves et al ( , 2013 carried out an experimental study on vortex-induced motion of the semi-submersible platform concept with four square columns to check the influence of different headings and hull appendages. Matos et al (2011) discussed the second-order resonant heave, roll and pitch motions of a deep-draft semi-submersible by comparing the theoretical results and experimental results.…”

Section: Introductionmentioning

confidence: 99%

Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

Chen

Huang

et al. 2014

Ships and Offshore Structures

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The wind farm installation vessel is a floating structure with multiple legs. The legs underwater have a prominent effect on the responses of the vessel on waves. The main factor is that the existing of the legs under water leads to the hydrodynamic characteristics different from the normal vessel without legs. To analyse the influence of the legs underwater on the hydrodynamic responses, five cases are classified according to the length of the legs under water. Then, the hydrodynamic responses of the structure in different cases are numerically simulated by applying the three-dimensional potential theory. The hydrodynamic coefficients, wave excitation loads and RAOs of the six degrees of freedom in different wave frequencies are calculated and compared. The results show that the effects of the legs underwater on the hydrodynamic response of a floating structure with multiple legs are visible except for heave motion of the floating body.

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Experimental study on vortex-induced motions of a semi-submersible platform with four square columns, Part I: Effects of current incidence angle and hull appendages

Cited by 72 publications

References 45 publications

Hydrodynamics Around a Deep-Draft Semi-Submersible With Various Corner Shapes

Hydrodynamics Around a Deep-Draft Semi-Submersible With Various Corner Shapes

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

Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

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