Simulation of vortex-induced motions of a deep draft semi-submersible in current.
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| Title: | Simulation of vortex-induced motions of a deep draft semi-submersible in current. |
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| Authors: | Chen, Chia-Rong1, Chen, Hamn-Ching2 |
| Source: | Ocean Engineering. May2016, Vol. 118, p107-116. 10p. |
| Subjects: | Semi-submersible offshore structures, Vortex motion, Vortex shedding, Navier-Stokes equations, Large eddy simulation models, Computational fluid dynamics |
| Abstract: | The vortex-induced motion (VIM) of semi-submersible platforms becomes an important issue with the recent development of deep draft semi-submersible platforms. As a result of the increased draft, the semi-submersibles are susceptible to coherent vortex shedding, and the VIM increases significantly. The VIM of semi-submersibles is more complex than those of spars and mono-column hulls, due to the wake interaction of vortices shed from multiple columns. In the present study, numerical simulations are performed for a semi-submersible with four square columns subject to a current at a 45° incidence angle and allowed surge (in-line), sway (transverse), and yaw motions. Calculations were performed using the Finite-Analytic Navier–Stokes (FANS) code in conjunction with a moving overset grid approach. Computations are conducted over a wide range of reduced velocities, from pre-lock-in to post-lock-in conditions. Both the full scale and the 1:70 model platforms are studied and detailed results compared to check the scale effect. In addition, three corner geometries are simulated, and the semi VIM is found to be sensitive to the corner rounding. Comparisons are made with experimental data to demonstrate the capability of the present CFD approach. [ABSTRACT FROM AUTHOR] |
| Copyright of Ocean Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 115217828 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Simulation of vortex-induced motions of a deep draft semi-submersible in current. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Chen%2C+Chia-Rong%22">Chen, Chia-Rong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Hamn-Ching%22">Chen, Hamn-Ching</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ocean+Engineering%22">Ocean Engineering</searchLink>. May2016, Vol. 118, p107-116. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Semi-submersible+offshore+structures%22">Semi-submersible offshore structures</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+motion%22">Vortex motion</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+shedding%22">Vortex shedding</searchLink><br /><searchLink fieldCode="DE" term="%22Navier-Stokes+equations%22">Navier-Stokes equations</searchLink><br /><searchLink fieldCode="DE" term="%22Large+eddy+simulation+models%22">Large eddy simulation models</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The vortex-induced motion (VIM) of semi-submersible platforms becomes an important issue with the recent development of deep draft semi-submersible platforms. As a result of the increased draft, the semi-submersibles are susceptible to coherent vortex shedding, and the VIM increases significantly. The VIM of semi-submersibles is more complex than those of spars and mono-column hulls, due to the wake interaction of vortices shed from multiple columns. In the present study, numerical simulations are performed for a semi-submersible with four square columns subject to a current at a 45° incidence angle and allowed surge (in-line), sway (transverse), and yaw motions. Calculations were performed using the Finite-Analytic Navier–Stokes (FANS) code in conjunction with a moving overset grid approach. Computations are conducted over a wide range of reduced velocities, from pre-lock-in to post-lock-in conditions. Both the full scale and the 1:70 model platforms are studied and detailed results compared to check the scale effect. In addition, three corner geometries are simulated, and the semi VIM is found to be sensitive to the corner rounding. Comparisons are made with experimental data to demonstrate the capability of the present CFD approach. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ocean Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.oceaneng.2016.04.005 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 107 Subjects: – SubjectFull: Semi-submersible offshore structures Type: general – SubjectFull: Vortex motion Type: general – SubjectFull: Vortex shedding Type: general – SubjectFull: Navier-Stokes equations Type: general – SubjectFull: Large eddy simulation models Type: general – SubjectFull: Computational fluid dynamics Type: general Titles: – TitleFull: Simulation of vortex-induced motions of a deep draft semi-submersible in current. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Chen, Chia-Rong – PersonEntity: Name: NameFull: Chen, Hamn-Ching IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 05 Text: May2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 00298018 Numbering: – Type: volume Value: 118 Titles: – TitleFull: Ocean Engineering Type: main |
| ResultId | 1 |
