Validation of HVS Semisubmersible VIM Performance by Model Test and CFD

Xu, Qi; Kim, Jang; Bhaumik, Tirtharaj; O’Sullivan, Jim; Ermon, James

doi:10.1115/omae2012-83207

Cited by 14 publications

(7 citation statements)

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“…Technip semisubmersible has been developed based on HVS (Heave and VIM suppressed) Technology (Xu, 2011;Xu et al, 2012). Technip has been developing new semisubmersible hull form that suit industry demands in worldwide design environments.…”

Section: Application To New Semisubmersible Hull Design and Performanmentioning

confidence: 99%

“…A set of parametric model tests has provided the validation of the VIM response of HVS semisubmersible for different column step height and width (Xu et al, 2012). The VIM model tests showed significantly improved VIM performance for the HVS as compared to the conventional semisubmersible of the same draft.…”

Section: Figure 14 -Heave Rao Comparisons For Semi-submersiblesmentioning

confidence: 99%

“…CFD simulation and the semi-empirical global performance tools have been used to find out optimal shape and size of the stepped column for minimum impact on riser fatigue and strength due to VIM and heave motions, respectively (Xu et al, 2012). A typical design spiral of an offshore floater starts with hull sizing to minimize weight and cost under the design constraints dictated by fabrication, transportation, installation and operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Design optimization of the dry-tree semisubmersible was focused on heave motion performance since the earlier parametric study of the HVS hull (Xu et al, 2012) provided good design guidence on VIM performance. The key design aspect of a dry-tree Semi is to minimize heave motion to accommodate design limits of riser tensioner stroke range while maintaining low vortex induced motion to prevent excessive fatigue loading on export risers and mooring system.…”

Section: Introductionmentioning

confidence: 99%

“…The validated numerical wave basin has been applied to develop a new semi-submersible hull design for a given design environment, partially replacing the role of the physical model test in the traditional design spiral. Recent efforts focused on the development of the HVS Semi-submersible for wet-tree application (Xu et al, 2012) and the extension of the HVS hull to dry-tree applications (Kyoung et al, 2013). Review of the development, current status and future prospects of numerical wave basin for offshore platform design is presented in this paper.…”

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confidence: 99%

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CFD-Based Numerical Wave Basin for Offshore Floater Design

Kim¹,

Jang²,

Kyoung³

et al. 2015

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Technip recently has developed new cost-effective and riser-friendly Semi-submersible hull forms adapted to various operation sites, with considerable saves in design cost and time. This achievement is greatly in debt to Technip's numerical wave basin, which has been developed and validated through previous projects and collaborative R&D efforts with clients. Validation of the numerical wave basin against the model test and full-scale measurement data has proven that the numerical wave basin can provide more realistic and reliable prediction of the wave-and vortex-induced motion than the physical model test. The validated numerical wave basin has been applied to develop a new semi-submersible hull design for a given design environment, partially replacing the role of the physical model test in the traditional design spiral. The new design spiral based on numerical wave basin provides optimized hull design more expeditiously and efficiently than the traditional design spiral based on physical model test. Review of the development, current status and future prospects of numerical wave basin for offshore platform design is presented in this paper.re-calibrated to provide more accurate design parameter for the next phase of the project, which is the typical case for the design of conventional hull forms. There have been a few occasions, however, the discrepancy between prediction and model test results being beyond the adjustment of empirical formula and result into major modification of the hull design, and some cases even change of the design concepts, which lead to considerable delay and increase of project schedule and cost. This worst scenario occurs when unexpected physical phenomena that could not be modeled by the analytic model are observed in the model test. These unexpected physical phenomena are mostly related to nonlinear fluid force and viscous effects.Along with the efforts to improve conventional global performance tools, Technip has been investing in CFD capability for the analysis of viscous dominant problems such as drag coefficients of hull parts and vortex induced motion of Spars (Halkyard et al., 2006, Atluri et al, 2009, Lefevre et al., 2013. Recently, the utilization of CFD for offshore floater design extends to free-surface flow problems for Spars and multi-column floaters with the aides of the advances of CFD codes in free-surface capturing and moving mesh techniques, together with the computing power of modern high-performance parallel computers that has been growing exponentially year by year. Technip is developing numerical wave basin to provide design parameters of run up, air gap, green water and nonlinear wave load on the hull at the early stage of floater design. The numerical wave basin provides wave-induced loads and motion on fixed and floating structures correlating with the model test measurements within engineering tolerance for the design purpose , Wu et al., 2014. Numerical wave basin will gradually substitute the role of scaled model test in the design spiral, as depicted in ...

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Section: Application To New Semisubmersible Hull Design and Performanmentioning

confidence: 99%

Section: Figure 14 -Heave Rao Comparisons For Semi-submersiblesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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