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Keywords: model test
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Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-30921-MS
... to significantly overpredict the VIM response when compared to the field measurements. In this paper, an interactive numerical-experimental approach has been developed to more accurately predict the VIM response and avoid the shortcomings of the model tests to bridge the gap between the model test predictions...
Proceedings Papers

Paper presented at the Offshore Technology Conference, August 16–19, 2021
Paper Number: OTC-30959-MS
... frequency dynamic responses of tendons, and the design tensions of the Auger tendons were not calibrated to scaled wave basin model tests like the later TLP projects since the Auger TLP. Based on the accumulated experience from more than two decades’ operation and a number of studies conducted on the Auger...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2020
Paper Number: OTC-30718-MS
... of the RP. This paper presents the Guidance notes from the JIP and forms the first release of Jumper VIV fatigue assessment approach to the Industry. ExxonMobil's model test data, the only known test data available in the industry, was used in the development of unique response model and the new design...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2020
Paper Number: OTC-30690-MS
... of excitation and response. A premise for this is that the measurements be of sufficiently high quality. To test the potential of automatic model tuning an established numerical vessel model is subjected to tuning with high-precision data from a model test with wave disturbance only. This may give information...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29553-MS
... the proprietary model test data and research/ design experience accumulated over the past three decades on the riser-soil interactions with the riser engineering community in order to deepen the understanding of this complex problem and to realize economical SCR designs. The objectives are (i) to present a fully...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2019
Paper Number: OTC-29376-MS
... design life extension. The motivations of the paper are to advance the understanding of the complex mechanism of SCR-soil interactions in a comprehensive yet efficient way, to supplement the extensive model test-based SCR-soil interaction studies in the literature, and to offer a numerical tool...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-29039-MS
... Abstract It is challenging to predict the air gaps of floating offshore structures due to the property of ocean waves and induced motions of the structures. Linear analysis based on potential flow theory is common to be used for air gap evaluations before carrying out air gap model tests...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27595-MS
... Motion (VIM) behavior occurs, and VIM behavior occurs under increased current velocities. However, observed VIM amplitudes are much smaller than what is observed under typical model test conditions and there is a significant variation in oscillation period. Yet and evaluation of oscillation periods...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27623-MS
... pipe and heavy pipe responses derived from model test observations. Light pipes tend to rise to the soil surface, whereas heavy pipes sink deeper and self-bury. Reference is made to empirical methods based on OTC-27623-MS 3 combining friction and passive components of lateral resistance and also...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27774-MS
... ], and suggests a way forward. guideline model test prediction guidance upstream oil & gas probability seastate calculation asymmetry factor airgap integrity annual probability operational safety negative airgap subsea system wave impact load horizontal wave impact load peak pressure...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2017
Paper Number: OTC-27673-MS
... complex model tests was used to guide the design. These initially included forced motion and drop tests to define the hydrodynamic properties of the buoy and the hydrodynamic near-field interaction of the buoy and a fixed FPSO turret. Later tests modeled the full system in waves while disconnecting...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27294-MS
... uncertainty than the conventional ways relying on empirical methods. The recent NWB technology development has focused on the customization of CFD software for offshore design practices and validation of the developed analysis tools/procedures against physical model tests. Development has now extended...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-26962-MS
... Abstract A new method for identification of wave drift coefficients and low-frequency damping from model tests is presented. The method is motivated by the lack of robust numerical methods for the calculation of the viscous contribution to the mean and slowly varying wave drift forces – often...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-26950-MS
.... It is essential that fatigue from VIM is properly accounted for in design and operation of the structure. A CFD study was performed using OpenFOAM™ on a model scale, deep draft, "Paired-Column" semi-submersible to estimate the VIM response. The CFD results are compared to model test data. The study concluded...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27007-MS
... 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...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-26977-MS
... Abstract Available field measurements of semisubmersibles indicate that the Vortex Induced Motion (VIM) response is typically found to be smaller than what is predicted in model tests. Reductions of as much as 50% seem to be occurring in the field compared to the response found in model tests...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27088-MS
..., a series of model tests has been conducted in a wave basin, and the roll characteristics of the LNGC are studied with liquid cargo in spherical tanks. Methods/Procedures Scale model tests were conducted with an LNG carrier-like model under waves in an artificial wave basin, whereby the model...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2016
Paper Number: OTC-27071-MS
..., concept approval by Class, and both open water and ice model testing. upstream oil & gas offshore technology conference winch drillship model test turret thruster upper part subsea system water depth disconnection open water ice model test attachment system ice condition lower...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2015
Paper Number: OTC-25986-MS
... carried out. The authors then look into model test verification and correlation analysis of air gap prediction, especially how to deal with random motion effects on deriving the extreme values of air gap. Furthermore, the authors illustrate how to improve deepwater floating system perfor- mance and cost...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2015
Paper Number: OTC-26060-MS
... 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...

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