Experiments with a steel catenary riser model in a towing tank

Morooka, Celso Kazuyuki; Tsukada, Raphael I.

doi:10.1016/j.apor.2013.10.010

Cited by 46 publications

(7 citation statements)

References 12 publications

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“…In most of the present experiments (as in all of those by Morooka and Tsukada (2013) and Fan et al (2015)) the riser's profile was concave to the current. A convex shape occurred here only in those cases in which the upstream anchorage was at the surface, in the short transition between the lower part of the riser, lying on the floor of the tank under zero tension, and the upper part which hung in a straight line with the normal component of its weight balanced by drag.…”

Section: Introductionsupporting

confidence: 73%

“…In both these experiments, by Morooka and Tsukada (2013) and Fan et al (2015), the lower anchorage was upstream of the upper one, and the shape of the riser could be said to be concave to the oncoming current. An idealised example of this situation, in which the axis of the (stationary) cylinder traces out just one quarter of a circle with one end pointing directly upstream was studied numerically by Miliou et al (2007) at Reynolds numbers of 100 and 500.…”

Section: Introductionmentioning

confidence: 95%

“…Typical radii of curvature were a metre or less. Accounts of previous comparable experiments are provided by Morooka and Tsukada (2013) and Fan et al (2015). In Morooka and Tsukada's case the riser had a diameter of 8mm and a length of 5.2m, and was towed through still water 3.6m deep at speeds of up to 0.07m/s.…”

Section: Introductionmentioning

confidence: 97%

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Laboratory measurements of the vortex-induced vibrations of an untensioned catenary riser with high curvature

Chaplin

King

2018

Journal of Fluids and Structures

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Measurements of the vortex-induced vibrations of an instrumented catenary model riser with high curvature and very low bending stiffness are presented and discussed. The riser had a diameter of 56mm and a length of 5.36m. It was tensioned only by its own weight and by drag and was tested in a recirculating water channel 2m deep at flow speeds up to 1.4m/s in both directions, i.e. with the upstream anchorage on the floor of the tank and the downstream one at the surface (defined as positive current cases), and then vice versa (negative currents). In many cases much of the riser rested on the tank floor with the touchdown point determined by the flow-induced forces on it. Attention is focused mainly on the frequencies of cross-flow vibrations after careful analysis of the effects of gravitational contamination on acceleration measurements. Response spectra were found to have a higher bandwidth than those of tensioned risers perpendicular to the flow and often exhibited more than one distinct peak. Dimensionless peak frequencies (having been normalised with respect to the diameter and a characteristic velocity) were much lower than that associated with a Strouhal number in the region of 0.2. In positive currents (based on the normal incident velocity at the top of the riser, where it was near vertical) it was generally uniform over the length of the riser at about 0.11. In negative currents, away from the tank floor, the riser's profile was a straight line whose inclination was such that the normal incident velocity was independent of the current speed when this exceeded about 0.5m/s. In these conditions the dimensionless peak frequency (based on the uniform normal incident velocity) was about 0.13.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 95%

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Laboratory measurements of the vortex-induced vibrations of an untensioned catenary riser with high curvature

Chaplin

King

2018

Journal of Fluids and Structures

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“…Because the catenary method ignores the effects of pipe bending and torsional stiffness, the catenary algorithm calculation results are very close to the true equilibrium [25]. Because of the characteristics of flexible pipes, the results of the catenary model are more accurate.…”

Section: Pipeline Modelmentioning

confidence: 93%

Dynamic Behavior of the Deepwater Flexible Pipeline during Pipe Laying Process

Wang

Xing

et al. 2020

JMSE

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The dynamic behavior of the flexible pipeline during deepwater Flex-lay directly determines the structures of laying facilities and the actual installation process. A coupled dynamic model considering the effects of different factors was established in this paper. Based on the model, the initial attitude of the flexible pipeline during the laying process was determined by using the natural catenary theory and Morison equation. The hydrodynamic analysis of the HYSY201 pipelaying vessel was carried out by using the finite element software AQWA. Under the specific sea condition, a flexible pipeline with outer-diameter of 352.42 mm being laid onto the 3000 m deep seabed was simulated by using the software OrcaFlex to study the pipeline dynamic behaviors including axial tension, bending moment and stress-strain in the laying process, and the factors affecting the dynamic behavior of the pipeline were analyzed. The results show a significant correlation between the marine loads, vessel motion and the dynamic response of the pipeline. Compared with the static state case, the maximum axial tension, bending moment and stress-strain of the pipeline under the interaction of the marine loads and the vessel motion increased by 42.7%, 220%, 52% and 18.7%, separately. Among the marine loads, the surface wave had the most significant effect on the dynamic performance of the pipeline. When the wave direction acts on the width of the ship, the wave height is greater than 2 m and the spectrum period is eight seconds, the wave has the greatest influence on the dynamic response of the pipeline.

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“…A lot of workers have conducted extensive studies on the SCR including static response, dynamic behavior, pipe-soil interaction and the installation analyses [4][5][6][7][8][9][10][11][12][13]. The installation of the pipeline makes influence of the riser's service life and is an important research direction.…”

Section: Introductionmentioning

confidence: 99%