Features of Offshore Structures

Clauss, Günther F.; Lehmann, Eike; Östergaard, Carsten

doi:10.1007/978-1-4471-3193-9_2

Cited by 7 publications

(5 citation statements)

References 4 publications

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Section: Numerical Simulation and Experimental Validationmentioning

confidence: 99%

“…Following Clauss et al (1992), the fluid–structure interaction problem with rigid bodies can be solved by assuming that the velocity gradients induced by the body in the surrounding fluid are negligible. Clauss et al (1992) determined that this condition arises when 2 R / λ < 0.2, as in this case. Therefore, we present the potential model results computed using the numerical package PETSc-FEM (Sonzogni et al , 2002; Storti et al , 2000; D’Elía et al , 2002) to add information for comparison.…”

Section: Numerical Simulation and Experimental Validationmentioning

confidence: 99%

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A numerical and experimental study of a buoy interacting with waves

Núñez Aedo,

Cruchaga,

Storti

2023

HFF

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Purpose This paper aims to report the study of a fluid buoy system that includes wave effects, with particular emphasis on validating the numerical results with experimental data. Design/methodology/approach A fluid–solid coupled algorithm is proposed to describe the motion of a rigid buoy under the effects of waves. The Navier–Stokes equations are solved with the open-source finite volume package Code Saturne, in which a free-surface capture technique and equations of motion for the solid are implemented. An ad hoc experiment on a laboratory scale is built. A buoy is placed into a tank partially filled with water; the tank is mounted into a shake table and subjected to controlled motion that promotes waves. The experiment allows for recording the evolution of the free surface at the control points using the ultrasonic sensors and the movement of the buoy by tracking the markers by postprocessing the recorded videos. The numerical results are validated by comparison with the experimental data. Findings The implemented free-surface technique, developed within the framework of the finite-volume method, is validated. The best-obtained agreement is for small amplitudes compatible with the waves evolving under deep-water conditions. Second, the algorithm proposed to describe rigid-body motion, including wave analysis, is validated. The numerical body motion and wave pattern satisfactorily matched the experimental data. The complete 3D proposed model can realistically describe buoy motions under the effects of stationary waves. Originality/value The novel aspects of this study encompass the implementation of a fluid–structure interaction strategy to describe rigid-body motion, including wave effects in a finite-volume context, and the reported free-surface and buoy position measurements from experiments. To the best of the authors’ knowledge, the numerical strategy, the validation of the computed results and the experimental data are all original contributions of this work.

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Section: Numerical Simulation and Experimental Validationmentioning

confidence: 99%

Section: Numerical Simulation and Experimental Validationmentioning

confidence: 99%

A numerical and experimental study of a buoy interacting with waves

Núñez Aedo,

Cruchaga,

Storti

2023

HFF

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Section: Outline Of Design and Analysismentioning

confidence: 99%

“…Water is assumed to be incompressible, nonviscous and irrotational. A velocity potential Φ=Φ(x,y,z,t) can be used to describe the fluid velocity vector V (x,y,z,t)=(u,v,w) at time t at the point x = ( x, y, z ) in a Cartesian coordinate system48–69. The velocity vector V (x, y, z, t)=(u, v, w) can be expressed by the following equation under the assumption of linear wave theory of small amplitude where i , j , k are unit vectors along the x ‐, y ‐ and z ‐axes, respectively.…”

Section: Appendix: Amentioning

confidence: 99%

Analysis and design of floating bridges

Watanabe

Utsunomiya

2003

Progress Structural Eng Maths

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The history of floating bridges can be dated back to 2000 BC. There are many types of floating bridges, depending on the conditions of the land and the types of barriers to cross. As compared with land‐based bridges, only limited information is available for floating bridges in many respects, such as past construction records, meteorological and durability conditions. In recent years it has been possible to design floating bridges more scientifically because of theoretical developments in the hydrodynamic interactions between fluid and floating bodies. This paper aims to overview the design and analysis of floating bridges following a recently published design manual by JSCE, and describes the recent development of their design with special emphasis on the use of steel.

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“…Most of the literature acknowledges that the wave spectrum of marine states has a period range from 3 s to 20 s (frequency from 0.33 Hz to 0.05 Hz) [1][2][3]. Wave loads are dynamic loads by nature, which are roughly described by wave theories or described by the wave spectrum (random waves).…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis of Fixed Steel Jacket Structure Under Dynamic Effects of Wave Loads in Vietnam Sea Conditions

Bui¹

2023

GEOMATE

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This paper presents an algorithm to evaluate the dynamic effects of wave loads on fixed steel Jacket structures (Jacket structures) through the ratio between the dynamic response and the static response of the structure under the action of sea waves. The algorithm proposed in this paper can be applied to evaluate the dynamic effects of wave loads in the strength analysis for Jacket structures, to provide a limit to the selection of a method for analyzing the structure, and the structure period. The research to find out the limit on the distance between the wave period and the natural period of the structure to choose the appropriate structural analysis method for each sea area is necessary. Because the current Design standards give the "3.0 s or 2.5 s rule", (use the quasi-static method when Tmax ≤ 3.0 s or T max ≤ 2.5 s) and also only it is clear that the scope of this rule is for the North Sea and the Gulf of Mexico. The research results of this paper will answer the question: Is the use of standards for the North Sea and Gulf of Mexico to analyze Jacket structures in marine conditions outside the study area of the standards suitable? Hoped that this paper will be a reference for engineers when choosing a method of strength analysis of Jacket structures in specific marine conditions at the construction site.

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Features of Offshore Structures

Cited by 7 publications

References 4 publications

A numerical and experimental study of a buoy interacting with waves

A numerical and experimental study of a buoy interacting with waves

Analysis and design of floating bridges

Strength Analysis of Fixed Steel Jacket Structure Under Dynamic Effects of Wave Loads in Vietnam Sea Conditions

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