scholarly journals SIMULATION OF TIDAL CURRENTS AND DIFFUSION TAKING INTO DENSITY STRATIFICATION AROUND VERY LARGE FLOATING STRUCTURES

2000 ◽  
Vol 65 (528) ◽  
pp. 189-195
Author(s):  
Kyoichi OKAMOTO ◽  
Takeshi ONO ◽  
Osamu SAIJO
Keyword(s):  
Tidal Currents ◽  
Density Stratification ◽  
Floating Structures ◽  
And Diffusion ◽  
Very Large Floating Structures

Theoretical Study on Hydroelastic Responses of Very Large Floating Structures Near Islands and Reefs

2014 ◽  
Author(s):  
Chao Tian ◽  
Xinyun Ni ◽  
Jun Ding ◽  
Peng Yang ◽  
Yousheng Wu
Keyword(s):  
Large Scale ◽  
Oil And Gas ◽  
Linear Equations ◽  
Dynamic Responses ◽  
Wave Loads ◽  
Structural Dynamic ◽  
Floating Structures ◽  
Geological Conditions ◽  
Incident Waves ◽  
Very Large Floating Structures

In order to explore the fishery, oil and gas, and tourism resources in the ocean, Very Large Floating Structures (VLFS) can be deployed near islands and reefs as a logistic base with various functions such as a floating harbor, accommodation, fishery processing, oil and gas exploration, environment surveillance, airplane landing and taking off, etc. However, in addition to the complicated hydroelastic coupling effects between the hydrodynamic loads and structural dynamic responses, when tackling the hydroelastic problems of floating structures deployed near islands and reefs, several other environmental effects and numerical techniques should be taken into account: 1) The influences of the non-uniform incident waves (multi-directions, different wave frequencies); 2) Complex seabed profile and its impact on the incident waves; 3) Nonlinear second order wave exciting forces in the complex mooring system, shallow water and coral reef geological conditions; 4) Parallel computing technology and fast solving methods for the large scale linear equations, accounting for the influence of dramatic increase of number of meshes to the computation efforts and efficiency. In the present paper the theoretical investigation on the hydroelastic responses of VLFS deployed near islands and reefs has been presented. In addition, based on the pulsating source Green function, the high performance parallel fast computing techniques and other numerical methods, in solving large scale linear equations, have been introduced in the three-dimensional hydroelastic analysis package THAFTS. The motions, wave loads, distortions and stresses can be calculated using the present theoretical model and the results can be used in the design and safety assessment of VLFS.

Concept Design of Very Large Floating Structures and Laboratory-Scale Physical Modelling

2019 ◽  
Author(s):  
Lorenzo Cappietti ◽  
Irene Simonetti ◽  
Ilaria Crema
Keyword(s):  
Numerical Models ◽  
Physical Modelling ◽  
Building Blocks ◽  
Small Scale ◽  
World Population ◽  
Concept Design ◽  
Wave Loads ◽  
Experimental Database ◽  
Floating Structures ◽  
Very Large Floating Structures

Abstract The use of Very Large Floating Structures, VLFS, may represent a strategic approach in order to cope with some of the future societal challenges arising from the impressive growth of the world population. In this article, the motivations of this perspective are briefly discussed, the main issues for the development of VLFS are summarized and a concept structural design based on building-blocks technology is proposed. A small-scale physical model was manufactured and tested in the wave-current flume of the Laboratory of Maritime Engineering, LABIMA, of the Florence University, Italy. The aim of this study is the assessment of the structural feasibility and the effectiveness of the proposed VLFS concept, in terms of resistance to wave loads and control of floating behavior. The experimental measurements provide a first contribution to the necessary knowledge, about load magnitudes and floating behavior, for sizing some of the key structural components. The results appear to support the feasibility of the system in terms of usage of structural materials, technical components and building technologies, available at present, that can withstand the measured loads. Moreover, the acquired experimental database is fundamental in order to validate numerical models, in the perspective of using also such tools as complementary methodology for further improvement of the knowledge of design issues.

scholarly journals Building Cities on the Sea

2020 ◽  
Vol 142 (04) ◽  
pp. 42-47
Author(s):  
Michael Abrams
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Floating Structures ◽  
Very Large Floating Structures

Abstract As sea level rise threatens cities across the globe, engineers are looking at relocating giant pieces of infrastructure to buoyant buildings, or very large floating structures. What had once seemed like an exercise in extreme engineering now has taken on an edge of desperate necessity. Can the challenges be overcome in time?

scholarly journals Estimation method of slowly varying wave drift force acting on very large floating structures

2000 ◽  
Vol 2000 (188) ◽  
pp. 287-293
Author(s):  
Yasuhiro Namba ◽  
Shunji Kato ◽  
Hiroshi Sato ◽  
Tomoki Ikoma ◽  
Katsuya Maeda
Keyword(s):  
Estimation Method ◽  
Floating Structures ◽  
Wave Drift ◽  
Drift Force ◽  
Very Large Floating Structures
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