Hydrodynamic analysis of a hybrid modular floating structure system and its expansibility

2021 ◽  
pp. 1-11
Author(s):  
Yaqiong Liu ◽  
Nianxin Ren ◽  
Jinping Ou
Keyword(s):  
Floating Structure ◽  
Hydrodynamic Analysis ◽  
Structure System

Hydrodynamic analysis of a modular multi-purpose floating structure system with different outermost connector types

2019 ◽  
Vol 176 ◽  
pp. 158-168 ◽  
Author(s):  
Nianxin Ren ◽  
Chi Zhang ◽  
Allan Ross Magee ◽  
Øyvind Hellan ◽  
Jian Dai ◽  
...  
Keyword(s):  
Floating Structure ◽  
Hydrodynamic Analysis ◽  
Structure System

Hydrodynamic Analysis of Multi-Body Floating Piers

2008 ◽  
Author(s):  
Zahra Tajali ◽  
Mehdi Shafieefar ◽  
Mahmood Akhyani
Keyword(s):  
Transfer Functions ◽  
Three Dimensional ◽  
Diffraction Method ◽  
Dynamic Responses ◽  
Floating Structure ◽  
Hydrodynamic Analysis ◽  
Wide Range ◽  
The Individual ◽  
Multi Body ◽  
Wave Induced

Hydrodynamic analysis of a floating multi-body pier interacting with incident waves is carried out in the present research and results of wave-induced motions and structural responses are described. The objective is to develop a procedure which can be used to analyze the motions of such a floating structure consisting of a number of rigid pontoons linked together. Also, optimization of pontoons geometry for a desired length of the pier is examined. In this regard, different alternative arrangements of pontoons with different numbers and dimensions are studied and dynamic responses of these alternatives are investigated. Analysis of the multi-body floating structure is carried out in the frequency domain. The wave-induced forces and the responses are computed by three-dimensional diffraction method. To examine the effect of using different pontoons on pier hydrodynamic response, motion-amplitude transfer functions (RAO) and connector forces for a wide range of wave frequency and heading angle are computed. Results include the absolute and relative responses of the individual pontoons and prediction of pier motions for a wide variety of pontoon geometries in different wave frequencies and heading angles. Also results include effects of pontoons dimension on the response of structure and present heave, roll and pitch motions for floating pier structural system.

Design Issues for Connecting Two Floating Structures

2005 ◽  
Author(s):  
Cedric Morandini ◽  
Jean-Marc Orozco ◽  
Didier L’Hostis
Keyword(s):  
Point Of View ◽  
Design Issues ◽  
Floating Structure ◽  
Hydrodynamic Analysis ◽  
Floating Structures ◽  
Safety Issues ◽  
Potential Contact ◽  
Operational Issues

The proposed paper shall list and present the issues from a mooring and hydrodynamic point of view relative to the design of a floating structure connected to another floating structure in surface and to the seabed with traditional anchoring legs, such as a Flotel with an F(P)SO. The paper will propose tentative ways to properly design the connections between the two floating structures which will limit their relative excursions in order to allow the setting of a gangway between them. In addition, the design should forbid at any time any potential contact between the two structures in intact and damage conditions, and should trigger at any time acceptable tensions in the various anchoring and mooring systems. The paper will address the appropriate mooring and hydrodynamic analysis to be used for such exercise. Safety issues such as quick disconnection in case of fire are investigated. Operational issues are to be discussed as well.

A Coupled Frequency and Time Domain Approach for Hydroelastic Analysis of Very Large Floating Structure

2021 ◽  
Author(s):  
Dengshuo Chen ◽  
Xingya Feng ◽  
Chao Hou ◽  
Jianfei Chen
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Finite Element Model ◽  
Elastic Deformation ◽  
Mode Shape ◽  
Time Domain ◽  
Element Model ◽  
Floating Structure ◽  
Hydrodynamic Analysis ◽  
Hydroelastic Analysis

Abstract This paper develops a practical approach based on Python that couples the hydrodynamic analysis with the structural analysis, in order to solve the hydroelastic problem of Very Large Floating Structure (VLFS). The hydrodynamic analysis is carried out by solving linear 3D diffraction and radiation problems in the frequency domain, while the structural analysis is performed by a time-domain nonlinear finite element model. The coupling is realized by a generalized mode expansion method where the elastic deformation of the VLFS is regarded as extended radiation mode in the water. We consider a pontoon-type floating plate in regular waves. Analytical mode shape functions are used for representing the VLFS elastic deformations. The Mindlin plate theory is used for the finite element model. Convergence study of structure mode shape numbers, hydrodynamic model mesh and finite element model mesh is carefully carried out. Good agreements of the vertical displacement of the floating plate are found compared with experimental data and numerical results in the literature. Our simulation results show that the dynamic response of the VLFS is significantly influenced with consideration of its elastic deformation in the waves, and we see the influence is more pronounced in relatively shorter waves. The proposed approach is shown promising for hydroelastic analysis for more complex VLFS in realistic ocean seastates.

scholarly journals A Parametric Study on Tensile Stress of a Hybrid Floating Structure System

2012 ◽  
Vol 32 (5B) ◽  
pp. 313-320 ◽  
Author(s):  
Goangseup Zi ◽  
Seung-Jung Lee ◽  
Yeon-Min Kwak ◽  
Youn Jeong
Keyword(s):  
Tensile Stress ◽  
Parametric Study ◽  
Floating Structure ◽  
Structure System

Recent Developments in Computational Methods for the Analysis of Ducted Propellers in Open Water

2019 ◽  
Vol 63 (4) ◽  
pp. 219-234
Author(s):  
João Baltazar ◽  
José A. C. Falcão de Campos ◽  
Johan Bosschers ◽  
Douwe Rijpkema
Keyword(s):  
Computational Methods ◽  
Open Water ◽  
Boundary Element Methods ◽  
Navier Stokes ◽  
Hydrodynamic Analysis ◽  
Numerical Predictions ◽  
Ducted Propeller ◽  
Recent Developments ◽  
Propeller Performance ◽  
Ducted Propellers

This article presents an overview of the recent developments at Instituto Superior Técnico and Maritime Research Institute Netherlands in applying computational methods for the hydrodynamic analysis of ducted propellers. The developments focus on the propeller performance prediction in open water conditions using boundary element methods and Reynolds-averaged Navier-Stokes solvers. The article starts with an estimation of the numerical errors involved in both methods. Then, the different viscous mechanisms involved in the ducted propeller flow are discussed and numerical procedures for the potential flow solution proposed. Finally, the numerical predictions are compared with experimental measurements.

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