The hydrodynamic behaviour of long floating structures in directional seas

1995 ◽  
Vol 17 (4) ◽  
pp. 233-243 ◽  
Author(s):  
S.A. Sannasiraj ◽  
V. Sundar ◽  
R. Sundaravadivelu
Keyword(s):  
Floating Structures ◽  
Hydrodynamic Behaviour

Resonant Motion of Liquid Confined between Floating Structures

2014 ◽  
Vol 567 ◽  
pp. 289-294
Author(s):  
N.V. Nasma Noor ◽  
A.P. Shashikala
Keyword(s):  
Resonant Frequency ◽  
Frequency Domain Method ◽  
Diffraction Radiation ◽  
Floating Bodies ◽  
Floating Structures ◽  
Hydrodynamic Behaviour ◽  
Wave Elevation ◽  
Close Proximity ◽  
Multiple Floating Bodies ◽  
Two Bodies

Many applications occur in the field of marine hydrodynamics where two or more vessels are in sufficiently close proximity to experience significant wave action. The motion of such floating bodies in waves is frequency dependent. In the case of multiple floating bodies, when resonance occurs, the effect of confined liquid between the bodies has some serious implications on the safety and operation of the offloading system. The main objective of the work is to determine the hydrodynamic behaviour of two bodies freely floating in water. A frequency domain method is adopted for the prediction of the resonant frequency. 3D linear diffraction radiation analysis is used to solve the problem. Structures are modelled in ANSYS AQWA and analysed in selected range of frequency with different spacing. As the spacing increases the resonant frequency in roll is found to be decreasing for both ship and tugboat and the frequency shift between the two is increasing. The wave elevation pattern within the spacing has been observed and the result has been shown for different spacings.

Hydrodynamic Behaviour of Very Large Floating Structures (VLFS) in Waves

PAMM ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 531-532
Author(s):  
Marcel König ◽  
Daniel Ferreira González ◽  
Moustafa Abdel-Maksoud ◽  
Alexander Düster
Keyword(s):  
Floating Structures ◽  
Hydrodynamic Behaviour ◽  
Very Large Floating Structures

Specificity of preparation for production for construction of composite and reinforced concrete floating structures

2015 ◽  
Vol 0 (2) ◽  
Author(s):  
Alexandr S. Rashkovskyi ◽  
Alexandr V. Shchedrolosiev ◽  
Natalia V. Tsykalo
Keyword(s):  
Reinforced Concrete ◽  
Floating Structures

On the automodel properties of the counter-current regurlarly stacked trickle bed columns

1986 ◽  
Vol 51 (2) ◽  
pp. 295-301 ◽  
Author(s):  
Andrzej Gierczycki ◽  
Vladimír Staněk ◽  
Petr Vychodil ◽  
Vladimír Jiřičný ◽  
Jerzy Pikoń ◽  
...  
Keyword(s):  
German Democratic Republic ◽  
Democratic Republic ◽  
Liquid Velocity ◽  
Empirical Correlations ◽  
Hydrodynamic Behaviour ◽  
Trickle Bed ◽  
Counter Current

An approach utilizing the automodel properties in describing the hydrodynamic behaviour of counter-current columns has been extended to regularly stacked beds. Two new kinds of the packing have been investigated: The so-called K-packing, developed in the German Democratic Republic and the Cellular packing, developed in Poland. The results of experiments have been presented in the form of plots of the normalized liquid hold-up, hp, versus the normalized liquid velocity, Ql, and two empirical correlations. A comparison with previous results with randomly packed counter-current trickle bed columns has also been made.

The hydrodynamic behaviour of biologically inspired bristled shark skin vortex generator in submarine

2021 ◽  
Author(s):  
Elango Natarajan ◽  
Lídio Inácio Freitas ◽  
Goh Rui Chang ◽  
Ammar Abdulaziz Majeed Al-Talib ◽  
C.S. Hassan ◽  
...  
Keyword(s):  
Vortex Generator ◽  
Biologically Inspired ◽  
Shark Skin ◽  
Hydrodynamic Behaviour

A Phenomenological Model for Vortex-Induced Motions of the Monocolumn Platform and Comparison With Experiments

2009 ◽  
Author(s):  
Guilherme F. Rosetti ◽  
Rodolfo T. Gonc¸alves ◽  
Andre´ L. C. Fujarra ◽  
Kazuo Nishimoto ◽  
Marcos D. Ferreira
Keyword(s):  
Time Domain ◽  
Phenomenological Model ◽  
Structural Model ◽  
Design Phase ◽  
Van Der Pol ◽  
Floating Structures ◽  
Towing Tank ◽  
Wake Oscillator ◽  
Two Degree Of Freedom ◽  
Comparison With Experiments

Vortex-Induced Motions (VIM) of floating structures is a very relevant subject for the design of mooring and riser systems. In the design phase, Spar VIM behavior as well as Semi Submersible and Tension Leg Platform (TLP) flow-induced motions are studied and evaluated. This paper discusses flow-induced behavior on the Monocolumn concept by presenting a phenomenological model and comparing its results with a set of experiments that took place in the IPT Towing Tank - Brazil (September 2008). The experimental results have shown some fundamental differences from previous VIM tests on other units such as Spars. This numerical model attempts to identify these disparities in order to better understand the mechanics of this phenomenon. The model is based on a time-domain, two degree-of-freedom structural model coupled with a van der Pol type wake oscillator. The comparison was performed in order to calibrate the model, to study and better understand the tests results, and finally to identify important aspects to investigate in further experiments.

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