scholarly journals A Numerical Study on Hydrodynamic Interaction between Oblique Ship Hull and Rudder

2002 ◽  
Vol 2002 (192) ◽  
pp. 113-120
Author(s):  
Susumu Tanaka ◽  
Koyu Kimura
Keyword(s):  
Hydrodynamic Interaction ◽  
Numerical Study ◽  
Ship Hull

Experimental Investigation of Ice Mass Hydrodynamic Interaction With Offshore Structure in Close Proximity

2015 ◽  
Author(s):  
Tanvir Mehedi Sayeed ◽  
Bruce Colbourne ◽  
Heather Peng ◽  
Benjamin Colbourne ◽  
Don Spencer
Keyword(s):  
Hydrodynamic Interaction ◽  
Impact Load ◽  
Numerical Study ◽  
Numerical Models ◽  
Offshore Structures ◽  
Ocean Engineering ◽  
Offshore Structure ◽  
Area Of Interest ◽  
Close Proximity ◽  
The Impact

Iceberg/bergy bit impact load with fixed and floating offshore structures and supply ships is an important design consideration in ice-prone regions. Studies tend to divide the iceberg impact problem into phases from far field to contact. This results in a tendency to over simplify the final crucial stage where the structure is impacted. The authors have identified knowledge gaps and their influence on the analysis and prediction of iceberg impact velocities and loads (Sayeed et. al (2014)). The experimental and numerical study of viscous dominated very near field region is the main area of interest. This paper reports preliminary results of physical model tests conducted at Ocean Engineering Research Center (OERC) to investigate hydrodynamic interaction between ice masses and fixed offshore structure in close proximity. The objective was to perform a systematic study from simple to complex phenomena which will be a support base for the development of subsequent numerical models. The results demonstrated that hydrodynamic proximity and wave reflection effects do significantly influence the impact velocities at which ice masses approach to large structures. The effect is more pronounced for smaller ice masses.

Numerical study on the dynamic response of a truncated ship-hull structure under asymmetrical slamming

2020 ◽  
Vol 72 ◽  
pp. 102767 ◽  
Author(s):  
Hang Xie ◽  
Fang Liu ◽  
Haoyun Tang ◽  
Xinyu Liu
Keyword(s):  
Dynamic Response ◽  
Numerical Study ◽  
Ship Hull ◽  
Hull Structure

scholarly journals Modelling the interaction between relativistic and non-relativistic winds in binary pulsar systems: strong magnetization of the pulsar wind

2019 ◽  
Vol 490 (3) ◽  
pp. 3601-3607 ◽  
Author(s):  
S V Bogovalov ◽  
D Khangulyan ◽  
A Koldoba ◽  
G V Ustyugova ◽  
F Aharonian
Keyword(s):  
Hydrodynamic Interaction ◽  
Rotation Axis ◽  
Numerical Study ◽  
Large Area ◽  
Maximum Enhancement ◽  
Optical Star ◽  
Pulsar Wind ◽  
The Impact ◽  
Weak Wind ◽  
The Magnetic Field

ABSTRACT We present a numerical study of the properties of the flow produced by the collision of a magnetized anisotropic pulsar wind with the circumbinary environment. We focus on studying the impact of the high wind magnetization on the geometrical structure of the shocked flow. This work is an extension of our earlier studies that focused on a purely hydrodynamic interaction and weak wind magnetization. We consider the collision in the axisymmetric approximation, i.e. the pulsar rotation axis is assumed to be oriented along the line between the pulsar and the optical star. The increase of the magnetization results in the expansion of the opening cone in which the shocked pulsar wind propagates. This effect is explained in the frameworks of the conventional theory of collimation of magnetized winds. This finding has a direct implication for scenarios that involve Doppler boosting as the primary mechanism behind the GeV flares detected with the Fermi Large Area Telescope from PSR B1259−63/LS 2883. The maximum enhancement of the apparent emission is determined by the ratio of 4$\pi$ to the solid in which the shocked pulsar wind propagates. Our simulations suggest that this enhancement factor is decreased by the impact of the magnetic field.

Numerical study on the hydrodynamic interaction between two floating platforms in Caspian Sea environmental conditions

2019 ◽  
Vol 188 ◽  
pp. 106273 ◽  
Author(s):  
Hamid Reza Ghafari ◽  
Mohammad Javad Ketabdari ◽  
Hassan Ghassemi ◽  
Esmaeil Homayoun
Keyword(s):  
Environmental Conditions ◽  
Caspian Sea ◽  
Hydrodynamic Interaction ◽  
Numerical Study ◽  
Floating Platforms

scholarly journals Homogeneous Wave Load Effects on the Connections of Main Parts of Side-Anchored Straight Floating Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Meysam Rajabi ◽  
Hassan Ghassemi ◽  
Hamidreza Ghafari
Keyword(s):  
Hydrodynamic Interaction ◽  
Numerical Study ◽  
Wave Force ◽  
Wave Forces ◽  
Mooring System ◽  
Wave Direction ◽  
Wave Load ◽  
Mooring Lines ◽  
Homogeneous Wave ◽  
Floating Bridge

In this paper, a numerical study is presented to investigate wave force on the connections of main parts of a side-anchored straight floating bridge concept for the Bjørnafjorden fjord crossing. The floating bridge is supported by 18 pontoons, and three groups of mooring lines are employed to restrain the bridge against horizontal loads and increase its transverse stiffness. The created wave forces at the connections of pontoon-column and column-girder of the floating bridge considering the effects of short-crested and long-crested waves, varying wave direction, hydrodynamic interaction between pontoons, and mooring system are analyzed. It is found that short-crested and long-crested waves depending on their direction decrease or increase the wave forces on the joints. Considering that the effect of hydrodynamic interaction between pontoons can increase or reduce the wave forces and moments created in the joints, which means the neglect of the hydrodynamic interaction effects between the pontoons to simplify the modeling of this type of floating bridge, may be unacceptable. Moreover, the results showed that the bridge mooring system does not merely reduce the wave forces and moments at joints along the bridge.

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