Marine Systems & Ocean Technology
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Computational modelling of free surface flows for offshore application
Marine Systems & Ocean Technology - Tập 3 - Trang 113-122 - 2007
In this paper we discuss the fundamentals of techniques that can be applied to numerically model fluid flows with interfaces. Application of these methods is especially relevant to the impact of waves on offshore structures and ships, but they can more generally be used to model any situation including the effect of tsunamis on on-shore structures, the release of large volumes of gas from undersea......
Computational modeling applied to the study of wave energy converters (WEC)
Marine Systems & Ocean Technology - - 2014
Transient point load induced response of Kirchhoff’s plate with translationally constrained edges: aircraft landing on floating airports
Marine Systems & Ocean Technology - Tập 12 - Trang 252-261 - 2017
Dynamic analysis of thin rectangular elastically supported plates to transient loads is presented. A floating airport is modeled as a horizontal Kirchhoff’s plate, which is elastically supported at the ends, and is subjected to the impact of aircrafts landing and deceleration over its length. This sets the free–free–free–free plate into high-frequency vibration, causing flexural stress waves to tr......
VIV control and drag reduction with no moving parts
Marine Systems & Ocean Technology - Tập 3 - Trang 87-93 - 2007
This paper presents a new passive VIV (Vortex Induced Vibrations) suppression device that also leads to drag reduction. The device uses the guided porosity concept and is applied in experimental tests conducted for low mass ratio cylindrical models. It is shown that the transversal VIV amplitude is reduced. It is also shown that there is a simultaneous reduction of the drag forces in contrast with......
Important trends and junctures in warship design
Marine Systems & Ocean Technology - Tập 15 - Trang 135-150 - 2020
Concerns about risks associated with new conceptual designs of surface warships have led many decision-makers to rely on the parent-design approach. For example, the design of the Oliver Hazard Perry Class (FFG-7) became the standard of surface warship design for 71 subsequent vessels in three Navies, e.g. Australia, Spain and Taiwan, even though the FFG-7 was initially considered under-armed and ......
Design improvement of flapping hydrokinetic turbines
Marine Systems & Ocean Technology - Tập 15 - Trang 175-187 - 2020
This investigation deals with the flow control and the enhancement of the output power of a flapping foil turbine. The connected gurney flap (GF) is a small arc that oscillates with a given pitching angle. The incompressible laminar flow around a simple flat plate equipped with an oscillating gurney flap is solved using a computational method. A user-defined function and a coupled layering/sliding......
Numerical investigations of micro bubble drag reduction effect for container ships
Marine Systems & Ocean Technology - Tập 16 - Trang 199-212 - 2021
In the course of the most recent decades reduction of ship resistance and saving fuel consumption to accomplish higher speed with reduction of pollutants has been the significant subject for researchers. Micro bubble drag reduction technique is one of the most interesting thoughts in this field owing to its great advantages, such as considerable potential drag reduction, easy operations, environme......
Effect of turbulence intensity on the linear quadratic control of spar buoy floating wind turbines
Marine Systems & Ocean Technology - Tập 16 - Trang 84-98 - 2021
This paper evaluates the performance of a linear quadratic (LQ) optimal controller designed for a spar buoy floating offshore wind turbine (FOWT) considering different wind turbulence conditions. To account for the uncertainty in offshore wind turbulence intensity (TI), three levels of TI are adopted in the above rated wind speed region. The TI levels of 15%, 11% and 5% are based on an internation......
A Non-Linear Mathematical Model of Higher Order for Strong Parametric Resonance of the Roll Motion of Ships in Waves
Marine Systems & Ocean Technology - Tập 1 - Trang 69-81 - 2005
Non-linear equations of ship motions in waves describing the couplings between heave, roll and pitch are investigated. A third order mathematical model is introduced, aimed at describing strong parametric excitation associated with cyclic changes in the ship restoring characteristics. A derivative model is employed to describe the coupled restoring actions up to third order. Non-linear coupling co......
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