To fully understand the performance of tidal stream turbines for the creation of ocean ren wable energy, a range of computational models is required. We review and compare results from several ...

The paper is about the development of a fluid-dynamic model for simulating the behaviour of a device for the production of electric energy based on an oscillating water column (OWC). First of all it has ...

This paper presents a numerical study on an innovative system for converting energy from waves. It consists of a point pivoted body which oscillates in presence of waves. The system uses a linear electrical generator ...

A progressive increasing in turbine dimension has characterized the technological evelopment in offshore wind energy utilization. This aspect reflects on the growing in blade length and ...

The problem of maximizing the performances of a U-OWC wave energy converter in a variet of environmental conditions is investigated. Specifically, the paper compares two control strategies coupling the U-OWC – PTO ...

The Oscillating Water Column is one of the oldest concepts for wave energy harvesting. T e device optimization is still a crucial point for the commercial-scale diffusion of this technology. Therefore, ...

In this paper, multi-disciplinary optimization techniques are applied to sail design. Two different mathematical models, providing the solution of the fluid-dynamic and the structural problems governing the ...

Application of interpolation/approximation techniques (metamodels, for brevity) is commonly adopted in numerical optimization, typically to reduce the overall execution time of the optimization process. A limited ...

This paper presents the development of a novel automatic lineheating forming machine based on intensive application of the numerical simulation and artificial intelligence. The forming of certain parts of the ...

A procedure for optimizing the aft body of a ship for minimal power and best wake field quality is described, based on full-scale RANS computations possibly including free- surface effects. A flexible and ...

In the presented research study, a parametric model of a bulk carrier design is utilized in order to explore the technical and economic ship design features (design attributes) in the frame of a ...

This paper focuses on the application of mortar-based isogeometric analysis to predict contact between subsea pipelines and trawl gear. The contact constraints are satisfied exactly with the augmented Lagrangian ...

Direct CFD simulation of ship and submarine maneuvers including moving rudders and propellers has become possible though it is still computationally expensive. The inclusion of waves results in further complexity and ...

A numerical model is developed to investigate the structural performance and stress distribution of floating pipes of fish cage subjected to the flow. The modeling approach is based on the joint use of the ...

This study continues [1] the examination of the long-term global response of a floating vertical axis wind turbine (VAWT) situated off the Portuguese coast in the Atlantic Ocean. The VAWT, which consists ...

The paper presents SSPA’s work in the EU project AQUO to predict underwater radiated noise (URN) generated by a coastal tanker with a cavitating propeller. A CFD method, consisting of a multi-phase Delayed Detached Eddy ...

Multi-objective optimization combined with numerical simulation are useful tools for environmental sciences. Using these methods, the treatment and discharge of wastewater in large waterbodies (estuaries, ...

Haeundae Beach is sandy beach at Busan, Korea. Haeundae Beach is about 1.5 km- long enclosed by two headlands. The normal direction of the beach is between south and south-east. Tidal current at the ...

In this work, we propose to implement the V2- f turbulence model rarely used in the marine environment to study the marine bottom boundary layer (MBBL). This model will complete the series of the turbulence models ...

The conducted research investigations aimed to carry out an identification of the constructional materials fatigue state of the ship propulsions’ rotational mechanical units for diagnostic purposes. The fatigue ...

This paper outlines the development of a numerical model for granular cargo on bulk carriers. In order to study the vessel behaviour including the motion of the load, a monolithic approach is chosen to model the ...

The article has been worked out on the basis of the report devoted to the conducted diagnostic investigations of the ship main propulsion unit’s mechanical system. Gdansk University of ...

Two approaches for CFD simulations for a complex geometry of a ship with an energy-saving duct are compared. One method is an unstructured grid method in which the single block grid can cover the whole ...

Flettner Rotors (FR) are spinning cylinders, which produce fluid dynamic lift by using the Magnus Effect. The Magnus force can be much greater in magnitude than the wing lifting force, given the same projected area and ...

EEDI (Energy Efficiency Design Index) came into effect mandatory in Jan. 2013, and the ship owners definitely required a higher efficiency propulsion system than ever before. Hence, the shipyards have been ...

The paper is devoted to the analysis of the unsteady hydrodynamic processes taking place in the ship wake under shallow water conditions. The motivation of the research is the determination of the reasons ...

This work deals with the design of the propulsion system of a modular AUV (Autonomous Underwater Vehicle). The authors describe the design methodologies and the testing devices used for the fast ...

In this paper numerical computations dedicated to the analysis of the maneuvering behavior of a fully appended submarine are presented. The work presented here is part of the CNR-INSEAN activities scheduled in the ...

Two numerical models based on the solution of the RANS equations using the SST k-ω turbulence model have been employed to investigate the hydrodynamic performance and flow of tunnel thrusters. The flow passages ...

The flow field generated by the towing of a semi-displacement hull, free to heave and pitch, is numerically investigated in the velocity range 18 34 Kn. The numerical code adopted is ...

The Paper focusses on the development of a numerical method to simulate ship motions under arbitrary external forces. Based on impulse response functions, the de- veloped method benefits from the computational ...

Wind Turbines constitute a sustainable and effective solution for the production of energy using wind power. Offshore wind turbines especially are becoming of special interest. However, their design poses great ...

Ocean waves constitute an extensive energy resource, whose extraction has been the subject of intense research activity in the last three decades. Among the different variants of Wave Energy Converters, the ...

Dive deep into the fascinating world of real-time computational fluid dynam- ics. We present details of our GPU-accelerated flow solver for the simulation of non-linear violent flows in marine and coastal engineering. ...

This paper reports on the applicability of the Lattice Boltzmann based free surface flow solver elbe to the simulation of complex ship-ice interactions in marine engineering. In order to model the dynamics ...

In this paper, viscous flow calculation using a RANS method are presented for two marine propellers in open-water conditions at model-scale. A verification study from a range of geometrically similar grids ...

This paper presents a CFD decomposition model for free surface, viscous, in- compressible flows related to marine hydrodynamics. The solution decomposition is based on Spectral Wave Explicit Navier Stokes Equations ...

A Chaotic Iterative Method, which is a form of totally asynchronous linear equation-system solver, is implemented within an open-source framework. The solver is similar to simple Jacobi or Gauss-Seidel ...

Hydroelastic response of floating structures is of interest as they have various fields of applica ion including waterfront infrastructure, off-shore wind farms, LNG terminals, etc. This paper presents a numerical ...

In many ocean engineering, vortex induced vibration of slender structures such as a riser has long been a nemesis to be investigated and yet to be fully understood. Numerous experimental and computational ...

The 3D finite element analysis software X-SEA has been developed to solve the offshore structures including oil & gas platforms and wind turbine farms. The current version of X-SEA combining with the pre& post ...

In this research, an evaluation of a frontal collision of a tanker with bulbous bow against a rigid structure was performed by reproducing experimentally this scenario in reduced scale and by numerical modeling ...

Various fluid oscillations in a closed vessel have been numerically simulated. The statements of the problems correspond to the situations that arise in the fuel tanks of vessels in collisions with ice barriers and ...

Meta-modelling is a key technique for efficient multi-objective optimization in ship design projects using CFD. However, objective functions computed with CFD are not deterministic functions but contain random ...

New regulations ruling energy efficiency on board ships and the development of oil prices underline the importance of fuel economy to all commercial ship operations. The design of RoPAX ships is usually optimised for one ...

This work aims to model flow around rigid cylinder beneath to a free surface by using a particle based Lagrangian method, namely, Smoothed Particle Hydrodynamics (SPH) which has clear advantages on modeling ...

The paper presents an original design of autonomous underwater vehicles where thrust forc is created by the helicoidal shape of hull rather than screw propellers. The contra- rotating bow and stern parts ...

The availability of a high-performance navigation state estimator is fundamental to Autonomous Underwater Vehicles (AUVs), especially when multiple vehicles are involved in autonomous tasks. The underwater environment ...