Ship and ocean engineering flows is a very complex and highly non-linear problem. Traditional experimental methods and potential flow theory have limitations in predicting the complex flows. A CFD solver naoe-FOAM-SJTU is ...

Different approaches for specifying the ratio of modelled-to-total dissipation ( fε) in the PANS model, based on the k −ω SST model, are evaluated for different ratios of the modelled-to-total kinetic energy, fk. ...

In this paper, the CFD technology widely used in biomimetic applications is firstly reviewed in a brief manner. We then present two types of computational models employed in studies of ray-finned fishes: single-fin model ...

Since the last 70s, the integral formulations solving the Ffowcs Williams-Hawkings equation ar the standard approach for the prediction of noise generated by a body moving in a fluid flow and, in particular, propulsion ...

We propose a numerical pipeline for shape optimization in naval engineering in- volving two different non-intrusive reduced order method (ROM) techniques. Such methods are proper orthogonal decomposition ...

For the economical operation of wave energy converts (WECs), energy maximising control systems (EMCSs) are included in the device design, introducing large structural motions. During the numerical modelling of ...

An Ultimate Limit State (ULS) based design tool has been developed, which calculates discrete 2D ship sections for computational efficiency, while supporting a 3D geometry model. This tool, called Brokkr, uses a medium ...

Progress in the assessment of multifidelity techniques for ship hull form optimisation at MARIN is described. Surrogate-based optimisation is used, with response surfaces found from a combination of free-surface potential-flow ...

In this paper, we present the ongoing developments of a novel computational model for non-linear water waves that aims to provide a suitable framework for wave-structure inter- action. The proposed model is based on ...

Steady free surface flow is often encountered in marine engineering, e.g. for calculating ship hull resistance. When these flows are solved with CFD, the water-air interface can be represented using a ...

The classic aquaculture units are flexible net structures where loads from the marine environment are drag-dominated. Such systems are normally analysed using computer intensive dynamic hydro-elastic analysis. The current ...

Microbubble drag reduction technology has been proved by many experiments that it can reduce frictional resistance of ships significantly. The underlying physical mechanism of drag reduction needs to be studied by means ...

Maritime transport is responsible for an annual emission of around 1000 million tonnes of CO2, which is around 2.5% of the global greenhouse gas emissions. Nowadays, ships are designed using simplified operational profiles ...

A hydrodynamic design procedure is presented, combining multi-objective sampling, metamodeling, and optimization. A design study of a flapped surface for a passenger hydrofoil is discussed. Hydrodynamics, stability ...

In this paper, we discuss the effects of the body curvature on the high-forward-speed water entry problem. The flow caused by aircraft ditching or planing craft slamming is characterized by a complex time-dependent wetness ...

This paper presents an investigation of roughness application on marine propellers in order to alter their tip vortex properties, and consequently mitigate tip vortex cavitation. SST k − ω model along ...

Military frigates develop an essential tactical element and have a great importance in all navies operations around the world since they provide marine and submarine surveillance, as well as support for different emergencies, ...

The paper presents the first series of results obtained in an ongoing validation and verification study of inter-dynamic OpenFOAM solver framework on a new set of high quality experimental tests performed on a large ...

A numerical model for the determination of the deformed shape of nets under consideration of hydrodynamic loads and elastic twines is presented. The hydrodynamic forces are incorporated using Morison's formula and force ...

Abstract. In this paper a comparison between RANSE simulations carried out with the k − ω SST turbulence model and γ−R˜eθt transition model, and experimental measurements for marine propeller P4119 is made. The ...

The coastal areas are facing serious erosion problems. The increasing urban pressure on coastal areas and the continuous shoreline retreat, lead to the anticipation of significant investments to protect the population ...

Offshore production and export risers in deep-water oil and gas applications are highly slender and flexible cylindrical structures subject to complex environmental and operational loading conditions. In particular, catenary ...

The multi-fidelity machine learning framework proposed in this paper leverages a probabilistic approach based on Gaussian Process modeling for the formulation of stochas- tic response surfaces ...

A new design procedure has been proposed for optimum marine propellers operating in uniform and radially non-uniform inflows based on a vortex lattice lifting-surface model (VLM). The procedure consists of two stages. In ...

Drive trains of icebreakers in arctic conditions are subjected to high stress levels. Due to collisions between ice and propeller, overloads and torsional vibrations occur. The main objective of the “Arctic Thruster ...

In recent years, the Energy Efficiency Design Index (EEDI) regulations for global GreenHouse Gas (GHG) reduction has been strictly updated. From these back ground, environmentally friendly operation and propulsion systems ...

Although a Large Diameter Propeller (LDP) has a significant potential to improve a vessel propulsive efficiency, it may have a higher risk of propeller emergence and thus thrust reduction relative to a conventional ...

In this paper, direct CFD zig-zag simulations of 10°/10° and 20°/20° are performed in deep water condition under the consideration of different degrees of freedom, namely 3 DOF, 4 DOF, and 6 DOF, to evaluate ...

The steady flows and hydrodynamic performances of a propeller without and with the Propeller Boss Cap Fins (PBCFs) are simulated by solving the Reynolds-averaged Navier-Stokes (RANS) equations using the software package ...

Numerical study of roughness effects at an actual ship scale is performed. The roughness models which are based on the two equation turbulence model are employed. First, the roughness models are examined ...

This paper presents a comparison of towing tank testing, ship scale computational fluid dynamics (CFD) simulations, sea trial measurements and in-service performance. The study includes extensive convergence ...

The optimization study of the ship pedestal structure is of great significance to the lightweight and the anti-shock performance of the ship. Therefore, the TOSCA software is used to design the ship pedestal in topology ...

The main objective of the present study is to propose a numerical scheme to model irregular wave systems through a Lagrangian, particle-based numerical method, namely, Smoothed Particle Hydrodynamics (SPH). A numerical ...

In this paper, an experimental and numerical study of a floating object is presented. The incorporation of both experimental and numerical tools for the investigation of a simple floating object provides ...