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Technologies to harvest marine renewable energies (MREs) are at a pre-commercial stage, and significant R&D progress is still required in order to improve their competitiveness. Therefore, hybridization presents a significant potential, as it fosters synergies among the different harvesting technologies and resources. In the scope of this Special Issue, hybridization is understood in three different manners: (i) combination of technologies to harvest different MREs (e.g., wave energy converters combined with wind turbines); (ii) combination of different working principles to harvest the same resource (e.g., oscillating water column with an overtopping device to harvest wave energy); or (iii) integration of harvesting technologies in multifunctional platforms and structures (e.g., integration of wave energy converters in breakwaters). This Special Issue presents cutting-edge research on the development and testing of hybrid technologies for harvesting MREs and intends to inform interested readers on the most recent advances in this key topic.

vertical axisymmetric floaters --- arbitrary shape --- breakwater --- diffraction and radiation problem --- hydrodynamic characteristics --- added mass --- damping coefficient --- marine renewable energy --- wind energy --- solar energy --- resource assessment --- hybrid energy systems --- power take-off damping --- wave power device --- experimental testing --- PTO simulator --- uncertainty analysis --- wave energy testing --- experimental set-up --- calibration --- Computational Fluid Dynamics (CFD) modelling --- physical model testing --- Hybrid-Wave Energy Converter (HWEC) --- composite modelling approach --- Oscillating Water Column (OWC) --- Overtopping Device (OTD) --- multi-purpose breakwater --- wave power --- oscillating buoy --- power generation performance --- standing waves --- experimental research --- physical modelling --- wave energy --- breakwaters --- safety --- overtopping --- stability --- offshore wind energy --- CECO --- WindFloat Atlantic --- co-located wind–wave farm --- n/a --- co-located wind-wave farm

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This Special Issue contains 12 papers devoted to fluid/structure interaction (FSI) problems. The main feature of the problems is an interface on which consistent boundary conditions for both the liquid and the solid regions are formulated. The presented studies cover a wide range of problems and methods for their solution, including problems of weak, or one-way interaction, in which the effect of interface deformation on the fluid flow can be neglected, as well as problems of the strong interaction, for which the interface change affects both the flow and the structure behaviour. The interest in FSI problems is very great due to their practical importance. Recent developments in engineering have led to advanced formulations of FSI problems. Some of them could not be formulated several years ago. The presented papers demonstrate progress in both numerical algorithms, mathematical apparatus and advanced computational techniques. In this issue, we have tried to collect different FSI problems, new mathematical and numerical approaches, new numerical techniques and, of course, new results, which can provide an insight into FSI processes.

Technology: general issues --- History of engineering & technology --- vortex-induced vibration --- higher mode --- flexible pipe --- oscillatory flow --- motion trajectory --- lock-in --- dominant frequency --- time-varying --- lifeboat --- freefall --- ship motion --- Kane’s method --- one-way coupling --- CFD-DEM --- ice resistance --- ice crack --- fluid–structure interaction --- flexible beam --- high speed imaging --- system coupling --- coastal structure --- fluid-structure interaction --- engineering design parameters --- environment protection --- intake velocity --- velocity cap --- axial hydraulic force --- stress --- deformation --- pump turbine --- starting-up --- cutting ratio --- codend --- hydrodynamic characteristics --- fluttering motions --- the Fourier series --- marine centrifugal pump --- vibration excitation source --- fluid excitation --- electromagnetic excitation --- numerical simulation --- OpenFOAM --- one-way approach --- structural analysis --- open water test --- computational fluid dynamics --- numerical analysis --- fluid mechanics --- blade design --- propeller --- hydraulic machinery runner --- wet modal analysis --- acoustic–structure coupling --- boundary condition --- marine growth --- hydrodynamic loading --- roughness --- mussels --- morison coefficients --- cavity detachment --- free streamlines --- Brillouin criterion --- n/a --- Kane's method --- acoustic-structure coupling

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This Special Issue contains 12 papers devoted to fluid/structure interaction (FSI) problems. The main feature of the problems is an interface on which consistent boundary conditions for both the liquid and the solid regions are formulated. The presented studies cover a wide range of problems and methods for their solution, including problems of weak, or one-way interaction, in which the effect of interface deformation on the fluid flow can be neglected, as well as problems of the strong interaction, for which the interface change affects both the flow and the structure behaviour. The interest in FSI problems is very great due to their practical importance. Recent developments in engineering have led to advanced formulations of FSI problems. Some of them could not be formulated several years ago. The presented papers demonstrate progress in both numerical algorithms, mathematical apparatus and advanced computational techniques. In this issue, we have tried to collect different FSI problems, new mathematical and numerical approaches, new numerical techniques and, of course, new results, which can provide an insight into FSI processes.

vortex-induced vibration --- higher mode --- flexible pipe --- oscillatory flow --- motion trajectory --- lock-in --- dominant frequency --- time-varying --- lifeboat --- freefall --- ship motion --- Kane’s method --- one-way coupling --- CFD-DEM --- ice resistance --- ice crack --- fluid–structure interaction --- flexible beam --- high speed imaging --- system coupling --- coastal structure --- fluid-structure interaction --- engineering design parameters --- environment protection --- intake velocity --- velocity cap --- axial hydraulic force --- stress --- deformation --- pump turbine --- starting-up --- cutting ratio --- codend --- hydrodynamic characteristics --- fluttering motions --- the Fourier series --- marine centrifugal pump --- vibration excitation source --- fluid excitation --- electromagnetic excitation --- numerical simulation --- OpenFOAM --- one-way approach --- structural analysis --- open water test --- computational fluid dynamics --- numerical analysis --- fluid mechanics --- blade design --- propeller --- hydraulic machinery runner --- wet modal analysis --- acoustic–structure coupling --- boundary condition --- marine growth --- hydrodynamic loading --- roughness --- mussels --- morison coefficients --- cavity detachment --- free streamlines --- Brillouin criterion --- n/a --- Kane's method --- acoustic-structure coupling

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CFD is an emerging area and is gaining popularity due to the availability of ever-increasing computational power. If used accurately, CFD methods may overcome the limitations of experimental and other numerical methods, in some respects. This Special Issue focuses on Computational Fluid Dynamics (CFD) Simulations of Marine Hydrodynamics with a specific focus on the applications of naval architecture and ocean engineering, and it comprises 24 original articles that advance state-of-the-art CFD applications in marine hydrodynamics and/or review the progress and future directions of research in this field. The published articles cover a wide range of subjects relevant to naval architecture and ocean engineering, including but not limited to; ship resistance and propulsion, seakeeping and maneuverability, hydrodynamics of marine renewable energy devices, validation and verification of computational fluid dynamics (CFD), EFD/CFD combined methods, fouling/coating hydrodynamics.

CFD --- shallow water --- restricted water --- KCS --- spectral analysis of free surfaces --- air resistance --- container ship --- superstructure --- numerical simulation --- trim --- dispersion --- pH --- turbulent Schmidt number --- scrubber --- wash water --- ship hydrodynamics --- ship motions --- green water on deck --- slamming --- cross wave --- near free surface --- unsteady cavitation dynamics --- NACA66 hydrofoil --- dynamic mode decomposition --- wave energy --- computational fluid dynamics --- identification --- viscous damping --- URANS --- computational fluid dynamic --- experimental fluid dynamic --- sailboat --- hull --- towing tank test --- numerical ventilation --- overset --- volume of fluid (VOF), hydrodynamic --- Polito Sailing Team (PST) --- offshore crane --- OpenFOAM --- wave-payload interaction --- NWT --- overset mesh --- planing hull --- seakeeping --- vertical motions --- mesh deformation --- computational fluid dynamics (CFD) --- radial basis function (RBF) method --- inverse distance weighted (IDW) method --- hull form optimization --- Computational Fluid Dynamics --- Verification and Validation --- nearfield wake pattern --- longitudinal wake profile --- distributed propulsion --- draft --- parallel-sided --- NACA --- CAD --- systematic investigation --- low Reynolds number --- sailing --- centerboard --- Bézier curves --- gamma transition criterion --- restricted channel --- resistance correction --- biofouling --- ship performance --- oil tanker --- bulk carrier --- immersed boundary method --- air–water two-phase flows --- VoF method --- finite volume method --- interaction effect --- wind drag --- aerodynamic --- Reynolds Average Navier–Stokes (RANS) --- rudder–propeller interactions --- validations and verification --- actuator disk theory --- rudder sectional forces --- marginal ice zone --- sea ice --- wave --- six degree of freedom (6DoF) motion --- planing craft --- twin side-hulls --- porpoising instability --- model tests --- inhibition mechanism --- optimal location --- ship resistance --- form factor --- best practice guidelines --- numerical friction line --- combined CFD/EFD methods --- next generation subsea production system --- Immersed Buoyant Platform --- hydrodynamic characteristics --- ultra-deep sea --- swallowing capacity --- duct flow --- ducted turbine --- roughness effect --- Wigley hull --- heterogeneous hull roughness

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CFD is an emerging area and is gaining popularity due to the availability of ever-increasing computational power. If used accurately, CFD methods may overcome the limitations of experimental and other numerical methods, in some respects. This Special Issue focuses on Computational Fluid Dynamics (CFD) Simulations of Marine Hydrodynamics with a specific focus on the applications of naval architecture and ocean engineering, and it comprises 24 original articles that advance state-of-the-art CFD applications in marine hydrodynamics and/or review the progress and future directions of research in this field. The published articles cover a wide range of subjects relevant to naval architecture and ocean engineering, including but not limited to; ship resistance and propulsion, seakeeping and maneuverability, hydrodynamics of marine renewable energy devices, validation and verification of computational fluid dynamics (CFD), EFD/CFD combined methods, fouling/coating hydrodynamics.

Technology: general issues --- CFD --- shallow water --- restricted water --- KCS --- spectral analysis of free surfaces --- air resistance --- container ship --- superstructure --- numerical simulation --- trim --- dispersion --- pH --- turbulent Schmidt number --- scrubber --- wash water --- ship hydrodynamics --- ship motions --- green water on deck --- slamming --- cross wave --- near free surface --- unsteady cavitation dynamics --- NACA66 hydrofoil --- dynamic mode decomposition --- wave energy --- computational fluid dynamics --- identification --- viscous damping --- URANS --- computational fluid dynamic --- experimental fluid dynamic --- sailboat --- hull --- towing tank test --- numerical ventilation --- overset --- volume of fluid (VOF), hydrodynamic --- Polito Sailing Team (PST) --- offshore crane --- OpenFOAM --- wave-payload interaction --- NWT --- overset mesh --- planing hull --- seakeeping --- vertical motions --- mesh deformation --- computational fluid dynamics (CFD) --- radial basis function (RBF) method --- inverse distance weighted (IDW) method --- hull form optimization --- Computational Fluid Dynamics --- Verification and Validation --- nearfield wake pattern --- longitudinal wake profile --- distributed propulsion --- draft --- parallel-sided --- NACA --- CAD --- systematic investigation --- low Reynolds number --- sailing --- centerboard --- Bézier curves --- gamma transition criterion --- restricted channel --- resistance correction --- biofouling --- ship performance --- oil tanker --- bulk carrier --- immersed boundary method --- air–water two-phase flows --- VoF method --- finite volume method --- interaction effect --- wind drag --- aerodynamic --- Reynolds Average Navier–Stokes (RANS) --- rudder–propeller interactions --- validations and verification --- actuator disk theory --- rudder sectional forces --- marginal ice zone --- sea ice --- wave --- six degree of freedom (6DoF) motion --- planing craft --- twin side-hulls --- porpoising instability --- model tests --- inhibition mechanism --- optimal location --- ship resistance --- form factor --- best practice guidelines --- numerical friction line --- combined CFD/EFD methods --- next generation subsea production system --- Immersed Buoyant Platform --- hydrodynamic characteristics --- ultra-deep sea --- swallowing capacity --- duct flow --- ducted turbine --- roughness effect --- Wigley hull --- heterogeneous hull roughness