As wind turbines increase in size, blades become longer, thinner, and more flexible, making them susceptible to large geometric nonlinear deformations, which pose challenges for aeroelastic simulations. This study presents a model that accounts deformations of slender, flexible blades, coupled through the Actuator Line Method (ALM) Geometrically Exact Beam Theory (GEBT). The accuracy is validated by comparing it with established numerical methods, demonstrating its ability capture...

This paper presents an integrated analysis about dynamic performance of a Floating Offshore Wind Turbine (FOWT) OC4 DeepCwind with semi-submersible platform under real sea environment. The emphasis this is to investigate how the wave mean drift force and slow-drift excitation load (Quadratic transfer function, namely QTF) influence motions, mooring line tension tower base bending moments. Second order potential theory being used for computing linear nonlinear effects, including first force,...

The aim of the paper is to propose a groundbreaking method for aerodynamic optimization design bioinspired wing with leading-edge tubercles. An emphasis on spanwise waviness in leading edge delaying stall and increasing lift from performance perspective has been laid this study. For conversion wavy configuration, form parameterized approach using F-spline curves used produce more variants Numerical investigations flow characteristics which are performed CFD computations have validate...

Blade icing often occurs on wind turbines in cold climates. has many adverse effects turbines, and the loss of output power is one most important effects. With increasing emphasis clean energy around world, design production tend to be large-scale. So this paper selected 15 MW turbine provided by NREL (American Renewable Energy Laboratory) study influence blade power. In paper, a multi-program coupled analysis method named CFD-WTIC-ILM (CFD: Computational fluid dynamics; WTIC: Wind Turbine...

A series of tests in an ice tank was carried out using a model-scale ship to investigate the loading process. The model Uikku mounted on rigid carriage and towed through level field Marine Technology Group at Aalto University. speed thickness were varied. In this paper, process described corresponding forces horizontal plane analysed. new method is proposed decompose different force components from total measured tests. This analysis beneficial understanding contributions each component...

This paper quantitatively studies the transient dynamic response of a semi-submersible production platform with loss one or several positioning mooring lines. A platform, risers, and lines are all included in numerical simulation. Increased motion tension variation remaining lines/risers risk line riser clashing investigated through fully coupled time-domain analysis. Combined environmental loads selected from irregular waves steady current varying very rough to extreme sea conditions. Three...

Technology innovation has led to an increase in floating wind turbine size aimed at releasing the pressure on capital cost and increasing its capacity factor. Large-size turbines pose high challenges regarding design with essential structure reliability. The dynamic performance of integrated 15-megawatt (MW) under extreme sea loads is investigated this paper. Platform motions, mooring system positioning forces, sizeable blades, tower behaviors are all studied targeted typhoon condition...

The full exploitation of offshore wind resources can essentially satisfy the massive energy demand. realization and application ultra-high-power turbines are crucial to achieving use deep-sea reducing cost power. For VolturnUS-S semi-submersible floating foundation a 15 megawatt (MW) turbine, effect structural parameters on hydrodynamic performance was investigated by controlling variables described in this paper. Accordingly, optimized coupled MW turbine. dynamic integrated turbine analyzed...

Climate change in recent years has produced viable shipping routes the Arctic. However, critical uncertainties related to maritime operations Arctic make it difficult predict ship speeds ice and, thus, voyage time and fuel costs. Cost–benefit analysis of alternative based on accurate environmental condition modeling is required. In this context, paper presents a holistic approach that considers major voyage-related costs trans-Arctic route as an conventional via Suez Canal Route (SCR) for...

A numerical method is proposed to simulate level ice interaction with ship in transverse and longitudinal directions time domain. novel non-symmetric force a stochastic way. On the basis of observations from model tests, simulation combines bending acting on waterline, submersion below waterline friction forces caused by floes rotation amidships. In simulations was fixed towed through an intact sheet at certain speed. The setup similar tank as much possible. simulated results are compared...

This research tackles the challenge of ice-induced vibrations in fixed-bottom offshore wind turbines, particularly risk frequency lock-in (FLI), a critical loading condition arising from slow ice movement against structures. We introduce an innovative FLI analysis process grounded ductile damage–collapse (DDC) mechanism, which offers more accurate and significantly lower probability occurrence than conventional methods. Through dynamic evaluations employing time-domain load model...

In this paper, a comprehensive computational modeling study of the unsteady aerodynamic environment around warship with helicopter is performed. An experimental validation exercise also conducted, comparing fluid dynamics (CFD) results airwake calculated for reduced-scale model isolated Landing Helicopter Assault (LHA) high-quality particle image velocimetry data provided by NASA AMES Research Center. Comparisons generally obtain agreement, indicating that CFD numerical method able to...

The Arctic region is rich in oil and gas resources, but exploitation of resources there always facing great challenge. Floating offshore platform considered as a practical choice for exploration the deep water regions. One key technologies positioning system design under harsh arctic sea loads. In this paper, comprehensive investigated. A coupled numerical model composed mooring-assisted dynamic Kulluk established. 16 different combination forms are selected capability evaluated by analyzing...

Mooring system design of a floating offshore structure in the arctic region is considered to be extremely important. This paper aims at investigating an optimal mooring for Kulluk platform operating Beaufort Sea, which has ice-free and ice-covered conditions during whole year time. In order complete layout satisfy year-round operation, both effect wave loads ice should considered. The research establishes coupled numerical production composed system. Wave load solved by potential flow...