The net is regarded as the most critical component in marine aquaculture facilities it only barrier which protects environment from fish escapes. Accurate predictions of cage deformation and drag force on nets are needed, both for ensuring welfare dimensioning mooring system. Thus, an appropriate hydrodynamic model essential. In practice, two types models, i.e., Morison type Screen type, commonly used to calculate forces nets. Application models depends underlying structural availability...

The utilization of floating docks has an inherently higher risk than their ground counterpart and can result in severe accidents due to the possibility stability loss structure failure. To minimize occurrence accidents, it is essential conduct comprehensive testing on dock's behaviours identify potential points failure that could lead using efficient numerical method for assessing dynamic response a dock under accidental conditions. incorporates six-degree-of-freedom (6-DOF) model,...

Floating offshore wind turbines (FOWTs) convert energy to electrical in deeper water areas where installing bottom-fixed is not feasible. However, technological obstacles have be overcome make them cost-effective, with inter-array power cable designs being one of the potential investigated. This study presents a novel configuration suspended cables using subsea buoys between two 5MW OC3-Hywind FOWTs. In this configuration, kept afloat seabed and sea surface by attaching several distributed...

High-pass and Kalman filtering are two digital methods for ship heave acceleration signals. However, the traditional method has dynamic model errors due to dependence on fast Fourier transform (FFT) identification model. The presence of factors such as unknown statistical properties noise anomalous measurement information at same time can cause degradation in accuracy solution or even lead filter divergence. This study proposes an adaptive robust cubature based Sage-Husa estimator (SARCKF)...

Two-dimensional (2D) local scour beneath two submarine pipelines in tandem under wave-plus-current conditions is investigated numerically. A fully-coupled hydrodynamic and morphologic model based on unsteady Reynolds-averaged Navier-Stokes (URANS) equations with the k−ω turbulence closure applied. The validated against existing experimental measurements involving live-bed a single pipeline tandem, respectively. then employed to simulate for variety of Keulegan-Carpenter (KC) numbers relative...

A coupling algorithm between two open-source numerical toolboxes, i.e., OpenFOAM and Code_Aster, is implemented for fluid-structure interaction analysis of submerged nets. This developed to handle the wake effects thin, flexible highly permeable structures with complex geometries. Compared previous approaches, present simplifies procedures model preparation by removing additional data-fitting processes porous coefficients, improves accuracy structural responses employing a fluid solver...

Providing quality fuel to ships with reduced SOx content is a priority task. Marine residual fuels are one of the main sources atmospheric pollution during operation and sea tankers. Hence, International Maritime Organization (IMO) has established strict regulations for sulfur marine fuels. One possible technological solutions allowing adherence limits use mixed However, it carries risks ingredient incompatibilities. This article explores new approach study active sedimentation An assessment...

Large eddy simulations (LES) are carried out to investigate the flow around a vibrating cylinder in subcritical Reynolds number regime at Re = 3900. Three reduced velocities, Ur 3, 5, and 7, chosen wake structures different branches of vortex-induced vibration (VIV) lock-in. The instantaneous vortical identified show coherent behind for various VIV combined effects frequency amplitude oscillation on pattern region, hydrodynamic quantities cylinder, spanwise length scale energetic discussed...

Gravity type fish cages have been commonly used in marine aquaculture for years. However, only limited research efforts made to assess the influences of different design parameters on structural responses gravity cages. The present study first develops and validates an open-source numerical library under toolbox Code_Aster analyses Then, newly developed is employed conduct time-domain simulations investigate effects main cultivation volumes drag forces. In this paper, five circumferences...

A data-driven reduced-order model (ROM) based on long short-term memory neural network (LSTM-NN) for the prediction of flow past a circular cylinder undergoing two-degree-of-freedom vortex-induced vibration in upper transition Reynolds number regime with different reduced velocities is developed. The proper orthogonal decomposition (POD) technique utilized to project high-dimensional spatiotemporal data generated by solving two-dimensional (2D) unsteady Reynolds-averaged Navier–Stokes...