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In response to the growing energy needs and the global trend on renewable energy development, we are also dedicated to harvesting marine energy from Kuroshio Current, which flows through the eastern waters of Taiwan. However, due to the lack of the offshore technological experience of constructing and deploying floating turbines with permanent mooring system in deep water, the deployment and recovery...
Propeller ventilation is one of the main reasons for the widespread mechanical failures of thrusters, with costly repairs and increased vessel down-time. Most of existing ventilation detection methods have been designed based on the dynamics/control modelling of water and the propeller, and they generally require information or accurate estimates of vessel specific parameters. The main challenges...
The effect of stanchion and reverse flow on turbine power performance is studied based on Computational Fluid Dynamics (CFD). The turbine in this paper is developed by National Ocean Technology Center (NOTC), the experiment study has been carried out in year 2014. The simulation model is validated based on experimental results. The CFD model can simulate the marine current conditions up to an acceptable...
A hybrid underwater glider(HDUG) is developed based on a folding propeller. The blades of the propeller can fold and unfold according to the motor work or not. When it stop spinning, the blades will come to a rest position. The hydrodynamic performance will vary with the position of the blades, thus the transit efficiency of the HDUG will also vary. So there must be an optimal transit efficiency for...
Tidal stream offers divinable and regular electricity generation at higher power densities than other renewable energy sources. With an increasing concern over the potential of harnessing ocean energy for electricity generation by marine current turbine (MCT) and its impact on water environment, the exploration and assessment works are required. Based on a three-dimensional ocean model with a developed...
From field data of the Kuroshio Current near Miyake Island, the shear flow profile is discovered. To study its hydrodynamic effect, a nearly linear shear flow was obtained in a circulating tank by inserting grids of parallel rods with varying spacing. The results of the circulating tank test on an 880mm diameter model of a marine current turbine in the shear flow generated are presented. The experimental...
Measurements of wind direction are sought after by a multitude of professionals in many different domains. Whether to recalibrate meteorological models or simply for leisure activities, the demand for accurate and responsive wind measurements is widespread. This study was motivated by the need to improve the responsiveness of direction measurements on yachts. Here we argue that the ideal form factor...
In this paper, meshing impact on numerical simulation of marine systems is investigated. Different mesh topologies, meshing spacing, meshing refining area are discussed. Different shaped bodies such as ball, AUV and complicated motion such as propeller rotating are simulated with compared meshes in the paper. And its converging time, solution accuracy, and local domain flow characters are compared...
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