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Damutu Bay in eastern Zhejiang, China has abundant tidal flat resources for years of silt deposition in the wide open seas, making it an ideal place for mudflat reclamation. In this study we set up a two-dimensional hydrodynamic and sediment transport model based on Mike 21 FM to investigate changes in suspended sediment concentration (SSC) after reclaiming to 1 m and 3 m depth contours in the seas...
This work controlled a robotic fish swimming alongside a wall. Research shows that fish swimming alongside a wall use lateral lines to obtain nearfield information. This concept is also applicable in man-made underwater vehicles such as robotic fish, which mimic the swimming action of a fish. Pressure sensors on the surface of a robotic fish measure hydrodynamic pressure variation. According to two-dimensional...
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...
Under the influence of the sea current, the hydrodynamic performance of the propeller varies with the changing of the incoming flow direction. Aiming to obtain the hydrodynamic performance accurately, the thrust and load characteristic of AUV propeller is investigated under the conditions that different angles incoming flow go through the plane of propeller. First, the visual-physical model is built...
This paper presents a towing tank-based experiment study on hydrodynamic coefficients on the underwater glider — Seagull. The present measurements were carried out at typical speeds of glider (0.2–0.5m/s) with varying angle of attack and slide. The measurements were used to study variation of drag, lift and pitching moment coefficients and angle of attack. The measurements have also been used to validate...
Sediment transport at the Yellow river delta is affected by many different factors, including tide, waves and river flows. With the change of river exit in 1996, a new delta is rapidly growing which leads to a new sediment transport regime. Most existing computer modelling work at the site is yet to take such changes into account. In addition, the wave action at the river mouth is often ignored in...
The aim of this study is to conduct a hydrodynamic analysis of a point absorber-type floating hemisphere with Power take-off(PTO) system for an optimum design of wave energy converter(WEC). In general, to predict the behavior of WEC, the equation of floating body motion can be solved in the frequency-domain analysis. A numerical model of PTO system is usually expressed as a linear damper-spring type...
Dynamic behaviors of AUV show a complex six-degrees of freedom (6-DOF) motion. They have great influence on the task precision and are influenced by uncertain marine environment parameters, in which influence of the lateral flow is one of the most significant. In this paper, dynamic behaviors of AUV in lateral flow are investigated using the CFD-based numerical method. Pressure distribution on the...
Conformation optimization and achieve resonation with wave are two key parts of designing pendulum wave energy converters. The object of this paper is to study hydrodynamics of a novel floating type pendulum wave energy converter and make optimization through full 3-D simulations. We will also conduct experiment in a wave tank to verify our simulations.
Tension leg platform (TLP) is a kind of offshore structures for oil or gas exploration in deep-water which has its special feature as partly compliant and partly rigid. Extended tension leg platform (ETLP) is the third generation of TLP which made an improvement on the basis of typical TLP structure. Extended structure is the most notable feature of ETLP which could increase the distance of groups...
This paper presents a new type of modular wave energy generation platform model which is based on wave energy conversion system and offshore platform. In this paper, a hydrodynamic analysis commercial software was used to analyze motion responses to different wave conditions at the joints of each two unit modules of this platform in irregular waves. This wave energy generation device mainly has two...
Aiming at automatic monitoring and working in shoal environment, we conceive a shoal crab robot equipped with paddle actuators mimicking the locomotion of Portunus crab. The synergetic motion of two paddles on the robot is investigated numerically and experimentally for the generation of subsea swimming gait, which provides a new way of thinking and choice for further research on the bionics multi-legged...
Seagull is a small fully functional underwater glider designed for oceanographic research with 1 knot operating speed and six months duration. In this paper, we present the design of this glider and analyze its performance. The Seagull glider uses a piston-based buoyancy engine system with an inexpensive gear pump as the main system actuator. The Seagull's emergency release system is characterized...
Marine oil spill is an inevitable and undesirable consequence of producing and transporting petroleum, as well as the associated refined products. To reduce oil spill pollution, China has made many great achievements to develop adequate pollution contingency plans for several years. During the oil spill response, it is important to understand the behavior and fate of spilled oil in the forecasting...
The heaving buoy wave power device only uses the energy of one-directional movement to generate electric power, neglecting the energy of other degrees of freedom. Based on this, an innovative buoy wave power device considering multi-freedom oscillation is projected. It has three translational degrees of freedom that are heave, sway and surge. In order to provide a reference for the device design,...
As small waterplane area twin hull (SWATH) has excellent seakeeping performance and low wave resistance, this structure has been applied to unmanned surface vehicle (USV). However, with the increase of speed, fluid resistances will increase exponentially because of its large wet surface. A way to improve this situation is to reduce the depth of draft at high speed, so that all or a part of the volume...
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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