Wave flume

About: Wave flume is a research topic. Over the lifetime, 1627 publications have been published within this topic receiving 23335 citations.

Numerical wave flume for the study of scour protection around offshore monopile foundations under currents loading

Abstract: Introduction Offshore Wind Farms are a growing technology in the energy generation market. On one hand, the competitiveness of the energy market, driven by cheap hydrocarbons, is asking from offshore wind turbines for better energetic and economic yields. On the other, climate change, driven by polluting hydrocarbons, is harshening environmental conditions, thus increasing the cost and risks of such turbines. In this context, a better knowledge of the behaviour of offshore wind turbines foundations, can reduce the installations cost, increase/extend its lifetime and prevent failure under extreme weather events. Scour around monopiles has been widely studied, while, scour protection made of stones around monopiles has not. De Vos et al. [1] distinguish three main failure modes for scour protection:  Disintegration  Edge scour  Sinking. Sinking has been studied experimentally in Nielsen et al. [2] for currents, waves and breaking waves. The latter paper hypothesizes that the main reason for the sinking of the scour protection in the case of Horns Rev 1 wind farm, is the pick-up of seabed sediment by the horseshoe vortex induced by currents penetrating in the scour protection. Following this hypothesis, a numerical model based on the Flow 3D software [3]for the study of current’s action on the scour protection was developed. The paper concludes that a porous medium approach of scour protection can be used to determine the bed shear stresses underneath the scour protection, although calibration is needed.

Modeling Nonlinear Wave Based on SPH Method

Abstract: A two-dimensional numerical wave flume is developed using Smoothed Particle Hydrodynamics (SPH) method. Solitary and irregular waves are modeled in the present numerical flume. Comparisons of modeling results with analytical solutions and experimental results show satisfactory agreement. The present numerical wave flume can also exhibit the decadent characteristics with wave propagations, agreeing well with the laboratory investigations.

Numerical Simulation of an Oscillating Water Column Problem for Turbine Performance

Abstract: Air turbines are commonly used in Oscillating Water Column (OWC) devices for wave energy conversion. This chapter presents a proposed methodology to simulate the performance of an OWC turbine through the implementation of an Actuator Disk Model (ADM) in Fluent\(^{\circledR }\). A set of different regular wave tests are developed in a 2D numerical wave flume. The model is tested using the information analysed from experimental tests on a Wells type turbine, carried out in wind tunnel. Linear response is achieved in terms of pressure drop and air flow in all cases, proving effectively the actuator disk model applicability to OWC devices.

An investigation into the motion and stability behaviour of a RO-RO vessel

Abstract: Studies on motion response of a vessel is of great interest to researchers, since a long time. But intensive researches on stability of vessel during motion under dynamic conditions are few. A numerical model of vessel is developed and responses are analyzed in head, beam and quartering sea conditions. Variation of response amplitude operator (RAO) of vessel based on Strip Theory for different wave heights is plotted. Validation of results was done experimentally and numerical results was considered to obtain effect of damping on vessel stability. A scale model ratio of 1:125 was used which is suitable for dimensions of wave flume at National Institute of Technology Calicut. Stability chart are developed based on Mathieu\'s equation of stability. Ince-Strutt chart developed can help to capture variations of stability with damping.