Research On Wave Cancellation Performance Of Flexible Breakwater Based On Savonius Blade

The flexible breakwater is a more practical marine infrastructure.The flexible breakwater studied in this paper is mainly used to resist waves and protect the large fence culture,which has profound significance for the construction of smart marine pastures and deep-sea breeding.On the basis of the original wave-breaking function,the flexible breakwater is equipped with Savonius-type blades,which enhances the wave-removing performance and adds the energy-harvesting function.Compared with the traditional bottom-mounted breakwater,it is also simple to manufacture,the cost will not increase with the increase of water depth,and has the characteristics of easy installation and easy migration,convenient maintenance and multiple use,will not cause pollution to the environment and Affect the ecological environment.In this paper,we study the structure of flexible breakwaters and the energy absorption and wave elimination under the action of waves in response to the requirements of large fence culture.The main research points are as follows:1.Using STAR-CCM+software,according to the principle of boundary wave method and damping wave elimination,establish a viscous 3D numerical flume of flexible breakwater,using turbulence model,overlapping grid technology,six-degree-of-freedom motion model,VOF free liquid surface capture The calculation of gas-liquid two-phase flow in the calculation domain provides a new research idea for the research of the flexible breakwater structure based on Savonius blades.2.According to the numerical simulation of STAR-CCM+,design and manufacture a flexible breakwater based on Savonius blades.The blades are suspended by stainless steel iron chains under the double-float floating body,which reduces the vibration of the flexible breakwater under the action of waves.The stability of the flexible breakwater has also been improved to prevent rollover due to the strangulation of the structure.Savonius-type blades use HDPE material with a density slightly lower than water,which reduces the moment of inertia of Savonius-type blades in water.3.A scheme of flexible breakwaters based on Savonius blades is proposed.Under the comparison of numerical simulation and experiment,a blade arrangement suitable for Savonius blades for energy harvesting and overall flexible breakwaters for wave elimination is selected.The results show that the flexible breakwaters with parallel blades have better wave-reducing performance under the condition of self-powered energy harvesting.The main reason is that the arrangement of the blades changes the flow structure of the water body better.To achieve the purpose of energy consumption and wave elimination.4.The structural parameters of the flexible breakwater of Savonius blades were optimized,and the wave-removing performance of the flexible breakwater under energy harvesting was studied from three aspects:relative spacing,relative depth,and steepness.The results show that when the wave period is close to the blade rotation period,it has a good energy harvesting effect.As for the study of the transmission coefficient of the flexible breakwater by the wave period,it is known from physical experiments that with the increase of the steepness of the wave,the energy harvesting performance of the Savonius blade is improved.the trend of.Figure[67]table[7]reference[74]...