兼具波能转换与减振作用的OWSC-VLFS集成系统的水动力性能研究  

Hydrodynamic performance study of OWSC-VLFS integrated system with wave energy conversion and reduction of the hydroelastic response

作　　者：席晨 程勇[1] XI Chen;CHENG Yong(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003

出　　处：《船舶力学》2023年第9期1337-1345,共9页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(51609109)。

摘　　要：摆式波能装置与超大型浮体集成系统在间隙流体共振作用下其浮式弹性板的水弹性响应和波能装置的水动力性能属于非线性范畴,尤其当非线性多体相互作用时,这种非线性行为更加复杂,因此采用完全非线性分析技术是唯一可获得浮板精确水弹性响应以及波能装置俘获效率的方法。本文利用计算流体软件耦合有限元方法建立模拟摆式波能装置与超大型浮体相互作用的完全非线性三维时域数值水槽模型;将弹性板模型加入到流固耦合交界面,对流体结构相互作用进行建模并对超大型浮体进行离散,再利用数据交互实现耦合计算;采用有限体积法对Navier-Stokes控制方程进行空间离散,使用流体体积法追踪流体与空气两相之间的自由界面变化。结果表明:浮板中线各点处的垂向位移随摆板水下深度的增加而减小,而摆板俘获效率随其水下深度的增加而增大;波幅的增加会加剧波浪的非线性作用,当波幅增加时,集成系统中浮板的水弹性响应明显减小,摆板的俘获效率逐渐降低。Hydroelastic analysis of OWSC-VLFS integrated system interaction with a floating elastic plate is complex,especially in nonlinear multi-body interaction.The fully-nonlinear analysis techniques are widely recognized as a unique approach to predict the accurate hydroelastic responses of VLFS and hydrodynamic performance of WEC.A three-dimensional time domain fully-nonlinear numerical tank using CFD-FEM coupling method was developed to solve such a problem in this paper.An elastic plate model was introduced to determine the fluid pressure imposed on the fluid-structure interface.The fluid structure interaction(FSI)was developed,the VLFS was discretized,and the coupling calculation was achieved by data interaction.Meanwhile,the finite volume method was used to discretize the Navier-Stokes equations and the volume of fluid method was applied to update the instantaneous free and plate surface.The results shows that the hydro-elastic response amplitude decreases with the increase of the underwater length of the flap,but the capture ef-ficiency of the flap rises with the increase of its underwater length.Increase of the wave amplitude will ampli-fy the nonlinear effect.When the wave amplitude increases,the hydroelastic response of VLFS in the integrat-ed system decreases obviously,and the capture efficiency of the flap decreases gradually.

关 键 词：波浪能 摆式波能装置 时域完全非线性 超大型浮体 水弹性响应 

分 类 号：TV131.2[水利工程—水力学及河流动力学]