波能装置库仑阻尼力的模拟方法研究  

Study on Simulation Method for Modelling the Coulomb Damping Force Acting on Wave Energy Converter

作　　者：王东旭 王宇瀚 董胜[3] Wang Dongxu;Wang Yuhan;Dong Sheng(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China;Institute of Water Resources and Ocean Engineering,Ningbo University,Ningbo 315211,China;College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211 [2]宁波大学水利与海洋工程研究院,浙江宁波315211 [3]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2024年第11期126-133,141,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(52171284)资助。

摘　　要：针对振荡浮子式波能装置动力输出系统库仑阻尼力的突变特性导致的计算不稳定问题,本文提出了一种模拟库仑阻尼力的方法。该方法通过以下步骤确保计算过程稳定:当波能装置速度接近0时,采用线性阻尼力代替库仑阻尼力;在每一迭代步内对施加在波能装置上的阻尼力进行松弛。然后,将这一方法植入开源计算流体力学程序DXFlow中,对一种新型波能装置-开孔防波堤集成系统进行数值模拟研究。研究结果表明,该方法可解决库仑阻尼力导致的计算不稳定问题,其中推荐使用的松弛因子范围为0.2~0.3。A novel method is proposed for modelling the Coulomb damping force(CDF)of power take-off(PTO)systems of oscillating wave energy converters(WECs),in which the instability problem caused by the sudden change characteristic of the CDF is resolvedusing the following steps:when the velocity of the WEC is close to 0,the CDF will be replaced using a linear PTO damping force;In each sub-iteration,an under-relaxation process is introduced to the PTO damping force to avoid its sudden change.Subsequently,the method is embedded in the open-source numerical model DXFlow,based on which numerical simulations are conducted to investigate the hydrodynamic performance of a perforated breakwater-WEC integrated system.The numerical result indicates that the present method is effective to resolve the instability problem caused by the CDF and the recommended underrelaxation factor is 0.2~0.3.

关 键 词：波能装置 动力输出系统 库仑阻尼力 计算不稳定 松弛 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]