基于多孔介质模型的养殖装备网衣水动力特性研究

Research on hydrodynamic characteristics of aquaculture equipment netting based on porous media model

受近海养殖空间限制及环境污染问题的影响,近年来,海上养殖业逐渐向深远海发展。然而,深远海的气候更为恶劣复杂,为保障养殖装备的结构安全,需对其进行水动力特性研究。以养殖装备的网衣作为研究对象,使用多孔介质理论对网衣结构进行建模,采用开源CFD软件OpenFOAM进行数值模拟研究,探究了网衣与规则波和聚焦波的相互作用。结果表明,在规则波输入下,随着密实度和特征速度的增大,网衣阻力逐渐增加,随着特征长度的增加,网后波浪的透射系数逐渐增加;在聚焦波输入下,波浪的频域分布没有显著变化,随着网目尺寸的增大,网衣阻力逐渐增加。最后,综合数值计算的结果,将雷诺数和KC数作为输出参数,建立了极端波浪下多孔介质网衣阻力的预报模型。

Affected by the limitation of offshore aquaculture space and environmental pollution problems,the marine aquaculture industry has gradually developed into the deep sea.However,the climate in the deep sea is more severe and complex.In order to ensure the structural safety of aquaculture equipment,it is necessary to conduct research on its hydrodynamic characteristics.As an important aquaculture equipment,the fishing net is taken as the research object.The porous medium theory was used to model the structure of the net,the open source CFD software OpenFOAM was used to conduct numerical simulation research,and the interaction of the net with regular waves and focused waves was explored.The results show that in the case of regular waves as input,with the increase of solidity ratio of the fishing net and the characteristic velocity,the resistance of the net increases gradually,and with the increase of the characteristic length,the transmission coefficient of the wave behind the net location increases gradually;in the case of focused waves as input,the frequency domain distribution did not change significantly,and with the increase of mesh size,the mesh resistance gradually increased.Finally,based on the results of numerical results,the Reynolds number and KC number are used as output parameters to establish a prediction model for the mesh resistance of porous media under extreme waves.