Abstract Flow through and around fishing net cages is an important issue in aquaculture. A three-dimensional multi-relaxation time (MRT) lattice Boltzmann model was used to simulate the flow field around a plane net in a constant current. The model was validated with experimental data. The results show that this numerical model is applicable to and reliable for the investigation of the flow field around a fishing net and can provide the detailed velocity distribution in the net aperture. Based on this model, a series of simulations were carried out to analyze the influences of the net solidity and the current velocity on hydrodynamic characteristics and flow-velocity attenuation. The results indicate that the flow-velocity attenuation is mainly related to the net solidity of the plane net, with a higher velocity drop response related to a higher net solidity. These results provide fundamental information for further studies on the flow field around the fishing net cage, which has potential application in analyzing the impacts of biofouling on fishing nets.

中文翻译：

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使用格子 Boltzmann 方法对渔机网周围流动的数值分析

摘要 渔网网箱内和周围的水流是水产养殖中的一个重要问题。三维多弛豫时间（MRT）晶格玻尔兹曼模型用于模拟恒流下平面网络周围的流场。该模型通过实验数据进行了验证。结果表明，该数值模型适用于渔网周围流场的研究，可靠，可以提供网孔内详细的速度分布。在此模型的基础上，进行了一系列模拟，分析了净固体度和流速对水动力特性和流速衰减的影响。结果表明，流速衰减主要与平面网的净实度有关，与更高的净实度相关的更高速度下降响应。这些结果为进一步研究渔网笼周围流场提供了基础信息，在分析生物污垢对渔网的影响方面具有潜在的应用价值。