水产学报2024，Vol.48Issue(12)：106-119,14.DOI:10.11964/jfc.20240714617
基于离散延迟涡方法的PET网片水动力特性
Hydrodynamics of PET net panels using the Improved Delayed Detached Eddy Simulation
摘要
Abstract
This study employs the Improved Delayed Detached Eddy Simulation(IDDES)method to explore the flow field distributions and hydrodynamic coefficients to further enhance the understanding of the hydrodynamic characteristics of polyethylene terephthalate(PET)nets commonly used in offshore aquaculture facilities.The study examined the effects of inflow velocity,angle of attack,and net solidity on the hydrodynamic behavior of the net panels.Capitalized on a typical case of flowing past a circular cylinder,the accuracies of the turbulence model and the solver were successfully substantiated.The results presented that the velocity fields and hydrodynamic coefficients of the 19 net-mesh panels were close to the full-scale nets.The drag coefficients gradually declined as the increase of inflow velocities.The local flow acceleration effected on both spanwise directions of twines dimin-ish,while the downstream wake gets fully developed.Furthermore,the drag coefficients of nets present a gradual increasing tendency with net solidities,the local flow acceleration effected on both spanwise directions of twines,and the wake interactions were enhanced.The downstream streamlines converged to form a considerable region with low velocities for the case of the solidity 0.230.The drag coefficients continuously increased as the panels became more perpendicular to the flow direction,while the lift coefficients were inclined to rise initially and then decreased.The more considerable velocity reductions in addition to low flow interactions among twines were also observed.The effects of local interactions of flow fields among twines,along with the flow acceleration on both spanwise directions of twines,were the most dominant especially in the case of angle of attack 90°.This study demonstrated that both solidity and angle of attack significantly influenced the flow field distribution and hydro-dynamic coefficients of PET nets.This numerical study has clarified the velocity fields and hydrodynamic coeffi-cients around PET nets,providing the solid foundation for further analysis of the flow exchange across aquacul-ture structures.关键词
PET网衣/改进的延迟分离涡模型(IDDES)/流场分布/尾流衰减/水动力系数Key words
PET nets/Improved Delayed Detached Eddy Simulation(IDDES)/flow fields/wake effects/hydro-dynamic coefficients分类
农业科技引用本文复制引用
王志,王刚,焦兆齐,冯德军,曲晓玉,桂福坤..基于离散延迟涡方法的PET网片水动力特性[J].水产学报,2024,48(12):106-119,14.基金项目
国家自然科学基金(32303072,32002441) （32303072,32002441）
青岛市自然科学基金(3-21-45-zyyd-jch) （3-21-45-zyyd-jch）
中国博士后科学基金(2022M723503) （2022M723503）
第九届青托工程项目(2023QNRC001) （2023QNRC001）
现代农业产业技术体系建设专项(CARS-47-22) （CARS-47-22）
浙江省"尖兵""领雁"研发攻关计划项目(2023C02029) National Natural Science Foundation of China(32303072,32002441) （2023C02029）
Qingdao Natural Sci-ence Foundation(3-21-45-zyyd-jch) （3-21-45-zyyd-jch）
China Postdoctoral Science Foundation(2022M723503) （2022M723503）
Young Elite Scient-ists Sponsorship Program by CAST(2023QNRC001) （2023QNRC001）
China Agriculture Research System(CARS-47-22) （CARS-47-22）
"Pion-eer"and"Leading Goose"R&D Program of Zhejiang(2023C02029) （2023C02029）
