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Effects of Inclination Angles on the Hydrodynamics of Knotless Net Panels in Currents

文献类型： 外文期刊

作者： Wang, Gang 1 ; Cui, Yong 1 ; Guan, Changtao 1 ; Gong, Pihai 1 ; Wan, Rong 2 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

2.Shanghai Ocean Univ, Coll Marine Sci, Natl Engn Res Ctr Ocean Fisheries, Key Lab Sustainable Exploitat Ocean Fisheries Reso, Shanghai 201306, Peoples R China

关键词： inclination angles; hydrodynamics; net panel; CFD; REEF3D

期刊名称：JOURNAL OF MARINE SCIENCE AND ENGINEERING （ 影响因子：2.9； 五年影响因子：2.9 ）

ISSN：

年卷期： 2023 年 11 卷 6 期

页码：

收录情况： SCI

摘要： Knotless nets have been extensively used in sea cages and offshore fish farms; the explicit illustrations of local flow patterns and subjected hydrodynamic loads have practical implications for the safe operations of aquaculture pens in open oceans. However, the effects of inclination angles of knotless nets on local flow patterns have not yet been fully discussed. In this paper, the effects of inclination angles on local time-averaged and instantaneous flow fields, velocity reductions and force coefficients are investigated using a k-? shear stress transport-improved delayed detached eddy simulation (SST-IDDES) high-fidelity turbulence model. It is demonstrated that the inclination angles have dominant effects on the time-averaged velocity magnitudes around the net meshes. Secondly, the considerable flow interactions amongst the transverse and longitudinal net meshes, as well as cross-flow effects, are observed but weakened with the inclination angles. Thirdly, the profiles of velocity decelerations behind the net panels for 0 & LCIRC;-45 & LCIRC; are not as trivial as those for 45 & LCIRC;-90 & LCIRC;. The associations between the embedded mechanism of subjected loads and pressure fields are established to analyse the current loads on nets in small inclination angles. The inclination angles are finally elaborated into the area-averaged velocity reduction and screen force models, then the improved characteristics are validated against the experimental data.

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