College of Shipbuilding Engineering, Harbin Engineering University, Harbin, China.
Department of Mechanical Engineering, University of New Hampshire, Durham, NH, USA.
Sci Prog. 2020 Jan-Mar;103(1):36850419901235. doi: 10.1177/0036850419901235.
Hydrodynamic effects of mussel farms have attracted increased research attentions in recent years. The understanding of the hydrodynamic impacts is essential for predicting the sustainability of mussel farms. A large mussel farm includes thousands of mussel droppers, and the combined drag on the mussel droppers is sufficient to possibly affect the longevity of the entire long-lines. This article intends to study the drag and wake of an individual long-line mussel dropper using computational fluid dynamics approaches. Two equivalent rough cylinders, namely, Curved-Model and Sharp-Model, have been utilized to simulate the mussel dropper, and each rough cylinder is assigned with surface roughness. The porosity is not considered in this article due to its complexity from inhalant and exhalant of mussels. Two-dimensional laminar simulations are conducted at Reynolds number from 10 to 200, and three-dimensional large eddy simulations are conducted at subcritical Reynolds number ranging from 3900 to . The results show that larger drag coefficients and Strouhal numbers are attributed to surface roughness and sharp crowns on the rough cylinder. The obtained drag coefficient ranges from 1.1 to 1.2 with respect to the diameter of the mussel dropper and the peak value of the tidal velocities. Wakes behind rough cylinders fluctuate more actively compared to those of smooth cylinders. This research work provides new insight for further investigations on hydrodynamic interactions between fluid and mussel droppers.
近年来，贻贝养殖场的水动力效应引起了越来越多的研究关注。了解水动力的影响对于预测贻贝养殖场的可持续性至关重要。一个大型贻贝养殖场包括数千个贻贝吊笼，贻贝吊笼的总阻力足以影响整个养殖线的寿命。本文旨在利用计算流体动力学方法研究单个贻贝吊笼的阻力和尾流。使用了两个等效的粗糙圆柱体，即弯曲模型和锐边模型来模拟贻贝吊笼，每个粗糙圆柱体都被赋予了表面粗糙度。由于贻贝的吸入和呼出，本文不考虑孔隙率，因为它很复杂。在雷诺数为 10 到 200 之间进行二维层流模拟，在亚临界雷诺数范围内从 3900 到 进行三维大涡模拟。结果表明，表面粗糙度和粗糙圆柱体的锐边会导致更大的阻力系数和斯特劳哈尔数。所得到的阻力系数范围为 1.1 到 1.2，与贻贝吊笼的直径和潮汐速度的峰值有关。与光滑圆柱体相比，粗糙圆柱体后面的尾流波动更为活跃。这项研究工作为进一步研究流体和贻贝吊笼之间的水动力相互作用提供了新的见解。
