Shape optimization and hydrodynamic simulation of a Magnus anti-rolling device based on fully parametric modeling
Shape optimization and hydrodynamic simulation of a Magnus anti-rolling device based on fully parametric modeling
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DOI：
10.1063/5.0152179
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发表时间：
2023-05
影响因子：
4.6
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中科院分区：
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船舶减摇装置是现代船舶的重要组成部分。基于马格努斯效应的船舶减摇装置的核心部件是一个旋转圆柱，以下简称为马格努斯圆柱。本文对马格努斯圆柱进行了全参数三维建模，并使用索博尔设计优化方法降低了设计空间维度，同时仍能提供准确可靠的结果。索博尔方法生成的准随机序列在搜索空间中分布更均匀，能够更有效地覆盖整个解空间。结合计算流体动力学方法对马格努斯圆柱进行了形状优化研究，以找到具有优异水动力性能的马格努斯圆柱几何形状。关键设计参数包括圆柱端部直径和圆柱长度。比较了优化前后马格努斯圆柱的水动力和流场特性。结果表明，在设计空间内，马格努斯圆柱的升力和阻力可能存在多个局部最优值，以增加升力并降低阻力。马格努斯效应主要影响马格努斯圆柱表面涡旋脱落分离点的位置，并使尾流偏向一侧。对于优化后的马格努斯圆柱，流场中的压力和速度分布有显著差异。这项研究为改进马格努斯减摇装置的实际应用奠定了基础。
Ship anti-rolling devices are an essential component of modern vessels. The core component of the Magnus effect-based ship anti-rolling device is a rotating cylinder, hereinafter referred to as the Magnus cylinders. In this paper, fully parametric three-dimensional modeling of Magnus cylinders was performed, and the design space dimension was reduced using the Sobol design optimization method while still providing accurate and reliable results. The Sobol method generates quasi-random sequences that are more uniformly spaced in the search space and can more efficiently cover the entire solution space. The shape optimization study of the Magnus cylinder was carried out in conjunction with the computational fluid dynamics method to find the geometry of the Magnus cylinder with excellent hydrodynamic performance. Critical design parameters include the diameters of the cylinder ends and the length of the cylinder. The hydrodynamic and flow field characteristics of Magnus cylinders before and after the optimization were compared. The results show that there can be multiple local optimal values for lift and drag of Magnus cylinders within the design space to increase the lift and decrease the drag. The Magnus effect primarily influences the position of the vortex-shedding separation point at the surface of Magnus cylinders and deflects the wake to one side. For the optimized Magnus cylinder, the distribution of pressure and velocity in the flow field is significantly different. This research forms the basis for improving the practical application of Magnus anti-rolling devices.