基于参数化建模和CFD数值模拟的船舶球鼻艏优化设计

Optimization of the lines of bulbous bow of a hull based on parametric modeling and CFD calculation

针对传统船舶球鼻艏形状设计存在的问题,对基于NURBS方法的船体完全参数化建模和基于Rankine源的面元法的船舶阻力数值计算进行了研究,对一类组合型优化策略结合设计变量、约束条件和优化目标进行了分析,通过建立一类自动优化平台对船舶球鼻艏型线进行了优化设计。通过优化平台对船体球鼻艏各项参数进行了自动优化调整直至满足减小船舶兴波阻力的优化目标。应用所构建的优化框架,以兴波阻力最小化为目标对某一滚装船球鼻艏型线进行了优化设计。研究结果表明,型线优化后的船体兴波阻力得到下降,船艏周围兴波得到了改善,验证了所提出型线优化设计方案的有效性。

Aiming at the problem of the traditional design of the bulbous bow of a hull,complete parameter modeling of the hull by using NURBS and the calculation of the hull resistance based on Rankine source panel method was investigated. A hybrid optimization strategy in combination of the design variables,constraints and optimization goal were analyzed. An automatic optimization platform at the ship design stage was constructed to optimize the lines of bulbous bow of a hull. The parameters of the lines of bulbous bow of a hull were automatically optimized and adjusted to meet the aim to reduce the wave-making resistance by using the automatic optimization platform. A lines of bulbous bow of a hull of a ro-ro ship was optimized by using the optimization method proposed,with the objective to minimize the wave-making resistance. The results indicate that wave-making resistance reduces obviously and the wave-shape of near bow becomes gentle after the lines of bulbous bow of a hull are optimized,which demonstrates the validity of the proposed optimization design strategy.