基于CFD方法的远洋鱿鱼钓船舭龙骨优化设计

CFD-based optimization design of bilge keel for ocean-going squid fishing boat

  • 摘要:
    目的 旨在对66 m远洋鱿鱼钓船的原舭龙骨进行设计,优选出能够在提高渔船耐波性的基础上保证其快速性的舭龙骨设计方案。
    方法 通过对舭龙骨的长度和宽度进行变换,设计6种不同形式尺寸的舭龙骨;基于计算流体力学(CFD)方法,采用流体体积法(VOF)模型并结合重叠网格技术对6种不同舭龙骨远洋鱿鱼钓船的自由横摇衰减进行数值模拟,获取可靠的阻力数值以及自由横摇衰减时历曲线,同时研究舭龙骨长度、宽度、长宽比对横摇运动的影响;通过横摇运动对比,选择减摇效果较好的3种优化方案进行阻力数值模拟,以研究钓船优化的设计方案。
    结果 模拟结果显示,Model 3相对于Model 0在Fr = 0时其横摇阻尼增加了23.37%,在Fr = 0.168时增加了25.31%,在Fr = 0.230时增加了85.80%,减摇效果较好;在选取的3种减摇效果较好的舭龙骨中,Model 3相对于Model 0其阻力增加值最小,可以在获得良好耐波性的基础上满足渔船快速性的要求。
    结论 所做研究可为提高远洋鱿鱼钓船的耐波性以及舭龙骨的选取提供有益的参考。

     

    Abstract:
    Objectives This study seeks to design an original bilge keel for a 66 m ocean-going squid fishing boat and optimize the design scheme to improve its wave resistance and ensure the boat's rapidity.
    Methods By converting the length and width of a bilge keel, five more bilge keels of different sizes are designed. Based on the computational fluid dynamics (CFD) method, the volume of fluid (VOF) model and overlap grid technology are used to numerically simulate the free roll attenuation of these six different bilge keels and obtain reliable resistance values and free roll attenuation time curves. The effects of bilge keel length, width and length-to-width ratio on the roll motion are studied. Through a comparison of roll motion, three optimization schemes with better roll reduction effects are selected, and the numerical simulation of resistance is carried out to study the optimization design schemes.
    Results As the simulation results show, compared with Model 0, the roll damping of Model 3 increases by 23.37% when Fr = 0, increases by 25.31% when Fr = 0.168 and increases by 85.80% when Fr = 0.230, providing a superior roll damping effect. Moreover, among the three bilge keels with good roll damping effects, compared with Model 0, Model 3 has the smallest resistance increase value, which can meet the requirements for the boat's rapidity on the basis of obtaining good wave resistance.
    Conclusions The results of this study can provide useful references for improving the wave resistance and selection of bilge keels for ocean-going squid fishing boats.

     

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