航行姿态对半滑行三体船型静水阻力影响的数值研究

A numerical investigation of sinkage and trim effects on the resistance of trimaran hull form in calm water

    摘要
  • 摘要:
      目的  半滑行船型（弗劳德数Fr >0.4）的航行姿态（升沉和纵倾）对船舶阻力性能影响显著，重点探讨半滑行状态下航行姿态对三体船型阻力成分（摩擦阻力和压差阻力）的影响规律。
      方法  采用k-ε湍流模型，使用重叠网格技术，对三体船型的静水阻力问题进行CFD数值模拟研究。计算三体船的2种状态（自由航行状态和固定航行姿态的状态），比较上述状态下的阻力成分，分析航行姿态对阻力成分的影响规律。
      结果  计算结果表明，在半滑行状态下，由航行姿态引起的总阻力变化超过20%；航行姿态变化对压差阻力影响显著，约高达50%，而对摩擦阻力的影响则相对较小，不到8.5%；由航行姿态引起的阻力增加，90%以上来自压差阻力的变化。
      结论  准确预报航行姿态及由此产生的压差阻力变化对半滑行三体船型非常重要。

     

    Abstract:
      Objectives  The motion attitude (sinkage and trim) of a semi-planing ship (at Froude numberFr > 0.4) have significant effects on its resistance performance during voyage. The sinkage and trim effects on the resistance components (frictional resistance and pressure resistance) is discussed.
      Methods  A CFD study is carried out on the resistance performance of trimaran in calm water, and the k-ε turbulent model and overlapping grid are adopted. The free model and constrained model are computed. The computed results are compared to analyze the effects of sinkage and trim on the resistance components.
      Results  The results show that the change of total resistance caused by sinkage and trim is more than 20% in semi-planing conditions. The sinkage and trim have a significant effect on the pressure resistance, up to nearly 50%; and a relatively small effect on frictional resistance, less than 8.5%. More than 90% of the resistance increase caused by motion attitude comes from the change of pressure resistance.
      Conclusions  Predicting the motion attitudes and resulting pressure resistance changes accurately is extremely important for semi-planing trimaran.

     

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