小水线面三体船耐波性数值模拟

Numerical simulation of seakeeping performance of a trimaran small waterplane area center hull

    摘要
  • 摘要:
      目的  小水线面三体船与普通三体船相比具有较大的潜体并极大地减少了水线面面积，因此普通三体船的耐波性规律不完全适用于小水线面三体船，小水线面三体船的耐波性还有待研究。
      方法  因模型试验具有周期长、成本高、环境要求苛刻的特点，难以对所有方案进行试验与分析，故采用STAR-CCM+平台模拟船体周围的黏性流场。首先，考虑到网格设置、流场模型选择的影响，验证采用STAR-CCM+平台进行耐波性计算的可行性与可靠性；然后，研究系列弗劳德数Fr下不同侧体位置时小水线面三体船耐波性的变化规律。
      结果  结果显示，Fr=0.234（低速）时，小水线面三体船的耐波性优于普通三体船，Fr=0.494~0.797（中、高速）时情况较复杂；小水线面三体船侧体靠近船艏时耐波性更优。
      结论  研究结果可为小水线面三体船的设计提供一定的借鉴。

     

    Abstract:
      Objectives  Compared with trimarans, the trimaran small waterplane area center hull (TriSWACH)has a larger underwater ship and the waterline surface is greatly reduced, therefore, the seakeeping law of ordinary trimaran is not completely applicable to TriSWACH. The seakeeping performance of the TriSWACH is still to be researched.
      Methods  As model tests are time-consuming, expensive, and demanding in terms of the environment required, it is difficult to test and analyze all schemes. Therefore, STAR-CCM + is used to simulate the viscous flow around the hull. Firstly, considering the influence of grid setting and flow field model selection, we verified the feasibility and reliability of STAR-CCM + for calculating the seakeeping performance of trimarans. Then, the variation law of the TriSWACH's seakeeping performance is analyzed with different side-hulls.
      Results  The results show that the seakeeping performance of the TriSWACH is better than that of a trimaran when Fr=0.234 (low speed). The simulation of Fr=0.494-0.701(middle and high speed) is complicated. The seakeeping performance of the TriSWACH is better when the side-hull is placed closer to the ship bow.
      Conclusions  The results can serve as a reference for TriSWACH design.

     

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