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舰面流场对舰载直升机的起降安全性有显著影响,针对传统CFD方法在复杂模型仿真计算的不足,提出了以格子-波尔兹曼方法应用于舰面流场研究领域的课题。从基本原理和特性上介绍了格子-波尔兹曼方法,以美国船坞运输舰LPD-17为算例进行了计算仿真,分析了舰面流场的主要特征,通过对比以前的研究得出了相关结论。数值模拟表明,舰尾附近存在复杂的涡流影响,会给飞行器的起降造成困难。同时,基于格子-波尔兹曼方法的求解程序,具有较好的并行效率和计算精度,省去了复杂网格生成中人工作业,提高前处理效率,减少了网格处理中的不确定性,提高了复杂流场的分析效率和结果的可信度。
Ship-surface flow field has a significant impact on the take-off and landing safety of ship-borne helicopters. In view of the shortcomings of traditional CFD method in complex model simulation, this paper puts forward the issue of applying grid-Boltzmann method to the field of ship surface flow field. The lattice-Boltzmann method is introduced from the basic principle and characteristics. The calculation and simulation of the ship docker LPD-17 is carried out. The main characteristics of the flow field of the ship are analyzed. The correlation is obtained by comparing the previous studies in conclusion. Numerical simulation shows that there is a complex eddy current near the stern, which will cause difficulties for the aircraft to take off and land. At the same time, the solving procedure based on Lattice-Boltzmann method has better parallel efficiency and calculation accuracy, eliminating the need of manual work in complex grid generation, improving the pre-processing efficiency and reducing the uncertainty in the grid processing This improves the analytical efficiency of complex flow fields and the confidence of results.