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为提高舰尾紊流自由大气紊流分量仿真的可信度,提出了一种紊流数值模拟的新方法.首先,使用带有修正系数的Euler前向差分格式表示各个方向的紊流序列,同时结合智能算法的思想,把紊流相关性检验中的均方差误差和相关函数误差作为待优化目标函数,将修正系数的选择看成一个多目标优化问题,并采用改进的多目标遗传算法进行求解.最后,通过仿真算例验证了本文方法的正确性与合理性,计算结果表明该方法可以根据不同的采样步长灵活地生成所需紊流.尤其在小步长情况下,亦可得到很好符合理论值的紊流序列,可以满足虚拟飞行实验的要求.
A new method of numerical simulation of turbulence is proposed to improve the confidence of free-air turbulence component simulation of ship-borne turbulence.Firstly, the Euler forward difference scheme with correction coefficients is used to represent the turbulence sequences in all directions, At the same time, combined with the idea of intelligent algorithm, the mean squared error and correlation function error in the turbulence correlation test are taken as the objective function to be optimized, the choice of the correction coefficient is considered as a multi-objective optimization problem, and the improved multi-objective genetic algorithm Finally, the correctness and rationality of the method in this paper are verified by simulation examples, and the calculation results show that the method can generate the required turbulence flexibly according to different sampling steps, especially in the case of small steps The turbulence sequence, which is well consistent with the theoretical value, can meet the requirements of the virtual flight experiment.