SA与MILES模型在SFS2舰船空气流场中的模拟应用

Simulation Application of S-A and MILES Model in SFS2 Ship Airwake

为了研究SFS2的舰船空气流场特性,分别利用N-S方程和MILES方法对SFS2空气流场进行数值模拟,其中RANS方程的求解中应用了SA湍流模型,并与风洞试验结果进行对比。计算结果表明,SA和MILES模型均能得到与风洞试验变化规律相同的时均流场结果,但MILES对尾流场的预测精度相对更高,且能得到空气流场的瞬时特性,用于更精确地分析舰船空气流场。研究表明,当改变两种计算模型来流速度时,流动结构基本一致,船体表面压力系数分布几乎一致。

In order to study the ship airwake characteristics of SFS2, both N-S equation and MILES model are used to simulate the SFS2 ship airwake, and the SA turbulence model is applied to solve the RANS equation. The results are compared with the experimental data. The calculation results show that both the SA and the MILES model can get the same tendency with the wind tunnel test results, but the prediction accuracy of MILES for flow is relatively higher, and can get the instaneous characteristics of ship airwake. It can be used to do more accurate analysis of ship air flow. The results show that the flow structure is basically the same when the two computational models are changed. The pressure coefficient distribution of the hull surface is almost the same.