Numerical simulations of underwater vehicle wake flow field and propeller excitation force were performed to evaluate the performance of the k-ω SST RANS and k-ω IDDES turbulence models. First, the nominal wake of the SUBOFF model and open water characteristics of the INSEAN E1619 propeller were compared to the experimental measurements to validate the numerical method. Then, the flow field around the SUBOFF model fitted with the INSEAN E1619 propeller was simulated at the self-propulsion point by RANS and DES turbulence models, respectively. Finally, the time histories of the predicted propeller load and corresponding frequency spectra were compared between these two turbulence models to reveal their differences. It is found that the RANS model can successfully capture the main flow field features and predict the mean propeller loads. The DES model was able to simulate the wake flow field with much more useful details and predict the propeller loads with much larger fluctuations than RANS. The fluctuation of blade hydrodynamic loads is highly correlated with the wake turbulence intensity. In addition, it is found that the phase-averaged evolution course of the propeller force predicted by the DES model is almost the same as that directly predicted by the RANS model.

对水下航行器尾流场和螺旋桨激振力进行数值模拟，以评估k-ω SST RANS 和k-ω 的性能IDDES 湍流模型。首先，将 SUBOFF 模型的标称尾流和 INSEAN E1619 螺旋桨的开放水域特性与实验测量值进行比较，以验证数值方法。然后，分别通过RANS和DES湍流模型在自航点模拟了装有INSEAN E1619螺旋桨的SUBOFF模型周围的流场。最后，比较了这两种湍流模型之间预测的螺旋桨载荷的时间历程和相应的频谱，以揭示它们的差异。发现RANS模型能够成功捕捉主要流场特征并预测螺旋桨平均载荷。DES 模型能够以更多有用的细节模拟尾流流场，并预测螺旋桨载荷的波动比 RANS 大得多。叶片水动力载荷的波动与尾流湍流强度高度相关。此外，发现DES模型预测的螺旋桨力的相位平均演化过程与RANS模型直接预测的几乎相同。