| 参考文献：Peng, S.-H., Leicher, S., and Haase, W., DES and Hybrid RANS-LES Modelling of Unsteady Pressure Oscillations and Flow Features in a Rectangular Cavity, 2nd Symposium onHybrid RANS-LES Methods, Corfu, Greece, 17-18 June 2007 计算模型： 计算网格：为了减小计算量，本文采用二维简化模型进行原理性验证，共19414 个Cell。 物理模型：SAS 分离涡模拟 Air: ideal-gas Viscous Model: Scale-Adaptive Simulation P-V Coupling: Fractional Step Spatial-Discretization: Least Squares Cell Based, Second Order, Bounded Central Differencing, Second Order Upwind Transient Formulation: Second Order Implicit Courant Number: 50 Momentum ERF: 0.4 Pressure ERF: 0.5 Time Step Size: 5E-5 Total Time: 0.4s Acoustics Model: Ffowcs-Wiliams & Hawkings + CAA 方法 计算结果： 1)稳态初场和瞬态流场的湍流度比较 2)涡量云图(10-10000) 3)监测点的压力脉动监测 4)监测点的声压-频率曲线 5)结论 从计算可以看出，二维简化模型只能定性的预测声压分布趋势，无法准确和实验数据吻合。而Greg 的三维计算则和实验吻合很好。 本文摘录自网络资源《ANSYS Fluent 气动噪声模型使用指南》 |
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