ANSYS Fluent 气动噪声分析案例：圆柱绕流
参考文献：Revell, J.D. ,Prydz, R.A., and Hays, A.P., Experimental Study of Airframe Noise vs.Drag Relationship for Circular Cylinders ,"Lockheed Report 28074, Feb.1977. Final Report forNASA Contract NAS1-14403;计算模型：二维圆柱绕流
计算网格：33223 个Cell
物理模型1：LES 大涡模拟
Air: Density 1.225
Viscous Model: LES Smagorinsky-Lilly
P-V Coupling: Fractional Step
Spatial-Discretization: Green-Gauss Node Based, PRESTO, Bounded Central Differencing
Transient Formulation: Second Order Implicit, Non-Iterative Time-Advancement
Time Step Size: 5E-6
Total Time: 0.03s
物理模型2：SAS 分离涡模拟
Air: Density 1.225
Viscous Model: Scale-Adaptive Simulation
P-V Coupling: Fractional Step
Spatial-Discretization: Green-Gauss Node Based, PRESTO, Bounded Central Differencing,
Second Order Upwind
Transient Formulation: Second Order Implicit, Non-Iterative Time-Advancement
Time Step Size: 5E-6
Total Time: 0.03s
Acoustics Model: Ffowcs-Wiliams & Hawkings
计算结果比较：
1)涡量分布(10-10000)
2)监测位置声压-频率曲线比较
3)声压计算和实验值的比较
4)结论
通过比较计算可以看出，SAS 模型和LES 模型计算结果非常接近。
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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