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[1/s]-10000[1/s]) 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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