搜索ANSYS Fluent 氣動(dòng)噪聲分析案例：圓柱繞流
2016-10-26 by:CAE仿真在線 來源:互聯(lián)網(wǎng)
參考文獻(xiàn):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;
計(jì)算模型:二維圓柱繞流
計(jì)算網(wǎng)格:33223 個(gè)Cell
物理模型1:LES 大渦模擬
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 分離渦模擬
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
計(jì)算結(jié)果比較:
1)渦量分布(10[1/s]-10000[1/s])
2)監(jiān)測(cè)位置聲壓-頻率曲線比較
3)聲壓計(jì)算和實(shí)驗(yàn)值的比較
4)結(jié)論
通過比較計(jì)算可以看出,SAS 模型和LES 模型計(jì)算結(jié)果非常接近。
本文摘錄自網(wǎng)絡(luò)資源《ANSYS Fluent 氣動(dòng)噪聲模型使用指南》
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