Influence of different sub-grid scale models on simulation accuracy of aerodynamic noise
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摘要: 大涡模拟（Large Eddy Simulation，LES）湍流模型在汽车外流场及气动噪声模拟计算分析中有着广泛的应用，高精度的非定常流场计算结果是有效进行气动噪声仿真分析的前提和基础。采用现代简易汽车模型（HSM模型），基于不同亚格子模型的LES对其进行非定常流场计算分析以及声场计算，并利用模型内部监测点的实验数据和仿真计算的结果进行对比验证。结果表明，使用WMLES模型可以得到更为准确的结果。Abstract: Based on different sub-grid scale models, the Large Eddy Simulation (LES) is used to calculate the unsteady flow field and sound field of the Hyundai Simple Model (HSM). The experimental data of the internal monitoring points of the model are used to verify the simulation results. The results show that using the WMLES model can get more accurate results.
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Key words:
- wind noise /
- sub-grid scale model /
- LES /
- HSM
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表 1 材料属性
Table 1. The material properties
材料 密度/(kg·m-3) 杨氏模量/GPa 泊松比 铝 2700 69 0.33 隔膜 2000 0.04 0.45 车窗玻璃 2500 70 0.22 空气 1.2 - - 
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表 2 吸声材料属性
Table 2. Properties of sound absorbing materials
密度/(kg·m-3) 声速/(m·s-1) 孔隙率 孔曲率 827 343 0.879 3.31
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表 3 边界条件设置
Table 3. Boundary condition setting
边界 类型 数值 Inlet Velocity inlet 110 km/h Outlet Pressure outlet 0 Pa Others Wall -
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表 4 监测点1总声压级及其误差
Table 4. Overall sound pressure level and error of monitoring point 1
SLM DSLM WALE WMLES WMLES S-Omega KET 实验值 总声压级/dB 90.1 90.8 80.4 77.2 80.2 85.9 71.6 误差/% 25.8 26.8 12.3 7.8 12.0 19.9 -
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表 5 监测点2总声压级及其误差
Table 5. Overall sound pressure level and error of monitoring point 2
SLM DSLM WALE WMLES WMLES S-Omega KET 实验值 总声压级/dB 90.3 90.4 83.7 77.5 76.1 86.2 73.1 误差/% 23.5 23.7 14.5 6.0 4.1 17.9 -
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