汽车工程

汽车工程

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汽车表面湍流压力脉动的计算精度研究

王俊1, 陈如意1,2   

  1. 1. 重庆长安汽车股份有限公司汽车工程研究总院,重庆 401120；2. 汽车噪声振动和安全技术国家重点实验室, 重庆 401120
  • 出版日期:2019-03-05 发布日期:2019-03-05
  • 基金资助:
     

Numerical simulation accuracy investigation of turbulent pressure fluctuation on vehicle surface

    

  1.  
  • Online:2019-03-05 Published:2019-03-05
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摘要： 通过运用脱涡模拟 (DES)方法对两种网格尺寸及两种几何细节的模型进行计算流体动力学 (CFD)分析，获得侧窗表面的湍流脉动声压级与风洞试验结果对比，结果表明1mm网格的精度较高，避免了2mm网格在2000Hz以后出现明显误差的情况，造型模型在100Hz低频下误差稍大于整车模型，但是在中频和高频上的精度等同于整车模型。Q准则显示1mm网格可以捕捉更小的涡核，涡核的涡量亦更大一些，这是1mm网格在高频上更精确的原因。考虑到计算效率，建议湍流压力脉动的计算采用造型模型并且在侧窗区域使用1mm的加密区。

关键词: CFD, 湍流压力脉动, 脱涡模拟, 风洞测试

Abstract: CFD analysis of two kinds of mesh size and two kinds of geometric details is carried out by using DES (Detected Eddy Simulation) method. Turbulent fluctuating sound pressure level on the side window surface is obtained and compared with the wind tunnel test results. The results show that the accuracy of 1mm mesh is higher and the obvious error of 2mm mesh after 2000Hz is avoided. The style model error is slightly larger than the whole vehicle model at below 100Hz low frequency, but the accuracy at middle and high frequency is exactly the same as that of the whole vehicle model. Q-criterion shows that 1mm mesh can capture smaller vortex cores and larger vorticity, which is the reason why 1mm mesh is more accurate in high frequency. Considering the computational efficiency, it is suggested that a style model can be used for the simulation of turbulent pressure fluctuation and a 1 mm densified zone should be used in the side window region.

Key words: CFD, turbulent pressure fluctuation, DES, wind tunnel test

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