汽车工程

汽车工程 ›› 2019, Vol. 41 ›› Issue (11): 1281-1285.doi: 10.19562/j.chinasae.qcgc.2019.011.008

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汽车表面湍流压力脉动计算精度的研究

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
  • 收稿日期:2018-10-11 出版日期:2019-11-25 发布日期:2019-11-28
  • 通讯作者: 王俊,工程师,E-mail:wangjuncfd@163.com

A Study on Calculation Accuracy of Turbulent Pressure Fluctuation on Vehicle Surface

Wang Jun1, Chen Ruyi1,2   

  1. 1.Chongqing Changan Auto R&D Center, Changan Automobile Co., Ltd., Chongqing 401120;
    2.State Key Laboratory of Vehicle NVH and Safety Technology, Chongqing 401120
  • Received:2018-10-11 Online:2019-11-25 Published:2019-11-28

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摘要： 通过运用脱涡模拟(DES)方法对两种网格尺寸和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,并与风洞试验结果对比,结果表明:1 mm网格的精度较高,而2 mm网格在2 000 Hz以后出现明显误差;造型模型在100 Hz低频段的误差稍大于整车模型,但在中频和高频段的精度等同于整车模型。Q准则显示1 mm网格可捕捉尺寸更小而涡量更大的涡核,这也正是1 mm网格在高频段精度更高的原因。考虑到计算效率,建议采用造型模型进行湍流压力脉动的计算,且在侧窗区域使用1 mm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 on the models with two kinds of mesh size and two kinds of geometric details are carried out by using detected eddy simulation method to obtain turbulent fluctuating sound pressure level on side window surface, which is then compared with wind tunnel test results. The results show that the accuracy of 1 mm mesh is higher while the 2 mm mesh has apparent error when frequency higher than 2 000 Hz. The error of styling model is slightly larger than vehicle model at low frequency range (below 100 Hz), but is basically the same as that of vehicle model at middle and high frequency range. Q-criterion shows that 1 mm mesh can capture smaller vortex cores with larger vorticity, which is just the reason why 1 mm mesh is more accurate at high frequency range. With consideration of computational efficiency, it is recommended to use styling model for the calculation of turbulent pressure fluctuation with finer mesh (1 mm) in side window area.

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