网格质量评价指标对汽车外流场模拟结果影响的研究
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摘要
为揭示多个网格质量评价指标对气动阻力系数和外流场模拟结果的影响,以MIRA阶梯背国际标模外流场模拟结果为参照,以湖南大学HD-2风洞试验结果进行验证,分析了分别保证5项不同的网格质量评价指标时的模拟精度。结果表明:综合评定指标、纵横比指标、最小角指标、最大正交性指标和歪斜率指标对气动阻力系数的计算均能达到工程精度要求,且对汽车尾涡的模拟均较准确,而仅有综合评价指标能较好地模拟出汽车背部涡流,但涡的大小仍不准确。因此,目前所用的网格质量评价指标尚不能完全满足车身周围流场精细分析的要求。
For revealing the influence of multiple mesh quality evaluation criteria on the simulation results of aerodynamic drag and surrounding flow field,the simulation accuracies are analyzed when five different mesh quality evaluation criteria are assured respectively,with the simulation results of surrounding flow field of international standard notch back MIRA model as reference and verified by the test results of HD-2 wind tunnel in Hunan University.The results show that all criteria of "Quality", "Aspect Ratio", "Min Angle", "Max Orthogls" and "Skew" can meet the engineering accuracy reqirements in aerodynamic drag calculation and wake vortex simulation.Only "Quality" criterion can better simulate the back vortex of MIRA model,but is still not accurate enough in size.So these mean that the mesh quality evaluation criteria currently used still can not well meet the requirements of meticulous analysis on the surrounding flow field of vehicle body.
For revealing the influence of multiple mesh quality evaluation criteria on the simulation results of aerodynamic drag and surrounding flow field,the simulation accuracies are analyzed when five different mesh quality evaluation criteria are assured respectively,with the simulation results of surrounding flow field of international standard notch back MIRA model as reference and verified by the test results of HD-2 wind tunnel in Hunan University.The results show that all criteria of "Quality", "Aspect Ratio", "Min Angle", "Max Orthogls" and "Skew" can meet the engineering accuracy reqirements in aerodynamic drag calculation and wake vortex simulation.Only "Quality" criterion can better simulate the back vortex of MIRA model,but is still not accurate enough in size.So these mean that the mesh quality evaluation criteria currently used still can not well meet the requirements of meticulous analysis on the surrounding flow field of vehicle body.
引文
[1]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.
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[6]李海峰,吴冀川,等.有限元网格剖分与网格质量判定指标[J].中国机械工程,2012,23(3):368-377.
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[10]熊超强,臧孟炎,范秦寅.低阻力汽车外流场的数值模拟及其误差分析[J].汽车工程,2012,34(1):36-45.
[11]余皓,杨志刚,朱晖.两厢车空气动力阻力数值解与网格无关性研究[J].计算机仿真,2013(1):227-231.
[2]曹红梅,郭彦.计算网格评估方法[J].太原师范学院学报(自然科学版),2008(12):41-43.
[3]陈立岗.面向工程与科学计算的表面网格处理方法的若干问题研究[D].杭州:浙江大学,2008.
[4]周喆,吕思哲.基于Loose r-sample的网格质量保持技术[J].计算机工程,2012(8):219-222.
[5]董亮,刘厚林,等.离心泵四面体网格质量衡量准则及优化算法[J].西安交通大学学报,2011(11):100-105.
[6]李海峰,吴冀川,等.有限元网格剖分与网格质量判定指标[J].中国机械工程,2012,23(3):368-377.
[7]聂春戈,刘剑飞,等.四面体网格质量度量准则的研究[J].计算力学学报,2003,20(5):579-582.
[8]Hetmaniuk U,Knupp P.A Mesh Optimization Algorithm to Decrease the Maximum Interpolation Error of Linear Triangular Finite Elements[J].Engineering with Computers,2010,27(1);3-15.
[9]谷正气.汽车空气动力学[M].北京:机械工业出版社,2005.
[10]熊超强,臧孟炎,范秦寅.低阻力汽车外流场的数值模拟及其误差分析[J].汽车工程,2012,34(1):36-45.
[11]余皓,杨志刚,朱晖.两厢车空气动力阻力数值解与网格无关性研究[J].计算机仿真,2013(1):227-231.