面向非结构混合网格高精度阻力预测的梯度求解方法

doi:10.7527/S1000-6893.2017.121415

流体力学与飞行力学

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面向非结构混合网格高精度阻力预测的梯度求解方法

张培红, 张耀冰, 周桂宇, 陈江涛, 邓有奇

中国空气动力研究与发展中心计算空气动力研究所, 绵阳 621000

收稿日期:2017-05-15 修回日期:2017-07-12 出版日期:2018-01-15 发布日期:2018-01-15
通讯作者: 周桂宇,E-mail:zhouguiyu29@163.com E-mail:zhouguiyu29@163.com
基金资助:
国家自然科学基金（11532016）

Gradient calculation method of unstructured mixed grids for improving drag prediction accuracy

ZHANG Peihong, ZHANG Yaobing, ZHOU Guiyu, CHEN Jiangtao, DENG Youqi

Computational Aerodynamic Institute, China Aerodynamic Research and Development Center, Mianyang 621000, China

Received:2017-05-15 Revised:2017-07-12 Online:2018-01-15 Published:2018-01-15
Supported by:
National Natural Science Foundation of China (11532016)

摘要/Abstract

摘要： 针对非结构混合网格的特点，通过改进传统的Green-Gauss梯度求解方法，提出了一种可提高非结构混合网格黏性计算精度的节点型Green-Gauss梯度求解方法。利用改进后的方法，完成了DLR-F4翼身组合体算例的计算和对比分析。改进后的梯度求解方法残差收敛更好，下降量级更多，阻力系数和试验吻合更好，激波区域压力分布和分离区域流场细节的模拟更精确，说明改进后的梯度求解方法有效提高了程序的鲁棒性和阻力预测精度，验证了方法的有效性。采用改进后的方法对第5届AIAA阻力预测研讨会的通用研究模型（CRM）进行了详细的模拟分析，结果表明：改进的梯度求解方法更加适用于非结构混合网格的黏性计算，计算精准度达到国际同类CFD软件水平，进一步验证了改进方法的可靠性。

关键词: 混合网格, 阻力预测, 梯度求解, DLR-F4翼身组合体, CRM

Abstract: Based on the characteristics of the unstructured hybrid grid, a new gradient calculation method named node-based Green-Gauss is presented by improving the original Green-Gauss method. To validate the new method, a numerical simulation of the DLR-F4 wing-body configuration is performed. The numerical results are analyzed and compared with that of the original Green-Gauss method. The results indicate that better residual convergence and more order of magnitude decrease can be obtained with the new method, the drag coefficients show a good agreement with experiment results, and the pressure distributions in the shock wave and separation region can be computed more accurately. It is found that the new method has excellent drag prediction accuracy and more robustness. Moreover, the Common Research Model (CRM) adopted in the 5th AIAA Drag Prediction Workshop is studied by using the method proposed. The results demonstrate that the new method is much more suitable for computation of viscosity of the unstructured hybrid grid, and the accuracy reaches the same level of famous CFD software. All of this further verify the drag prediction accuracy of the new method.

Key words: hybrid grid, drag prediction, gradient calculation, DLR-F4 wing-body configuration, Common Research Model

中图分类号:

V211.7

张培红, 张耀冰, 周桂宇, 陈江涛, 邓有奇. 面向非结构混合网格高精度阻力预测的梯度求解方法[J]. 航空学报, 2018, 39(1): 121415-121415.

ZHANG Peihong, ZHANG Yaobing, ZHOU Guiyu, CHEN Jiangtao, DENG Youqi. Gradient calculation method of unstructured mixed grids for improving drag prediction accuracy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(1): 121415-121415.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

面向非结构混合网格高精度阻力预测的梯度求解方法

Gradient calculation method of unstructured mixed grids for improving drag prediction accuracy

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