面向混合网格高精度阻力预测的熵修正方法

doi:10.7527/S1000-6893.2018.22019

流体力学与飞行力学

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面向混合网格高精度阻力预测的熵修正方法

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:2018-01-15 修回日期:2018-03-17 出版日期:2018-09-15 发布日期:2018-04-09
通讯作者: 周桂宇 E-mail:zhouguiyu29@163.com
基金资助:
国家重点研发计划战略高技术重点专项（17H86303ZT001018）

Entropy correction method for high accuracy drag prediction with mixed grids

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

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

Received:2018-01-15 Revised:2018-03-17 Online:2018-09-15 Published:2018-04-09
Supported by:
National Specialized Fund for Strategic High-tech Research and Development of China (17H86303ZT001018)

摘要/Abstract

摘要： Roe通量差分分裂格式具有耗散小、分辨率高等特点，在亚跨超声速流场模拟中得到广泛应用，但空间离散时需要对Roe平均矩阵的特征值进行熵修正，使用熵修正会增大耗散，影响阻力的求解精度。本文针对非结构混合网格中Roe格式熵修正的特点，通过改进传统的Roe格式Harten-Yee熵修正方法，提出了一种可提高非结构混合网格黏性计算精度的Harten-Yee熵修正改进方法。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，改进后的熵修正方法残差收敛特性与原始Harten-Yee熵修正一致，计算精度提高，计算结果和无熵修正时基本一致，说明改进后的熵修正方法既保留了使用熵修正带来的程序鲁棒性等优点，同时把熵修正对阻力预测精度的影响降到了最低，验证了方法的有效性。采用改进后方法对第3届AIAA阻力会议的计算模型DLR-F6翼身组合体进行了详细的模拟，分析了网格收敛性和雷诺数的影响。结果表明：改进的Harten-Yee熵修正，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, Roe格式, 熵修正, DLR-F4翼身组合体, DLR-F6翼身组合体

Abstract: The Roe flux-difference splitting scheme is widely used to simulate subsonic and transonic flow fields due to its characteristics of small dissipation, high resolution, etc. However, an entropy correction method should be proposed when the space is discrete. And the entropy correction will increase dissipation and affect the prediction accuracy of drags. Based on the characteristics of entropy correction for the Roe scheme of the unstructured hybrid grid, a new entropy correction method is presented by improving the original Harten-Yee entropy correction 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 Harten-Yee entropy correction method and no-entropy method. The results indicate that the same residual convergence and more accurate results can be obtained with the new method, and the results show a good agreement with experiment results and the results obtained with no-entropy method. It is found that the new method not only retains the advantages such as robustness, but also minimizes the effect on the prediction accuracy of drags. That verifies the effectiveness of the new method. The DLR-F6 wing-body model of the 3th AIAA Drag Prediction Workshop is studied elaborately using the new method. The influences of grid convergence and Reynolds numbers are studied. The results demonstrate that the new method is much more suitable for viscous calculation of the unstructured hybrid grid, and the precision is similar to the corresponding CFD software. The drag prediction accuracy of the new method is further verified.

Key words: hybrid grid, drag prediction, Roe scheme, entropy correction, DLR-F4 wing-body configuration, DLR-F6 wing-body configuration

中图分类号:

V211.7

张培红, 张耀冰, 周桂宇, 陈江涛, 邓有奇. 面向混合网格高精度阻力预测的熵修正方法[J]. 航空学报, 2018, 39(9): 122019-122030.

ZHANG Peihong, ZHANG Yaobing, ZHOU Guiyu, CHEN Jiangtao, DENG Youqi. Entropy correction method for high accuracy drag prediction with mixed grids[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(9): 122019-122030.

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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

面向混合网格高精度阻力预测的熵修正方法

Entropy correction method for high accuracy drag prediction with mixed grids

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