1. 国防科技大学 空天科学学院,长沙,410073
2. 中国空气动力研究与发展中心,绵阳,621000
谢春晖(1994—),男,河南信阳人,助理工程师,研究方向:超高速湍流/转捩模型研究. E-mail:1356562657@qq.com
郑世超*,讲师,研究方向:高精度数值格式. E-mail:zhengshichao10@nudt.edu.cn
纸质出版:2024
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谢春晖, 王东方, 郑世超. 基于WCNS高精度软件平台的γ-Reθ转捩模型超高速流动应用研究[J]. 空气动力学学报, 2024, 42(12): 25−34. DOI: 10.7638/kqdlxxb-2024.0040
XIE Chunhui, WANG Dongfang, ZHENG Shichao. Application of γ-Reθ transition model for high-speed flow based on high-order WCNS platform[J]. 2024, 42(12): 25-34. DOI: 10.7638/kqdlxxb-2024.0040.
谢春晖, 王东方, 郑世超. 基于WCNS高精度软件平台的γ-Reθ转捩模型超高速流动应用研究[J]. 空气动力学学报, 2024, 42(12): 25−34. DOI: 10.7638/kqdlxxb-2024.0040 DOI:
XIE Chunhui, WANG Dongfang, ZHENG Shichao. Application of γ-Reθ transition model for high-speed flow based on high-order WCNS platform[J]. 2024, 42(12): 25-34. DOI: 10.7638/kqdlxxb-2024.0040. DOI:
为研究
γ-Re
θ
转捩模型在超高速流动中的适用性问题,本文基于WCNS高精度软件平台开展
γ-Re
θ
转捩模型的修正在超高速流动中的应用研究。首先,针对超高速湍流平板开展了二阶和五阶格式的对比研究,结果表明:高阶算法对网格分辨率要求更低,计算花费更小,对摩擦阻力系数等关注量模拟得更加精准;相比RANS方程,湍流模型方程对格式精度更敏感,更需要高精度离散。其次,在WCNS高精度软件平台上分别针对SST湍流模型和
γ、Re
θ
输运方程以及
Pr
t
进行超高速修正,通过不同马赫数的平板、尖锥算例进行了数值验证,尖锥算例考虑了等温壁和绝热壁两种壁面条件,数值结果与实验值吻合较好。最后,相比于传统的
γ-Re
θ
转捩模型,SST湍流模型修正有效改善超高速湍流区域摩擦阻力计算结果,且预测的转捩位置比其他修正方法要提前一些;
γ、Re
θ
输运方程的
Ma
修正大大改善了对于超高速流动转捩位置的预测;
Pr
t
修正有效改善超高速流动转捩区域和湍流区域绝热壁温的预测准度,对于等温壁的热流预测也稍有改进。
The prediction of boundary-layer transition is crucial for designing high-speed aircraft
yet high-fidelity high-speed transition prediction models with broad application prospects ar
e still not available. While extensive efforts have been directed towards modifying the
γ-Re
θ
transition model
which has proven effective in low-speed flows
for its application in high-speed scenarios
these refined
γ-Re
θ
models continue to encounter challenges in attaining widespread application. To develop a more practical engineering transition model
we have implemented a high-speed correction to the
γ-Re
θ
transition model
leveraging the high-order WCNS platform. Firstly
we compared the performance of second and fifth-order schemes in simulating a high-speed flat-plate turbulent boundary layer. The results reveal that the higher-order scheme delivers more accurate results
even with a coarse grid
evidenced by its precise prediction of the skin friction coefficient. This underscores the importance of employing high-order schemes for discretizing the turbulence model. Then we refined the SST turbulence model
the transport equations of
γ
and
Re
θ
as well as the turbulent Prandtl number (
Pr
t
)
yielding results in line with experimental data in a wide range of Mach numbers
geometries
and wall thermal conditions. The obtained transition model exhibits not only high accuracy in predicting the transition position but also the aerodynamic force/heat downstream of the transition front. Finally
compared to the original
γ-Re
θ
transition model
the modified SST turbulence model can effectively improve the skin friction prediction accuracy in the turbulent area
and limited improvement on the transition location. Notably
the
Ma
-modified
γ
and
Re
θ
transport equations have significantly improved the prediction accuracy of the transition location. Furthermo
re
the modified
Pr
t
effectively improves the adiabatic wall temperature in transitional and turbulent regions but slightly improves the heat flux on isothermal walls.
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