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Prediction of aerothermal characteristics of a generic hypersonic inlet flow
Theoretical and Computational Fluid Dynamics ( IF 3.4 ) Pub Date : 2021-08-25 , DOI: 10.1007/s00162-021-00587-7
Lin Fu 1 , Parviz Moin 1 , Sanjeeb Bose 2
Affiliation  

Accurate prediction of aerothermal surface loading is of paramount importance for the design of high-speed flight vehicles. In this work, we consider the numerical solution of hypersonic flow over a double-finned geometry, representative of the inlet of an air-breathing flight vehicle, characterized by three-dimensional intersecting shock-wave/turbulent boundary layer interaction at Mach 8.3. High Reynolds numbers (\(Re_L \approx 11.6 \times 10^6\) based on free-stream conditions) and the presence of cold walls (\(T_w/T_\circ \approx 0.26\)) leading to large near-wall temperature gradients necessitate the use of wall-modeled large eddy simulation (WMLES) in order to make calculations computationally tractable. The comparison of the WMLES results with experimental measurements shows good agreement in the time-averaged surface heat flux and wall pressure distributions, and the WMLES predictions show reduced errors with respect to the experimental measurements than prior RANS calculations. The favorable comparisons are obtained using a standard LES wall model based on equilibrium boundary layer approximations despite the presence of numerous non-equilibrium conditions including three-dimensionality in the mean, shock/boundary layer interactions, and flow separation. We demonstrate that the use of semi-local eddy viscosity scaling (in lieu of the commonly used van Driest scaling) in the LES wall model is necessary to accurately predict the surface pressure loading and heat fluxes.



中文翻译:

通用高超音速进气流的空气热特性预测

空气热表面载荷的准确预测对于高速飞行器的设计至关重要。在这项工作中,我们考虑了双翅几何结构上高超声速流动的数值解,代表了吸气式飞行器的入口,其特征是 8.3 马赫的三维交叉激波/湍流边界层相互作用。高雷诺数(\(Re_L \approx 11.6 \times 10^6\)基于自由流条件)和冷壁的存在(\(T_w/T_\circ \approx 0.26\)) 导致大的近壁温度梯度需要使用壁建模的大涡模拟 (WMLES) 以使计算在计算上易于处理。WMLES 结果与实验测量结果的比较表明,时间平均表面热通量和壁面压力分布具有良好的一致性,并且 WMLES 预测显示与之前的 RANS 计算相比,实验测量的误差减少了。尽管存在许多非平衡条件,包括平均三维度、冲击/边界层相互作用和流动分离,但使用基于平衡边界层近似的标准 LES 壁模型获得了有利的比较。

更新日期:2021-08-26
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