On the accuracy of RANS, DES and LES turbulence models for predicting drag reduction with Base Bleed technology
On the accuracy of RANS, DES and LES turbulence models for predicting drag reduction with Base Bleed technology
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DOI：
10.1016/j.ast.2017.03.031
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发表时间：
2017-08
影响因子：
5.6
通讯作者：
F. Nicolás-Pérez;F. Velasco;J. García-Cascales;R. Otón-Martínez;A. López-Belchí;D. Moratilla;F. Rey
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文献类型：
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作者：
F. Nicolás-Pérez;F. Velasco;J. García-Cascales;R. Otón-Martínez;A. López-Belchí;D. Moratilla;F. Rey
底部排气技术是一种常用的减阻技术。本工作评估了不同RANS、DES和LES模型在跨音速和超音速（马赫数0.99-1.5）准定常条件下估算带尾旋和底部排气技术的细长体阻力系数的能力。2-本文介绍了基于RANS和DES的k-ε RNG、k-ω Standard和k-ω SST的三维和三维数值模型，以及LES Smagorinsky-Lilly、壁面自适应局部涡（WALE）和动态子网格动能方程模型，并与使用有源和非有源底部排气装置进行的专门的实验飞行测量进行了对比。结果表明，RANS和DES模型有非常有限的精度阻力预测时，面临的问题，涉及高温射流混合层与跨音速尾流的情况下，主动底部排气。尽管如此，一个合理的协议被发现之间的数值预测减阻和实验数据的情况下LES壁。
Base bleed technology is a common strategy used for body drag reduction. This work assessed the capacity of different RANS, DES and LES models to estimate the drag coefficient of slender bodies with spin and Base Bleed technology under transonic and supersonic (Mach number 0.99–1.5) quasi-steady conditions. 2-dimensional and 3-dimensional numerical models based on RANS and DES with k–ε RNG, k–ω Standard and k–ω SST, as well as LES Smagorinsky–Lilly, Wall Adapting Local Eddy (WALE) and Dynamic sub-grid Kinetic Energy Equation models were presented and benchmarked against ad-hoc experimental flight measurements performed with both active and inactive Base Bleed units. Results showed that RANS and DES models had very limited accuracy in drag prediction when facing a problem involving a high temperature jet mixing layer with a transonic wake as in the case of active Base Bleed. Notwithstanding, a reasonable agreement was found between numerical predictions of drag reduction and experimental data for the case of LES WALE.