一种新型的动态RANS/LES混合方法

推进技术 ›› 2017, Vol. 38 ›› Issue (9): 1950-1955.

一种新型的动态RANS/LES混合方法

赵瑞¹,王超¹,李海波²,李跃军³

北京理工大学宇航学院，北京 100081,北京理工大学宇航学院，北京 100081,北京强度环境研究所可靠性与环境工程技术重点实验室，北京 100076,中国兵器工业导航与控制技术研究所，北京 100089

发布日期:2021-08-15
作者简介:赵瑞，男，博士，讲师，研究领域为高超声速湍流模拟方法。
基金资助:
民用航天项目；国家自然科学基金(11402024)；北京理工大学优秀青年教师资助计划(2014YG0102)。

A New Version of Dynamic RANS/LES Hybrid Method

School of Aerospace Engineering，Beijing Institute of Technology，Beijing 100191，China,School of Aerospace Engineering，Beijing Institute of Technology，Beijing 100191，China,Science and Technology on Reliability and Environment Engineering Laboratory，Beijing Institute of Structure and Environment Engineering，Beijing 100076，China and Institute of Navigation and Control Technology，Beijing 100089，China

Published:2021-08-15

摘要/Abstract

摘要： 为解决RANS/LES混合方法过渡依赖网格疏密的问题，使用熵函数fs作为交界面函数构造一种新型的动态RANS/LES混合方法。同时采用脱体涡模拟方法(DES97)，对平板边界层流动、超声速凹腔-压缩拐角流动以及超声速底部流动进行数值模拟，并与实验数据进行对比。结果表明，无论对于附体流动区域还是分离区域，fs都能够动态地指示出边界层的范围。构造的动态RANS/LES混合方法能够显著缓解DES97由于网格因素导致的雷诺应力模化不足的现象，同时保证分离区域涡结构的求解精度。另外，熵函数fs是从能量耗散的角度进行构造，并不依赖于特定的湍流变量，因此更具有普适性。

关键词: 混合方法；脱体涡模拟方法；熵；计算流体力学

Abstract: A new version of RANS/LES hybrid method with the entropy function fs as the blending function is proposed to avoid the dependence on the grid. Three test cases including supersonic turbulent boundary-layer flow，supersonic cavity-ramp flow and supersonic base flow are chosen to evaluate its performance. The results of the original detached-eddy simulation (DES97) are also included for comparison. It shows that turbulent boundary-layer region is reliably denoted by fs for both attached and separated flows. Compared by the results of DES97，the modeled stress depletion (MSD) phenomenon induced by refined grid is largely suppressed without loss of LES content after massive separation. Moreover，fs is deduced from the point of energy dissipation，independent of any particular turbulent quantities. That is，this entropy function could be utilized by other RANS/LES strategies.

Key words: Hybrid method；Detached-eddy simulation；Entropy；Computational fluid dynamics

赵瑞,王超,李海波,李跃军. 一种新型的动态RANS/LES混合方法[J]. 推进技术, 2017, 38(9): 1950-1955.

ZHAO Rui¹,WANG Chao¹,LI Hai-bO²,LI Yue-jun³. A New Version of Dynamic RANS/LES Hybrid Method[J]. Journal of Propulsion Technology, 2017, 38(9): 1950-1955.

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