LES超声速MVG湍流来流涡环形成机理研究
LES Study on the Mechanism of Vortex Rings behind Supersonic MVG with Turbulent Inflow
摘要：
在这项研究中，我们研究了在MVG控制的斜坡流在M=2.5和Req=5760后的涡环和斜激波之间的相互作用。采用隐式大涡模拟（ILES）方法，采用5阶带宽优化WENO格式求解无滤波形式的纳维-斯托克斯方程。充分发展的入流由之前DNS模拟获得的一系列湍流廓线给出。结果表明，环形结构在穿透强激波后不会预锻破裂并保持原有的拓扑结构，斜激波受环形诱导流场的影响较大。发现了三维激波表面的凸起现象，并对其机理进行了解释。
英文摘要：
In this study, we investigate the interaction between vortex rings behind MVG and the oblique shocks in the MVG controlled ramp flow at M=2.5 and Req=5760. Implicit large eddy simulation (ILES) method is used by solving the unfiltered form of the Navier-Stokes equations with the 5th order Bandwidth-optimized WENO scheme. The fully developed inflow is given by a series of turbulent profiles obtained from previous DNS simulation. It shows that the ring structure does not break down and keeps its topology after penetrating the strong shock wave and the oblique shocks is influenced a lot by the induced flow field from rings. The bump of the 3D shock wave surface is discovered and its mechanism is explained.
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