Numerical simulation of the instability development in a compressible mixing layer using kinetic and continuum approaches

2019 ◽  
Author(s):  
A. N. Kudryavtsev ◽  
S. O. Poleshkin ◽  
A. A. Shershnev
Keyword(s):  
Numerical Simulation ◽  
Mixing Layer ◽  
Compressible Mixing Layer ◽  
Instability Development

Numerical simulation of the compressible mixing layer past an axisymmetric trailing edge

2007 ◽  
Vol 591 ◽  
pp. 215-253 ◽  
Author(s):  
FRANCK SIMON ◽  
SEBASTIEN DECK ◽  
PHILIPPE GUILLEN ◽  
PIERRE SAGAUT ◽  
ALAIN MERLEN
Keyword(s):  
Numerical Simulation ◽  
Shear Layer ◽  
Large Scale ◽  
Free Stream ◽  
Mixing Layer ◽  
Adverse Pressure Gradient ◽  
Layer Growth ◽  
Trailing Edge ◽  
Azimuthal Mode ◽  
Compressible Mixing Layer

Numerical simulation of a compressible mixing layer past an axisymmetric trailing edge is carried out for a Reynolds number based on the diameter of the trailing edge approximately equal to 2.9 × 106. The free-stream Mach number at separation is equal to 2.46, which corresponds to experiments and leads to high levels of compressibility. The present work focuses on the evolution of the turbulence field through extra strain rates and on the unsteady features of the annular shear layer. Both time-averaged and instantaneous data are used to obtain further insight into the dynamics of the flow. An investigation of the time-averaged flow field reveals an important shear-layer growth rate in its initial stage and a strong anisotropy of the turbulent field. The convection velocity of the vortices is found to be somewhat higher than the estimated isentropic value. This corroborates findings on the domination of the supersonic mode in planar supersonic/subsonic mixing layers. The development of the shear layer leads to a rapid decrease of the anisotropy until the onset of streamline realignment with the axis. Due to the increase of the axisymmetric constraints, an adverse pressure gradient originates from the change in streamline curvature. This recompression is found to slow down the eddy convection. The foot shock pattern features several convected shocks emanating from the upper side of the vortices, which merge into a recompression shock in the free stream. Then, the flow accelerates and the compressibility levels quickly drop in the turbulent developing wake. Some evidence of the existence of large-scale structures in the near wake is found through the domination of the azimuthal mode m = 1 for a Strouhal number based on trailing-edge diameter equal to 0.26.

Direct numerical simulation of vortex structures during the late stage of the transition process in a compressible mixing layer

2021 ◽  
Vol 33 (5) ◽  
pp. 054108
Author(s):  
Daotong Chong ◽  
Yuping Bai ◽  
Quanbin Zhao ◽  
Weixiong Chen ◽  
Junjie Yan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Late Stage ◽  
Mixing Layer ◽  
Transition Process ◽  
Vortex Structures ◽  
Compressible Mixing Layer
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