Coherent structures in a compressible turbulent plane jet

2021 ◽  
Vol 33 (10) ◽  
pp. 105109
Author(s):  
Qilin Liu ◽  
Huanxin Lai
Keyword(s):  
Coherent Structures ◽  
Turbulent Plane ◽  
Plane Jet

On the influence of coherent structures upon interscale interactions in turbulent plane jets

2002 ◽  
Vol 473 ◽  
pp. 103-145 ◽  
Author(s):  
C. B. da SILVA ◽  
O. MÉTAIS
Keyword(s):  
Kinetic Energy ◽  
Coherent Structures ◽  
Energy Transport ◽  
Local Equilibrium ◽  
Coherent Vortices ◽  
Free Shear Layers ◽  
Plane Jets ◽  
Energy Exchanges ◽  
Turbulent Plane ◽  
Plane Jet

The influence of the coherent structures on grid/subgrid-scale (GS/SGS) interactions in free shear layers is analysed through the application of a top-hat filter to several plane jet direct numerical simulations (DNS). The Reynolds number based on the plane jet inlet slot width is Reh = 3000. The study deals with energy containing (Kelvin–Helmholtz) and inertial range (streamwise) vortices, from the far field of the turbulent plane jet. The most intense kinetic energy exchanges between GS and SGS occur near these structures and not randomly in the space. The GS kinetic energy is dominated by GS advection and GS pressure/velocity interactions which appear located next to the Kelvin–Helmholtz rollers. Surprisingly, GS/SGS transfer is not very well correlated with the coherent vortices and GS/SGS diffusion plays an important role in the local dynamics of both GS and SGS kinetic energy. The so-called ‘local equilibrium assumption’ holds globally but not locally as most viscous dissipation of SGS kinetic energy takes place within the vortex cores whereas forward and backward GS/SGS transfer occurs at quite different locations. Finally, it was shown that SGS kinetic energy advection may be locally large as compared to the other terms of the SGS kinetic energy transport equation.

Interaction Region of a Two-Dimensional Turbulent Plane Jet in Still Air

1983 ◽  
pp. 411-419 ◽  
Author(s):  
L. W. B. Browne ◽  
R. A. Antonia ◽  
S. Rajagopalan ◽  
A. J. Chambers
Keyword(s):  
Interaction Region ◽  
Two Dimensional ◽  
Turbulent Plane ◽  
Plane Jet

Acoustically Induced Enhancement of Widening and Fluctuation Intensity in a Two-Dimensional Turbulent Jet

1986 ◽  
Vol 108 (3) ◽  
pp. 331-337 ◽  
Author(s):  
F. O. Thomas ◽  
V. W. Goldschmidt
Keyword(s):  
Turbulent Jet ◽  
Flow Structures ◽  
Jet Flows ◽  
Underlying Structure ◽  
Detailed Data ◽  
Initial Region ◽  
Acoustic Disturbance ◽  
Fine Grained ◽  
Turbulent Plane ◽  
Plane Jet

The enhancement of widening rate and turbulence intensity in a turbulent plane jet, due to an acoustic disturbance are considered. Detailed data at a representative Strouhal number suggest a well organized symmetric structural array in the initial region of the flow. These highly organized flow structures act as efficient agents in the transport of energy to the fine-grained turbulence, leading to greater diffusivity, enhanced turbulence and an increase in widening. The data also suggest significant differences in the underlying structure of the natural and excited jet flows, hence putting in jeopardy any generalization of coherent motions especially excited to facilitate their study.

Turbulent Plane Jet Structure

1984 ◽  
Vol 110 (10) ◽  
pp. 1485-1497 ◽  
Author(s):  
Chwen‐Yuan Guo ◽  
W. Hall C. Maxwell
Keyword(s):  
Turbulent Plane ◽  
Plane Jet ◽  
Jet Structure

Mean flow characteristics of a turbulent plane jet with buoyancy induced curvature

1989 ◽  
Vol 8 (1-2) ◽  
pp. 77-85 ◽  
Author(s):  
G. J. Hitchman ◽  
A. A. Abdel-Rahman ◽  
P. R. Slawson ◽  
A. B. Strong
Keyword(s):  
Flow Characteristics ◽  
Mean Flow ◽  
Turbulent Plane ◽  
Plane Jet
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