Model of fourth-order cumulants for description of turbulent transport by large-scale vortex structures

1999 ◽  
Vol 40 (5) ◽  
pp. 871-876 ◽  
Author(s):  
B. B. Ilyushin
Keyword(s):  
Fourth Order ◽  
Large Scale ◽  
Turbulent Transport ◽  
Vortex Structures ◽  
Large Scale Vortex

ON IMPACT OF LARGE-SCALE VORTEX STRUCTURES ON FLAME SHAPE IN A SWIRLING JET FLOW

2018 ◽  
Vol 11 (2) ◽  
pp. 31-39
Author(s):  
L. М. Chikishev ◽  
◽  
V. М. Dulin ◽  
A. S. Lobasov ◽  
D. М. Markovich ◽  
...  
Keyword(s):  
Large Scale ◽  
Jet Flow ◽  
Vortex Structures ◽  
Swirling Jet ◽  
Large Scale Vortex ◽  
Flame Shape

Nonlinear dynamics of large-scale vortex structures in a turbulent Ekman layer

2007 ◽  
Vol 42 (4) ◽  
pp. 571-580 ◽  
Author(s):  
V. M. Ponomarev ◽  
O. G. Chkhetiani ◽  
L. V. Shestakova
Keyword(s):  
Nonlinear Dynamics ◽  
Large Scale ◽  
Ekman Layer ◽  
Vortex Structures ◽  
Large Scale Vortex

Large-scale vortex structures in shear flows

2000 ◽  
Vol 19 (6) ◽  
pp. 831-854 ◽  
Author(s):  
Viktor P. Goncharov ◽  
Vadim I. Pavlov
Keyword(s):  
Large Scale ◽  
Shear Flows ◽  
Vortex Structures ◽  
Large Scale Vortex

PARTICLE DISPERSION BY LARGE SCALE VORTEX STRUCTURES

1989 ◽  
Vol 7 (3) ◽  
pp. 201-207 ◽  
Author(s):  
R. A. GORE ◽  
C. T. CROWE ◽  
N. KAMALU ◽  
T. R. TROUTT ◽  
J. J. RILEY
Keyword(s):  
Large Scale ◽  
Particle Dispersion ◽  
Vortex Structures ◽  
Large Scale Vortex

Particle Dispersion by Vortex Structures in Plane Mixing Layers

1992 ◽  
Vol 114 (4) ◽  
pp. 657-666 ◽  
Author(s):  
F. Wen ◽  
N. Kamalu ◽  
J. N. Chung ◽  
C. T. Crowe ◽  
T. R. Troutt
Keyword(s):  
Large Scale ◽  
Response Times ◽  
Mixing Layer ◽  
Particle Dispersion ◽  
Vortex Structures ◽  
Dispersion Process ◽  
Dispersion Mechanism ◽  
Large Scale Vortex ◽  
Air Streams ◽  
Part Model

The dispersion of particles in a plane mixing layer between two air streams is investigated using experimental and numerical techniques. The results show that large-scale spanwise vortices strongly influence the particle dispersion process. Particles with aerodynamic response times on the order of the large scale vortex time scales are found to concentrate near the outer edges of the vortex structures. Time average velocity measurements also demonstrate that these particles tend to move away from the center of the mixing layer. Substantial changes in the lateral particle dispersion are producible by controlled forcing of the vortex structures. Comparisons between the experimental particle dispersion patterns and numerical simulations show striking similarities. A two-part model involving stretching and folding is suggested as a particle dispersion mechanism.

Modulations on turbulent characteristics by dispersed particles in gas–solid jets

2005 ◽  
Vol 461 (2062) ◽  
pp. 3279-3295 ◽  
Author(s):  
Kun Luo ◽  
Jianren Fan ◽  
Kefa Cen
Keyword(s):  
Large Scale ◽  
Stokes Number ◽  
Vortex Structures ◽  
Half Width ◽  
Mean Velocity ◽  
Turbulent Characteristics ◽  
Velocity Decay ◽  
Large Scale Vortex ◽  
High Reynolds ◽  
The One

A direct numerical simulation technique combined with a two-way coupling method was developed to study a gas–solid turbulent jet with a moderately high Reynolds number. The flow was weakly compressible and spatially developing. A high-resolution solver was performed for the gas phase flow-field and the Lagrangian method was used to trace particles. The modulations on flow structures and other turbulent characteristics by particles at different Stokes numbers were investigated. It is found that the particles at Stokes numbers of 0.01 and 50 can advance the development of the large-scale vortex structures and make the turbulence intensity profiles wider and lower, but the particles at a Stokes number of 1 delay the evolution of the large-scale vortex structures and decrease the turbulence intensities. The jet velocity half-width and the decay of the streamwise mean velocity in the jet centreline are reduced by all particles, in which particles at a Stokes number of 0.01 result in a larger reduction of the velocity half-width and particles at a Stokes number of 1 lead to a larger reduction of the streamwise mean velocity decay. All particles decrease the vorticity thickness, but increase the fluid momentum thickness. In addition, the two-way coupled particle distribution is more uniform than that of the one-way coupled case.

scholarly journals DIMPLE GENERATOR OF VORTEX STRUCTURES

2021 ◽  
pp. 95-102
Author(s):  
A. V. Voskobijnyk ◽  
V. M. Turick ◽  
O. A. Voskoboinyk ◽  
V. A. Voskoboinick
Keyword(s):  
Large Scale ◽  
Vortex Flow ◽  
Flat Surface ◽  
Pressure Fluctuations ◽  
Experimental Studies ◽  
Vortex Structures ◽  
Small Scale ◽  
Wall Pressure Fluctuations ◽  
Large Scale Vortex ◽  
Streamlined Surface

The paper presents the results of experimental studies of the space-time characteristics of the velocity and pressure field inside a hemispherical dimple on a flat surface. The features of the formation and development of vortex structures generated inside the dimple, as well as their interaction with the streamlined surface of the dimple and the boundary layer were established. Integral, spectral and correlation characteristics of the field of velocity, dynamic and wall pressure fluctuations were obtained. The velocities and directions of transfer of large-scale vortex structures and small-scale vortices inside the dimple were determined. The frequencies of rotations and ejections of large-scale vortices, the frequencies of oscillations of the vortex flow inside the dimple and self-oscillations of the vortex structures of the shear layer, their subharmonics and harmonics of higher orders were established.

Visualization of the large-scale vortex structures in excited turbulent jets

2003 ◽  
Vol 6 (3) ◽  
pp. 303-311 ◽  
Author(s):  
V. F. Kopiev ◽  
M. Yu. Zaitsev ◽  
S. I. Inshakov ◽  
L. P. Guriashkin
Keyword(s):  
Large Scale ◽  
Turbulent Jets ◽  
Vortex Structures ◽  
Large Scale Vortex
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