Investigation of Vortex Breakdown and Scalar Mixing in Swirling Turbulent Jet Flows using Unified LES-RANS Models

2011 ◽  
Author(s):  
Harish Gopalan ◽  
Celestin Zemtsop ◽  
Stefan Heinz ◽  
Michael Stoellinger
Keyword(s):  
Vortex Breakdown ◽  
Turbulent Jet ◽  
Jet Flows ◽  
Scalar Mixing ◽  
Rans Models

Stochastic-Based RANS-LES Simulations of Swirling Turbulent Jet Flows

2017 ◽  
Vol 18 (5) ◽  
pp. 351-369 ◽  
Author(s):  
Michael K. Stoellinger ◽  
Stefan Heinz ◽  
Celestin P. Zemtsop ◽  
Harish Gopalan ◽  
Reza Mokhtarpoor
Keyword(s):  
Vortex Breakdown ◽  
Hybrid Methods ◽  
Turbulent Jet ◽  
Jet Flows ◽  
Flow Simulations ◽  
Swirling Jet ◽  
Les Model ◽  
Sound Theoretical Basis ◽  
Better Than ◽  
Good Agreement

AbstractMany turbulent flow simulations require the use of hybrid methods because LES methods are computationally too expensive and RANS methods are not sufficiently accurate. We consider a recently suggested hybrid RANS-LES model that has a sound theoretical basis: it is systematically derived from a realizable stochastic turbulence model. The model is applied to turbulent swirling and nonswirling jet flow simulations. The results are shown to be in a very good agreement with available experimental data of nonswirling and mildly swirling jet flows. Compared to commonly applied other hybrid RANS-LES methods, our RANS-LES model does not seem to suffer from the ’modeled-stress depletion’ problem that is observed in DES and IDDES simulations of nonswirling jet flows, and it performs better than segregated RANS-LES models. The results presented contribute to a better physical understanding of swirling jet flows through an explanation of conditions for the onset and the mechanism of vortex breakdown.

Large-Eddy Simulation of Swirling Turbulent Jet Flows in Absence of Vortex Breakdown

AIAA Journal ◽  
2009 ◽  
Vol 47 (12) ◽  
pp. 3011-3021 ◽  
Author(s):  
Celestin P. Zemtsop ◽  
Michael K. Stöllinger ◽  
Stefan Heinz ◽  
Dan Stanescu
Keyword(s):  
Large Eddy Simulation ◽  
Vortex Breakdown ◽  
Turbulent Jet ◽  
Jet Flows ◽  
Eddy Simulation ◽  
Large Eddy

Self-similarity of turbulent jet flows with internal and external intermittency

2021 ◽  
Vol 919 ◽  
Author(s):  
M. Gauding ◽  
M. Bode ◽  
Y. Brahami ◽  
É. Varea ◽  
L. Danaila
Keyword(s):  
Turbulent Jet ◽  
Jet Flows ◽  
Self Similarity

Abstract

Air Injection Through Microjets in Low Mach Number Turbulent Jet Flows

2007 ◽  
Author(s):  
Roberto Camussi ◽  
Giulio Guj ◽  
Francesco Tomassi ◽  
Pengyuan Yao ◽  
Aldo Pieroni ◽  
...  
Keyword(s):  
Mach Number ◽  
Air Injection ◽  
Turbulent Jet ◽  
Jet Flows ◽  
Low Mach Number

scholarly journals Mathematical models of swirling turbulent jet flows

2018 ◽  
Author(s):  
G. G. Chernykh ◽  
A. G. Demenkov ◽  
S. N. Yakovenko
Keyword(s):  
Mathematical Models ◽  
Turbulent Jet ◽  
Jet Flows

The final stage of the vortex breakdown in the annular swirling turbulent jet

2020 ◽  
Author(s):  
V. O. Ryzhenkov ◽  
S. S. Abdurakipov ◽  
R. I. Mullyadzhanov
Keyword(s):  
Final Stage ◽  
Vortex Breakdown ◽  
Turbulent 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.

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