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

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

Numerical modelling of swirling momentumless turbulent wake dynamics

2018 ◽  
pp. 37-48
Author(s):  
Андрей Геннадьевич Деменков ◽  
Геннадий Георгиевич Черных
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Mathematical Models ◽  
Equations Of Motion ◽  
Turbulent Wake ◽  
The Body ◽  
Jet Flows ◽  
Reynolds Stresses ◽  
Bodies Of Revolution ◽  
Averaged Equations

С применением математической модели, включающей осредненные уравнения движения и дифференциальные уравнения переноса нормальных рейнольдсовых напряжений и скорости диссипации, выполнено численное моделирование эволюции безымпульсного закрученного турбулентного следа с ненулевым моментом количества движения за телом вращения. Получено, что начиная с расстояний порядка 1000 диаметров от тела течение становится автомодельным. На основе анализа результатов численных экспериментов построены упрощенные математические модели дальнего следа. Swirling turbulent jet flows are of interest in connection with the design and development of various energy and chemical-technological devices as well as both study of flow around bodies and solving problems of environmental hydrodynamics, etc. An interesting example of such a flow is a swirling turbulent wake behind bodies of revolution. Analysis of the known works on the numerical simulation of swirling turbulent wakes behind bodies of revolution indicates lack of knowledge on the dynamics of the momentumless swirling turbulent wake. A special case of the motion of a body with a propulsor whose thrust compensates the swirl is studied, but there is a nonzero integral swirl in the flow. In previous works with the participation of the authors, a numerical simulation of the initial stage of the evolution of a swirling momentumless turbulent wake based on a hierarchy of second-order mathematical models was performed. It is shown that a satisfactory agreement of the results of calculations with the available experimental data is possible only with the use of a mathematical model that includes the averaged equations of motion and differential equations for the transfer of normal Reynolds stresses along the rate of dissipation. In the present work, based on the above mentioned mathematical model, a numerical simulation of the evolution of a far momentumless swirling turbulent wake with a nonzero angular momentum behind the body of revolution is performed. It is shown that starting from distances of the order of 1000 diameters from the body the flow becomes self-similar. Based on the analysis of the results of numerical experiments, simplified mathematical models of the far wake are constructed. The authors dedicate this work to the blessed memory of Vladimir Alekseevich Kostomakha.

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.

Probability Calculations for Turbulent Jet Flows with Mixing and Reaction of NO and O3

1984 ◽  
Vol 37 (1-2) ◽  
pp. 59-78 ◽  
Author(s):  
P. GIVI ◽  
W. A. SIRIGNANO ◽  
S. B. POPE
Keyword(s):  
Turbulent Jet ◽  
Jet Flows

Turbulent jet flows with buoyancy and swirl

1988 ◽  
Vol 58 (3) ◽  
pp. 161-170 ◽  
Author(s):  
K. Mitsotakis ◽  
E. Zauner ◽  
W. Schneider
Keyword(s):  
Turbulent Jet ◽  
Jet Flows
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