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

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

At the final stage of the global crisis: Economic tasksin 2017-2019

2018 ◽  
pp. 5-29 ◽  
Author(s):  
V. A. Mau
Keyword(s):  
Economic Growth ◽  
Final Stage ◽  
Government Regulation ◽  
Inflation Targeting ◽  
Social Dynamics ◽  
Growth Stimulation ◽  
Central Banks ◽  
Economic Area ◽  
National Trends

The paper deals with the global and national trends of economic and social development at the final stage of the global structural crisis. Special attention is paid to intellectual challenges economists will face with in the post-crisis world: prospects of growth without inflation, new global currencies and the role of cryptocurrencies, central banks independence and their role in economic growth stimulation, new tasks and patterns of government regulation, inequality and growth. Special features of Russian post-crisis development are also under consideration. Among them: prospects of macroeconomic support of growth, inflation targeting, new fiscal rule, social dynamics and new challenges to welfare state. The paper concludes that the main obstacles for economic growth in Russia are concentrated in the non-economic area.

Light Dramaturgy as an Element of an Integrated Approach to the Creation of Museum Expositions and Exhibition Projects

2019 ◽  
pp. 108-114
Author(s):  
Nicolay R. Vorobyov
Keyword(s):  
Final Stage ◽  
Historical Development ◽  
Integrated Approach ◽  
Lighting Design ◽  
Lighting System ◽  
Scientific Concepts ◽  
Hands On ◽  
Artistic Styles ◽  
The Creation

Architectural and artistic construction of museum is one of the most complex genres in environment development and design, with its inherent qualities, means of expressiveness, principles of environment and image development, scientific concepts, in the context of historical development, artistic styles and trends. The author of the article considers the artistic lighting design in isolation from the integral dramaturgy of the project to be deeply flawed, and the setting of accent lighting at the final stage Ц to be simple, but not outstanding. Based on extensive hands-on experience in the construction of museum expositions, the author of the article reveals some peculiarities, especially significant to the participants of the lighting system setting for museums and other cultural facilities.

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