Comparison of direct numerical simulations of turbulent flames using compressible or low-Mach number formulations

2002 ◽  
Vol 39 (6) ◽  
pp. 497-515 ◽  
Author(s):  
J. de Charentenay ◽  
D. Thévenin ◽  
B. Zamuner
Keyword(s):  
Mach Number ◽  
Numerical Simulations ◽  
Turbulent Flames ◽  
Direct Numerical Simulations ◽  
Low Mach Number

Towards direct numerical simulations of low-Mach number turbulent reacting and two-phase flows using immersed boundaries

2016 ◽  
Vol 131 ◽  
pp. 123-141 ◽  
Author(s):  
Abouelmagd Abdelsamie ◽  
Gordon Fru ◽  
Timo Oster ◽  
Felix Dietzsch ◽  
Gábor Janiga ◽  
...  
Keyword(s):  
Mach Number ◽  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Two Phase Flows ◽  
Two Phase ◽  
Low Mach Number ◽  
Immersed Boundaries

scholarly journals Direct Numerical Simulations of the Impact of High Turbulence Intensities and Volume Viscosity on Premixed Methane Flames

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Gordon Fru ◽  
Gábor Janiga ◽  
Dominique Thévenin
Keyword(s):  
Numerical Simulations ◽  
Heat Release ◽  
Turbulent Flame ◽  
Flame Structure ◽  
Turbulent Flames ◽  
Direct Numerical Simulations ◽  
Turbulent Reynolds Number ◽  
Volume Viscosity ◽  
Flame Structures ◽  
The Impact

Parametric direct numerical simulations (DNS) of turbulent premixed flames burning methane in the thin reaction zone regime have been performed relying on complex physicochemical models and taking into account volume viscosity (κ). The combined effect of increasing turbulence intensities (u′) andκon the resulting flame structure is investigated. The turbulent flame structure is marred with numerous perforations and edge flame structures appearing within the burnt gas mixture at various locations, shapes and sizes. Stepping upu′from 3 to 12 m/s leads to an increase in the scaled integrated heat release rate from 2 to 16. This illustrates the interest of combustion in a highly turbulent medium in order to obtain high volumetric heat release rates in compact burners. Flame thickening is observed to be predominant at high turbulent Reynolds number. Via ensemble averaging, it is shown that both laminar and turbulent flame structures are not modified byκ. These findings are in opposition to previous observations for flames burning hydrogen, where significant modifications induced byκwere found for both the local and global properties of turbulent flames. Therefore, to save computational resources, we suggest that the volume viscosity transport term be ignored for turbulent combustion DNS at low Mach numbers when burning hydrocarbon fuels.

Direct Numerical Simulations of turbulent flames to analyze flame/acoustic interactions

2009 ◽  
pp. 239-268 ◽  
Author(s):  
G. Fru ◽  
H. Shalaby ◽  
A. Laverdant ◽  
C. Zistl ◽  
G. Janiga ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Turbulent Flames ◽  
Direct Numerical Simulations

scholarly journals Numerical simulations of a transient injection flow at low Mach number regime

2008 ◽  
Vol 76 (5) ◽  
pp. 662-696 ◽  
Author(s):  
A. Beccantini ◽  
E. Studer ◽  
S. Gounand ◽  
J.-P. Magnaud ◽  
T. Kloczko ◽  
...  
Keyword(s):  
Mach Number ◽  
Numerical Simulations ◽  
Low Mach Number ◽  
Injection Flow
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