On the modeling of scalar mixing timescale in filtered density function simulation of turbulent premixed flames

2020 ◽  
Vol 32 (11) ◽  
pp. 115130
Author(s):  
Tianwei Yang ◽  
Qing Xie ◽  
Hua Zhou ◽  
Zhuyin Ren
Keyword(s):  
Density Function ◽  
Premixed Flames ◽  
Scalar Mixing ◽  
Turbulent Premixed Flames ◽  
Filtered Density Function ◽  
Turbulent Premixed

scholarly journals Modelling of Conditional Scalar Dissipation Rate in Turbulent Premixed Combustion

Computation ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 26 ◽  
Author(s):  
Shokri Amzin ◽  
Mariusz Domagała
Keyword(s):  
Dissipation Rate ◽  
Premixed Flames ◽  
Moment Closure ◽  
Navier Stokes ◽  
Scalar Dissipation ◽  
Flame Surface ◽  
Scalar Dissipation Rate ◽  
Turbulent Premixed Flames ◽  
Conditional Moment ◽  
Turbulent Premixed

In turbulent premixed flames, for the mixing at a molecular level of reactants and products on the flame surface, it is crucial to sustain the combustion. This mixing phenomenon is featured by the scalar dissipation rate, which may be broadly defined as the rate of micro-mixing at small scales. This term, which appears in many turbulent combustion methods, includes the Conditional Moment Closure (CMC) and the Probability Density Function (PDF), requires an accurate model. In this study, a mathematical closure for the conditional mean scalar dissipation rate, <Nc|ζ>, in Reynolds, Averaged Navier–Stokes (RANS) context is proposed and tested against two different Direct Numerical Simulation (DNS) databases having different thermochemical and turbulence conditions. These databases consist of lean turbulent premixed V-flames of the CH4-air mixture and stoichiometric turbulent premixed flames of H2-air. The mathematical model has successfully predicted the peak and the typical profile of <Nc|ζ> with the sample space ζ and its prediction was consistent with an earlier study.

Effects of shear inhomogeneities on the structure of turbulent premixed flames

2019 ◽  
Vol 208 ◽  
pp. 63-78 ◽  
Author(s):  
Wu Jin ◽  
Scott A. Steinmetz ◽  
Mrinal Juddoo ◽  
Matthew J. Dunn ◽  
Zuohua Huang ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Turbulent Premixed Flames ◽  
Turbulent Premixed

Small Scale Features of Velocity and Scalar Fields in Turbulent Premixed Flames

2008 ◽  
Vol 82 (3) ◽  
pp. 339-358 ◽  
Author(s):  
Arnaud Mura ◽  
Vincent Robin ◽  
Michel Champion ◽  
Tatsuya Hasegawa
Keyword(s):  
Premixed Flames ◽  
Scalar Fields ◽  
Small Scale ◽  
Turbulent Premixed Flames ◽  
Turbulent Premixed

Structure and propagation speeds of turbulent premixed flames—A numerical study

1991 ◽  
Vol 83 (1-2) ◽  
pp. 155-173 ◽  
Author(s):  
Sherif H. El Tahry ◽  
Christopher Rutland ◽  
Joel Ferziger
Keyword(s):  
Numerical Study ◽  
Premixed Flames ◽  
Turbulent Premixed Flames ◽  
Turbulent Premixed
Sign in / Sign up

Export Citation Format

Share Document