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Closure Relations for Fluxes of Flame Surface Density and Scalar Dissipation Rate in Turbulent Premixed Flames

1
Department of Mechanics and Maritime Sciences, Chalmers University of Technology, 412 96 Gothenburg, Sweden
2
Department of Mechanical Engineering, Kagoshima University, Kagoshima 890-0065, Japan
3
Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan
*
Author to whom correspondence should be addressed.
Fluids 2019, 4(1), 43; https://doi.org/10.3390/fluids4010043
Received: 11 February 2019 / Revised: 26 February 2019 / Accepted: 4 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Numerical Simulations of Turbulent Combustion)
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Abstract

In this study, closure relations for total and turbulent convection fluxes of flame surface density and scalar dissipation rate were developed (i) by placing the focus of consideration on the flow velocity conditioned to the instantaneous flame within the mean flame brush and (ii) by considering the limiting behavior of this velocity at the leading and trailing edges of the flame brush. The model was tested against direct numerical simulation (DNS) data obtained from three statistically stationary, one-dimensional, planar, premixed turbulent flames associated with the flamelet regime of turbulent burning. While turbulent fluxes of flame surface density and scalar dissipation rate, obtained in the DNSs, showed the countergradient behavior, the model predicted the total fluxes reasonably well without using any tuning parameter. The model predictions were also compared with results computed using an alternative closure relation for the flame-conditioned velocity. View Full-Text
Keywords: turbulent flame; premixed turbulent combustion; countergradient transport; flame surface density; scalar dissipation rate; modeling; direct numerical simulations turbulent flame; premixed turbulent combustion; countergradient transport; flame surface density; scalar dissipation rate; modeling; direct numerical simulations
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MDPI and ACS Style

Lipatnikov, A.N.; Nishiki, S.; Hasegawa, T. Closure Relations for Fluxes of Flame Surface Density and Scalar Dissipation Rate in Turbulent Premixed Flames. Fluids 2019, 4, 43.

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