Viscous superlayer in a reacting compressible turbulent mixing layer

Direct numerical simulations of temporally evolving reacting compressible mixing layers have been performed to study the viscous superlayer (VSL) at the outer edge of the interface layer. Budgets of the transport equation of enstrophy conditioned on the normal distance from the turbulent/non-turbule...

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Bibliographic Details
Published in:Journal of fluid mechanics 2018-08, Vol.848, p.743-755
Main Authors: Jahanbakhshi, Reza, Madnia, Cyrus K.
Format: Article
Language:English
Subjects:
Compressibility
Computational fluid dynamics
Computer simulation
Conditioning
Correlation coefficient
Correlation coefficients
Enstrophy
Entrainment
Fluid mechanics
Heat transfer
JFM Papers
Mixing layers (fluids)
Propagation
Simulation
Thickness
Turbulent mixing
Velocity
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Summary:Direct numerical simulations of temporally evolving reacting compressible mixing layers have been performed to study the viscous superlayer (VSL) at the outer edge of the interface layer. Budgets of the transport equation of enstrophy conditioned on the normal distance from the turbulent/non-turbulent interface are used to examine the features of the VSL. A new method is introduced to detect and to quantify the thickness of the VSL in reacting compressible flows. It involves finding the correlation coefficient of the viscous diffusion term with the viscous dissipation term. It is shown that, while compressibility seems to have little effect on the thickness of the VSL, as the level of heat release increases, the thickness of this layer decreases. Furthermore, it is observed that a thinner VSL propagates slower, resulting in a decrease of the rate of entrainment into the mixing layer.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2018.402