2016
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Abstract: The isotropy of the smallest turbulent scales is investigated in premixed turbulent combustion by analyzing the vorticity vector in a series of high Karlovitz number premixed flame direct numerical simulations. It is found that increasing the Karlovitz number and the ratio of the integral length scale to the flame thickness both reduce the level of anisotropy. By analyzing the vorticity transport equation, it is determined that the vortex stretching term is primarily responsible for the development of any anis… Show more

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Cited by 20 publications
(9 citation statements)
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References 59 publications
(125 reference statements)
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“…A number of recent studies 23 29 investigated the Reynolds-averaged enstrophy transport equation in turbulent premixed flames by Reynolds-averaging eq. 4 : …”
Section: Introductionmentioning
confidence: 99%
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“…A number of recent studies 23 29 investigated the Reynolds-averaged enstrophy transport equation in turbulent premixed flames by Reynolds-averaging eq. 4 : …”
Section: Introductionmentioning
confidence: 99%
“… 30 demonstrated that the characteristic Lewis number significantly affects the vorticity generation within the flame, and a combination of augmented flame normal acceleration and high extent of flame wrinkling for small values of Lewis number may give rise to a significant amount of vorticity generation within the flame brush due to baroclinic torque. Bobbit and coworkers 28 , 29 demonstrated that the enstrophy transport in statistically planar flames propagating in homogeneous isotropic turbulence for large values of Karlovitz number is governed by the relative balance between the vortex-stretching and viscous dissipation similar to its non-reacting counterpart, and also revealed that the choice of chemical reaction mechanism does not affect the qualitative nature of the enstrophy transport. The enstrophy field in turbulent premixed flames using cinema- stereoscopic particle image velocimetry (PIV) measurements of rim-stabilised turbulent premixed flames has been investigated 32 34 and confirmed some of the observations based on DNS data.…”
Section: Introductionmentioning
confidence: 99%
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“…16,[20][21][22] Contrary to the aforementioned studies of the influence of heat release on the dissipation rate in the non-premixed mode of turbulent burning, the present authors are not aware on evaluation of the ratio v in premixed flames (note that such a flame is characterized by a significant spatial gradient of the mean flow velocity in the direction normal to the mean flame surface). Nevertheless, in a recent DNS study 24,25 of highly turbulent premixed flames, the influence of combustion-induced thermal expansion on small-scale turbulence was also attributed to the increase in the mixture viscosity.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, direct numerical simulations (DNS) have been used extensively to study enstrophy transport in the canonical configuration of flames embedded in boxes of low Mach number homogeneous isotropic turbulence (HIT) (Bobbitt & Blanquart 2016; Bobbitt, Lapointe & Blanquart 2016; Chakraborty, Konstantinou & Lipatnikov 2016; Dopazo, Cifuentes & Chakraborty 2017; Papapostolou et al. 2017).…”
Section: Introductionmentioning
confidence: 99%