Enstrophy transport conditional on local flow topologies in different regimes of premixed turbulent combustion

Vassilios Papapostolou, Daniel H. Wacks, Nilanjan Chakraborty, Markus Klein, Hong G. Im

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Enstrophy is an intrinsic feature of turbulent flows, and its transport properties are essential for the understanding of premixed flame-turbulence interaction. The interrelation between the enstrophy transport and flow topologies, which can be assigned to eight categories based on the three invariants of the velocity-gradient tensor, has been analysed here. The enstrophy transport conditional on flow topologies in turbulent premixed flames has been analysed using a Direct Numerical Simulation database representing the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) combustion regimes. The flame in the CF regime exhibits considerable flame-generated enstrophy, and the dilatation rate and baroclinic torque contributions to the enstrophy transport act as leading order sink and source terms, respectively. Consequently, flow topologies associated with positive dilatation rate values, contribute significantly to the enstrophy transport in the CF regime. By contrast, enstrophy decreases from the unburned to the burned gas side for the cases representing the TRZ and BRZ regimes, with diminishing influences of dilatation rate and baroclinic torque. The enstrophy transport in the TRZ and BRZ regimes is governed by the vortex-stretching and viscous dissipation contributions, similar to non-reacting flows, and topologies existing for all values of dilatation rate remain significant contributors.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Sep 11 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: N.C. and D.H.W. are grateful to EPSRC and N8/ARCHER. HGI was sponsored by KAUST and made use of the resources of the KAUST Supercomputing Laboratory and computer clusters.


Dive into the research topics of 'Enstrophy transport conditional on local flow topologies in different regimes of premixed turbulent combustion'. Together they form a unique fingerprint.

Cite this