Scalar gradient and strain rate statistics in oblique premixed flame–wall interaction within turbulent channel flows

U Ahmed, N Chakraborty, M Klein - Flow, Turbulence and Combustion, 2021 - Springer
Three-dimensional direct numerical simulations of V-flames interacting with chemically inert
walls in a fully developed turbulent channel flow have been performed under adiabatic and …

Insights into the bending effect in premixed turbulent combustion using the flame surface density transport

U Ahmed, N Chakraborty, M Klein - Combustion Science and …, 2019 - Taylor & Francis
The bending effect of turbulent flame speed variation (ie, the deviation from the linear
increase of flame speed with increasing root-mean-square turbulent velocity fluctuation) has …

Statistical behavior of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed combustion

U Ahmed, AL Pillai, N Chakraborty, R Kurose - Physical Review Fluids, 2019 - APS
A direct numerical simulation (DNS) database for boundary layer flashback of a premixed
hydrogen-air flame with an equivalence ratio of 1.5 in a fully developed turbulent channel …

Surface density function evolution and the influence of strain rates during turbulent boundary layer flashback of hydrogen-rich premixed combustion

U Ahmed, AL Pillai, N Chakraborty, R Kurose - Physics of Fluids, 2020 - pubs.aip.org
The statistical behavior of the magnitude of the reaction progress variable gradient
[alternatively known as the surface density function (SDF)] and the strain rates, which govern …

Analysis of the Evolution of the Surface Density Function During Premixed V-Shaped Flame–Wall Interaction in a Turbulent Channel Flow at Reτ = 395

R Kai, AL Pillai, U Ahmed, N Chakraborty… - Combustion Science …, 2022 - Taylor & Francis
The flame–turbulence interaction and statistical behavior of the surface density function
(SDF; ie magnitude of the reaction progress variable gradient) in the vicinity of the wall for a …

Scalar transport and the validity of Damköhler's hypotheses for flame propagation in intense turbulence

GV Nivarti, RS Cant - Physics of fluids, 2017 - pubs.aip.org
The turbulent burning velocity of premixed flames is sensitive to the turbulence intensity of
the unburned mixture. Premixed flame propagation models that incorporate these effects of …

Evolutions of strain rate and dissipation rate of kinetic energy in turbulent premixed flames

N Chakraborty, C Kasten, U Ahmed, M Klein - Physics of Fluids, 2021 - pubs.aip.org
The statistical behaviors of the evolutions of the components of the strain rate tensor and
Favre-averaged dissipation rate of kinetic energy are analyzed using direct numerical …

Effects of fuel Lewis number on the near-wall dynamics for statistically planar turbulent premixed flames impinging on inert cold walls

I Konstantinou, U Ahmed… - Combustion Science and …, 2021 - Taylor & Francis
The flame-wall interaction in a quasi-steady configuration, where a statistically planar
premixed flame is pushed by the inflow of unburned reactants and stabilizes at a distance …

Modelling flame turbulence interaction in RANS simulation of premixed turbulent combustion

U Ahmed, R Prosser - Combustion Theory and Modelling, 2016 - Taylor & Francis
Flame turbulence interaction is an important term for modelling scalar dissipation in
premixed turbulent combustion. In order to obtain an accurate representation of the flame …

On the stress-strain alignment in premixed turbulent flames

U Ahmed, N Chakraborty, M Klein - Scientific reports, 2019 - nature.com
The interaction of large and small scale structures is fundamental to the energy cascade in
turbulent flows. The correct representation of this interaction becomes important in the …