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Lookup NU author(s): Dr Sanjeev GhaiORCiD, Dr Umair AhmedORCiD, Professor Nilanjan ChakrabortyORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Author(s) 2025. The influence of fuel Lewis number LeF on the wall-normal variations of mean values of streamwise velocity component, temperature, and Reynolds stresses within turbulent boundary layers have been analysed using a Direct Numerical Simulation (DNS) database of oblique wall quenching of V-shaped premixed flames due to their interaction with inert isothermal walls in a turbulent channel flow configuration. The fuel Lewis numbers of LeF = 0.6, 1.0 and 1.4 have been considered for the current analysis. It has been found that the flame starts to interact with the wall further upstream for a smaller value of LeF due to an augmentation of the volume-integrated burning rate with a decrease in fuel Lewis number. The thermal expansion induced by heat release affects the variations of mean values of both streamwise velocity component and temperature in the wall-normal direction and they show significant deviations from the conventional log-law profiles. Recently proposed density-compensated modified wall functions for streamwise velocity and non-dimensional temperature, which were previously validated for head-on quenching configuration for unity Lewis number, are found to capture the corresponding behaviours extracted from DNS data for flame-wall interaction of V-shaped flames with non-unity LeF. The wall-normal distributions of Reynolds stresses also deviate significantly from the corresponding non-reacting fully developed channel flow profiles during flame-wall interaction and LeF affects the extent of this deviation. The anisotropy of Reynolds stresses has been found to increase with the progress of flame-wall interaction. The physical explanations for the observed mean velocity, mean temperature and Reynolds stress statistics have been provided and their implications for modelling of flame-wall interaction have been elaborated.
Author(s): Ghai SK, Ahmed U, Chakraborty N
Publication type: Article
Publication status: Published
Journal: Flow, Turbulence and Combustion
Year: 2026
Volume: 116
Print publication date: 01/01/2026
Online publication date: 10/12/2025
Acceptance date: 30/09/2025
Date deposited: 22/12/2025
ISSN (print): 1386-6184
ISSN (electronic): 1573-1987
Publisher: Springer Nature
URL: https://doi.org/10.1007/s10494-025-00709-9
DOI: 10.1007/s10494-025-00709-9
Data Access Statement: The datasets used and/or analysed during the current study available from the corresponding author on reasonable request.
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