An assessment of large eddy simulations of premixed flames propagating past repeated obstacles

Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles

“…A grid resolution of 90x90x336 (2.7 million cells) is adopted in the present calculations, as further refinement to 3.6 million cells shows no significant improvement in the results [19] for the present configuration. The filter width  is calculated using a box filter, which is generally …”

“…The governing equations and other numerical details associated with the LES model adopted in this paper are detailed elsewhere [18][19][20] and only a brief description is given here. A grid resolution of 90x90x336 (2.7 million cells) is adopted in the present calculations, as further refinement to 3.6 million cells shows no significant improvement in the results [19] for the present configuration.…”

“…Earlier studies [20,21] using the same DFSD model showed promising results in computing key characteristics of the propagating turbulent premixed flames but with only three selected configurations. In the present study, the main focus is to analyse the physics associated with flame-solids interactions and extend the calculations to a wide range of configurations to explore aspects such as the effects of location and number of the solid obstacles as well as area blockage ratio.…”

“…In this paper the LES approach is used together with a recently developed dynamic flame surface density (DFSD) model [18][19][20] to compute turbulent premixed flames propagating in a laboratory scale combustion chamber containing a range of built-in solid obstructions.…”

Large eddy simulation of hydrogen–air premixed flames in a small scale combustion chamber

“…The numerical model described above, has been employed using a modified in-house LES code [51,53] with a grid resolution of 90 Â 90 Â 336 (2.7 million) cells in 3 dimensional space (Fig. 1b) where it should be noticed that any further grid refinement beyond this grid has no significant impact on the results [48,54].…”