LES Modeling of Premixed Deflagrating Flames in a Small-Scale Vented Explosion Chamber with a Series of Solid Obstructions

Using Large Eddy Simulation for understanding vented gas explosions in the presence of obstacles

“…Most of the models are based on the URANS approach [5][6][7][8][9][10][11][12]. The Large Eddy Simulation (LES) technique has also been adopted, showing its ability to give more reliable predictions than URANS [13][14][15][16]. Recently, we have developed an LES model to simulate the unsteady flame propagation around three repeated obstacles in a laboratory-scale combustion chamber closed at one end [16].…”

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

“…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.…”

“…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 Premixed Combustion in Spark Ignited Engines Using a Dynamic Flame Surface Density Model

“…Another promising approach is to solve a transport equation for the wrinkling factor as in [43]. Alternatively, the SGS contribution of FSD can be explicitly calculated from the resolved quantities [44][45][46][47].…”

“…Current approach is particularly attractive because of less computational time involved whereas, it needs a significant time to evaluate gradients particularly in unstructured grids. The inner cut off scale is taken here as three times the thermal flame thickness following [22,[44][45][46][47].…”