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

Sub-grid scale combustion models for large eddy simulation of unsteady premixed flame propagation around obstacles

“…However, it is still unclear whether they are fit for transient combustion phenomena such as explosions. All LES models proposed for premixed flame deflagration in the presence of obstacles are based on the FSD approach [19][20][21][22][23][24]. It has been shown that the identification of the combustion regimes through which the flame propagation evolves (ranging from the laminar regime up to the thin reaction zones regime) is consistent with the flamelet assumption on which such an approach relies [20,22].…”

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

“…Recently, Di Sarli and co workers [13,14] demonstrated the importance of FSD based SGS model [1] to predict explosions in a vented chamber using LES. SGS modelling approaches that are seen as alternatives to flamelets include the filtered density functions (FDF) [15], the conditional moment closure [16] and the linear eddy model (LEM) [17].…”

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

“…The approaches based on FSD are more reasonable in terms of computational cost yet well recognized in accounting for chemical reactions in the context of LES [31,32] with reaction rate being modelled as a function of the reaction progress variable and filter width. Recently, Di Sarli et al [33,34] showed the importance of FSD based SGS models [17] to predict deflagrations in a vented chamber using LES. Other SGS models that are seen as alternatives to flamelets include the filtered density functions (FDF) [35], and probability density function approaches (pdf-like methods) which include transported pdf [36,37], multiple mapping conditioning (MMC) [38,39], the conditional moment closure [40,41], the linear Eddy model (LEM) [42e44], the renormalization group (RNG) [7,45].…”