Theory, Modeling and Computation of Gas Explosion Phenomena

Abstract

This chapter focuses on computational fluid dynamics (CFD) modeling for gas explosions. Recent results obtained at both laboratory and industrial scales are reviewed. It is pointed out the central role of large eddy simulation (LES) as the most adequate tool for describing the inherently unsteady interplay of flame propagation, flow field, and geometry underlying explosion phenomena. Modeling, numerical, and computational issues yet to be afforded are discussed as relevant to realize fully the potential of explosion LES.

CFD Analysis of the Combustion of Hydrogen Fuel on a CFM56-3 Combustor

“…However, currently, the computational capabilities still remain favorable to RANS especially in the industrial context. This is in line with the conclusions taken by A. Benedetto and V. Sarli [59] in their comprehensive study about the theory, modeling and computation of gas explosion phenomena.…”

“…For the current computational capacities, direct numerical simulations of turbulent flows remain practical only for very simple geometries, involving low Reynolds numbers [57,59,111,112].…”

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

“…Modeling premixed flame propagation in gas explosions is a difficult task given that explosions are intrinsically unsteady phenomena, with flames transiting through different combustion regimes [1,2].…”

Sensitivity to the Presence of the Combustion Submodel for Large Eddy Simulation of Transient Premixed Flame–Vortex Interactions

“…In order to understand and control the hazards and risks associated with gas and vapor cloud explosions, predictive computational fluid dynamics (CFD) models are required …”

“…1 In order to understand and control the hazards and risks associated with gas and vapor cloud explosions, predictive computational fluid dynamics (CFD) models are required. 2 Over the past decade, the rapid increase in computing power has led to considerable progress in the development of CFD techniques based on large eddy simulation (LES) for modeling turbulent reacting flows. LES is replacing classical (and less computationally demanding) methods based on Reynolds averaging (i.e., RANS methods) for its ability to provide a better representation of turbulence and, thus, the resulting flameÀ turbulence interaction.…”