Modeling and Large Eddy Simulation of Deflagration Dynamics in a Closed Vessel

The paper describes a large eddy simulation model of gaseous deflagration in a closed vessel and simulation results for stoichiometric hydrogen–air premixed combustion initiated at the center of a closed 6.37m³ spherical vessel. The model is based on the large eddy simulation approach to turbulence modeling and the gradient method to model the mass burning rate in premixed combustion. The method for simulated flamefront thickness reduction is suggested, and its performance is investigated. The solutionadaptive mesh refinement is used to decrease the CPU time required for simulation. The simulated deflagrationpressure dynamics is in agreement with published experimental data, and the flamefront velocity is in agreement with simulation results obtained according to the lumped parameter model for the same experiment.