CFD simulations of premixed hydrogen combustion using the Eddy Dissipation and the Turbulent Flame Closure models

Abstract

This paper presents a CFD simulation of premixed combustion tests, and centers around a comparison between the classical Eddy Dissipation Model (EDM) and the more sophisticated Turbulent Flame Closure (TFC) model. The chosen tests relate to hydrogen-air deflagration experiments in the THAI and ENACCEF facilities, featuring respectively slow and fast dynamics. Validation of the models is accomplished by comparing model predictions against important measured combustion parameters (flame velocity and spatial propagation, pressure history, spectra, etc.). We follow CFD Best Practice Guidelines, in particular by conducting systematic mesh and time-step sensitivity studies. Both default models predict combustion evolution reasonably well in all tests studied. For the ENACCEF dual compartment experiments, the flame propagation features several dynamical phases, and the TFC model using the progress variable approach reproduces better than the EDM the flame velocity evolution, which leads to better estimation of the temporal gradient of pressure. The better performance of the TFC model comes however at the expense of a larger computational effort, i.e. larger meshes and smaller time steps. This observed trend in 2D geometries is likely to be enhanced in 3D settings.

Simulation Study of Gas Explosion Propagation Law in Coal Mining Face With Different Ventilation Modes

“…The eddy current dissipation model, whose reaction rate is controlled by turbulent mixing, is used for nonpremixed flames. In combination with literature (Hassan et al, 2010;Halouane and Dehbi, 2017;Hoste et al, 2019;Chen et al, 2020;Tian, 2020), the ED eddy dissipation model, which is applied to the LES turbulence model is adopted for combustion model, and the simple algorithm is used for iterative solution with an iterative time step of 0.0005 s. The reliability of the turbulence and combustion model is verified below.…”

Numerical Simulation of the Process of Combustion of a Stoichiometric Hydrogen-Oxygen Mixture in a Steam Generator

“…The Euler-Euler multiphase model [34][35][36] was used to describe the motion of the twophase flow in the steam generator flow part. The principal model equations are given below: The Eddy Dissipation Model (EDM) [37,38] was used for describing the combustion process: , The description of the complex heat transfer between the gas, flame and walls in the paper accounts for radiant heat transfer by using the P1 model [29,33,38]. The equation of the P1 radiant heat transfer model has the form:…”

RANS- and TFC-Based Simulation of Turbulent Combustion in a Small-Scale Venting Chamber

“…Modelling using RANS and TFC approaches has been validated in the literature for a number of different cases-flame interaction with obstacle-induced turbulence [14][15][16][17]25,26], fan-stirred explosion bomb [27], slow deflagrations [28], upwards hydrogen flame propagation in larger closed volume [29], combustion in pipelines [30] and fan-stirred combustion vessel [31].…”

“…In relation to obstacle-driven turbulent flame acceleration, the RANS method suitability has been demonstrated in a number of cases. For example, in several works by different authors [14][15][16][17], numerical simulations of hydrogen flame propagation in a large-scale facility-ENACCEF acceleration tube-was performed employing URANS, and turbulent flame speed closure approaches with varying but generally satisfactory accuracy. In [18], URANS based simulations were used to investigate the deflagration to detonation transition (DDT) process in a channel with arc obstacles.…”