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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Implementation of the Flamelet-Generated-Manifold (FGM) for premixed turbulent flames
Submission Author:
Andre Carlos Contini , RS , Brazil
Co-Authors:
Andre Carlos Contini, Leonardo Zimmer, Cristian Alex Hoerlle, Lisandro Maders, Fernando Pereira
Presenter: Lisandro Maders
doi://10.26678/ABCM.COBEM2017.COB17-1601
Abstract
It is known that turbulent flows are computationally costly when performing numerical simulations. Adding combustion physics to the flow drastically increases the computational cost, which makes the use of modeling approaches mandatory. In the literature, different approaches have already been reported to solve turbulent flames with reasonable computational time. In the present study, a premixed flame (CH4/air, phi = 0.9) in an adiabatic single jet 3D geometry is simulated. Combustion is modeled through the Flamelet-Generated-Manifold (FGM) technique, which solves a set of one-dimensional flames (flamelets) using detailed chemical kinetics and tabulates the results through control variables which must describe the physics of the multidimensional problem. For turbulent flows, the mean values of chemical terms are modeled assuming that a variable is described locally by a presumed Beta Probability-Density-Function (beta-PDF), while the variance is solved using an algebraic equation. The result is a two-dimensional database, whose control variables are the variance and a progress variable. The turbulent flow is coupled with the database and solved in a stationary regime. The preliminary results have been compared to other works of literature and the FGM has been presenting satisfactory results.
Keywords
FGM, mathematical modeling, Turbulence, Combustion Process
