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We study the effect of thermal noise on the propagation speed of a planarflame. We show that this out of equilibrium greatly amplifies the effect ofthermal noise to yield macroscopic reductions in the flame speed over what ispredicted by the noise-free model. Computations show that noise slows the flamesignificantly. The flame is modeled using Navier Stokes equations withappropriate diffusive transport terms and chemical kinetic mechanism ofhydrogen/oxygen. Thermal noise is modeled within the continuum framework usinga system of stochastic partial differential equations, with transport noisefrom fluctuating hydrodynamics and reaction noise from a poisson model. We usea full chemical kinetics model in order to get quantitatively meaningfulresults. We compute steady and dynamic flames using an operator split finitevolume scheme. New characteristic boundary conditions avoid non-physicalboundary layers at computational boundaries. New limiters prevent stochasticterms from introducing non-physical negative concentrations. This representsthe first computation of a model with thermal noise is a system with thisdegree of physical detail.

The Effect of Noise on the Propagating Speed of Pre-mixed Laminar Flame Fronts