Simulations of Diffusion-Reaction Equations with Implications to Turbulent Combustion Modeling
INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA
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An enhanced diffusion-reaction reaction system DRS is proposed as a statistical model for the evolution of multiple scalars undergoing mixing and reaction in an isotropic turbulence field. The DRS model is close enough to the scalar equations in a reacting flow that other statistical models of turbulent mixing that decouple the velocity field from scalar mixing and reaction e.g. mapping closure model, assumed-pdf models cannot distinguish the model equations from the original equations. Numerical simulations of DRS are performed for three scalars evolving from non-premixed initial conditions. A simple one-step reversible reaction is considered. The data from the simulations are used 1 to study the effect of chemical conversion on the evolution of scalar statistics, and 2 to evaluate other models mapping-closure model, assumed multivariate beta-pdf model. Turbulent combustion modeling, Scalar mixing, Mixingreaction.
- Fluid Mechanics
- Combustion and Ignition