Large Eddy Simulation (2D) of a Reacting Plane Mixing Layer Using Filtered Density Function Closure |
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Authors: | XY Zhou JCF Pereira |
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Institution: | (1) Departamento de Engenharia Mecanica, Instituto Superior Técnico, Av. Rovisco Pais, 1096 Lisboa codex, Portugal |
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Abstract: | The filtered density function (FDF) is implemented for a two-dimensional, large eddy simulation (LES) of a gas phase, spatially
developing, reacting and non-reacting, constant-density, plane mixing layer in a flow regime prior to the mixing transition
where the flow is mainly two-dimensional. The unresolved scalar fluctuations are taken into account by considering the probability
density function (PDF) of subgrid scale (SGS) scalar quantities following the FDF approach. In the derived FDF transport equation,
the effect of chemical reactions appears in a closed form. The Lagrangian Monte Carlo scheme is used to solve the FDF transport
equation. The applicability and performance of the FDF for LES of a reacting plane mixing layer are assessed by comparisons
with experimental measurements. In non-reacting flow, the calculated mean streamwise velocity profiles and mean mixture fraction
profiles relax to self-similarity, which is in satisfactory agreement with the measurements. In reacting flow, the FDF calculation
provided a satisfactory accuracy in comparison with measurements of mean reactant and product concentration. The increase
in the total amount of product formation in the flip case demonstrates the asymmetric characteristics of the entrainment and
mixing characteristics in the mixing layer.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | filtered density function large eddy simulation mixing layer reaction |
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