HYBRID LARGE EDDY SIMULATION/LAGRANGIAN STOCHASTIC MODEL FOR TURBULENT PASSIVE AND REACTIVE SCALAR DISPERSION IN A PLANE JET

A hybrid large eddy simulation (LES)-Lagrangian model is tested by computing passive and reactive scalar dispersion in inhomogeneous turbulent flows. Fluid particles are tracked in a Lagrangian way. In order to obtain the subgrid scale velocity component of fluid particles, a Lagrangian stochastic s...

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Published inChemical engineering communications Vol. 199; no. 4; pp. 435 - 460
Main Authors Le Ribault, C., Simoëns, S., Vinkovic, I.
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis Group 01.04.2012
Taylor & Francis Ltd
Taylor & Francis
Subjects
Chemical reactions
Computational fluid dynamics
Dispersion
Dispersions
Engineering Sciences
Fluid flow
Fluids
Fluids mechanics
Lagrangian approach
Langevin model
Large eddy simulation
Mechanics
Reactive scalar
Scalars
Simulation
Turbulence
Turbulent flow
Turbulent particle dispersion
Velocity
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Summary:A hybrid large eddy simulation (LES)-Lagrangian model is tested by computing passive and reactive scalar dispersion in inhomogeneous turbulent flows. Fluid particles are tracked in a Lagrangian way. In order to obtain the subgrid scale velocity component of fluid particles, a Lagrangian stochastic subgrid model is coupled at the subgrid scale level with the Eulerian LES. An additional pairing exchange model is used to take into account molecular diffusion. A second-order irreversible chemical reaction is considered to take place within each fluid particle. Validation is achieved by comparing the mixture fraction that behaves as a passive scalar to a passive scalar simulation. The results of the LES/Lagrangian modeling are compared with experimental results and with pure Eulerian LES where a passive scalar transport equation is solved. The objective of the work is to test the model and its ability to reproduce inhomogeneous reactive cases.
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ISSN:0098-6445
1563-5201
DOI:10.1080/00986445.2011.591216