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

摘要

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.View full textDownload full textKeywordsLagrangian approach, Langevin model, Large eddy simulation, Reactive scalar, Turbulent particle dispersionRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00986445.2011.591216