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Particle dispersion modelling based on the Generalised Langevin Model for the seen velocity

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.910
pages 853-862

Bertrand Naud
Modeling and Numerical Simulation Group, Energy Dept., Ciemat, Avda. Complutense 22, 28040 Madrid, Spain

Sinopsis

In the context of RANS and joint velocity-scalar probability density function (PDF) modelling of single-phase turbulent flows, we recently studied the relation between the Generalised LangevinModel (GLM) and scalar-flux modelling [1, 2]. In the present work, we extend these findings to the modelling of particle dispersion based on a Langevin model for the seen velocity [3, 4]. The new seen-velocity GLM dispersion model is validated on a polydispersed two-phase flow downstreamof a confined bluff body, and the advantages of the new formulation are illustrated by considering the dispersion of tracer particles in a highly turbulent recirculating flow. In case the seen-velocity SLM is used, a modification of the constant C0 is recommended in order to impose the Monin constant value CØ1 = 3 for the linear relaxation of the implied scalar flux model.

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