A note on the consistency of Hybrid Eulerian/Lagrangian approach to multiphase flows

Abstract

The aim of the present paper is to introduce and to discuss inconsistencies errors that may arise when Eulerian and Lagrangian models are coupled for the simulations of turbulent poly-dispersed two-phase flows. In these hydrid models, two turbulence models are in fact implicitely used at the same time and it is essential to check that they are consistent, in spite of their apparent different formulations. This issue appears in particular in the case of very-small particles, or tracer-limit particles, and it is shown that coupling inconsistent turbulence models (Eulerian and Lagrangian) can result in non-physical results, notably for second-order fluid velocity moments. This problem is illustrated by some computations for fluid particles in a turbulent channel flow using several coupling strategies.

14 pages, 3 figures

References in corpus (2)

• PDF model based on Langevin equation for polydispersed two-phase flows applied to a bluff-body gas-solid flow,
• Langevin PDF simulation of particle deposition in a turbulent pipe flow

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• A Lagrangian probability-density-function model for collisional turbulent fluid-particle flows. I. Model derivation
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• Analysis of wall-modelled particle/mesh PDF methods for turbulent parietal flows