Statistical Eulerian diffusion approach offour-way-coupled multiphase systems

摘要

Volume-fraction weighted and Reynolds averaged momentum transport equationsare solved in an Euler/Euler approach to simulate numerically the turbulent, dispersed two-phase flow in a two-dimensional channel and a three-dimensional conic diffuser flow. Particularattention is given to the modelling of turbulent diffusion and particle wall interaction, assuminglocal equilibrium but introducing individual terms for particle/fluid drag interaction, particlecollisions and trajectory crossings. These influences have been quantified in terms of partialviscosities, a restitution power and a turbulence structure parameter. Boussinesq approxima-tions have been used for each phase and their interaction, whose formulation was provided inthe framework of the eddy-viscosity modelling concept.