DISPERSION OF PARTICLES IN ANISOTROPIC TURBULENT FLOWS

A Lagrangian approach is used to simulate particle dispersion in anisotropic turbulent flows. Discrete particles are tracked in three dimensions, influenced by the fluid's turbulent velocity fluctuations. The fluctuations are temporally and directionally correlated through a statistical sampling method reflecting the anisotropy of the flow field. They are calculated at the discrete particle's position through a spatial correlation which takes into consideration the anisotropy of the Reynolds stresses. The method is first tested as to the performance of the temporal and directional correlation features and is then combined with a Eulerian scheme and an algebraic Reynolds stress model for the prediction of the carrier phase. The final form of the model is used to predict a two-phase turbulent round jet and a two-phase inert flow from a quarl burner, with swirl. In parallel to these, the method is compared to a previous particle-tracking method based on an isotropic hypothesis.