Développement de la Méthode de Simulation Aux Grandes Échelles Pour Les Écoulements Diphasiques Turbulents

Download or read book Développement de la Méthode de Simulation Aux Grandes Échelles Pour Les Écoulements Diphasiques Turbulents written by Eleonore Riber and published by . This book was released on 2007 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work deals with numerical modeling of turbulent two-phase flows. It focuses on the phenomena of dispersion and preferential concentration of solid particles in a gas flow, and proposes a LES formulation of the eulerian mesoscopic approach, which raises two main issues. First, the set of equations for the dispersed phase that is non diffusive creates strong gradients difficult to handle numerically. Then, the unclosed terms are due both to ensemble averaging and volume filtering. In the presence study, a new numerical method more adapted to the dispersed phase equations is first proposed. Second, its robustness and accuracy are shown performing DNS of particle-laden decaying HIT flow. Finally, the LES eulerian mesoscopic model that was a priori proposed by Moreau (2006) is a posteriori validated in two complex geometries (Hishida et al. (1987) and Borée et al. (2001)) through comparisons with measurements and lagrangian results.