Rodney Fox (Iowa State University, USA) - A Kinetic-Based, Multiscale Eulerian Model for Polydisperse Multiphase Flows

Polydisperse multiphase flows arise in many applications, and almost always involve a disperse phase with particles of different sizes, compositions, etc., present over a wide range for volume fractions. In this seminar, I will review recent advances in using kinetic-based moment methods to develop well-posed Eulerian two-fluid models.  This approach relies on formulating a disperse-phase kinetic equation valid from close-packed to dilute conditions, coupled to a modified Navier-Stokes equation for the continuous phase. Through numerical examples, I will demonstrate that by including added mass and particle-fluid-particle stresses, this modeling approach is well posed for polydisperse flows with arbitrary material density ratios (e.g., bubbly flows and gas-solid flows).