Multi-phase flows is simply any fluid flow system consisting of two or more distinct phases flowing simultaneously in a mixture with some level of phase separation at a scale well above the molecular level. A mixing layer is formed when two parallel streams of fluids are moving at different velocities such that the velocity at the fluid-fluid interface is non-zero. In the absence of dissipative forces such as viscosity, small perturbations at the fluid–fluid interface lead to the creation of vortices at the interface.For a particle-laden flow at this interface, these vortices will affect the flow of particles based on the particle mass. 
A particle-laden flow is a multiphase flow where one phase is the fluid and the other is dispersed particles. Governing equations for both phases are implemented in Ansys Fluent. This SimCafe Fluids Course was developed by Dr. Rajesh Bhaskaran, Swanson Director of Engineering Simulation at Cornell University and Chiyu Jiang in partnership with Ansys, and was last modified by Alumni Chiyu Jiang. It serves as an e-learning resource to integrate industry-standard simulation tools into courses and provides a resource for supplementary learning outside the classroom. In this tutorial, we will learn to model the 2D periodic double shear layer by following the end-to-end workflow in Ansys Workbench.
For more ways to learn, check out the Cornell edX course, A Hands-on Introduction to Engineering Simulations at ansys.com/cornell.
Cornell University also offers a Fluid Dynamics Simulations Using Ansys online certificate authored by Dr. Rajesh Bhaskaran. Learn more here: https://ecornell.cornell.edu/fluiddynamics
