(537e) Implementation of a Two-Fluid Eulerian-Eulerian Modeling Approach for Particle Transport and Deposition in Different Case Studies

Authors: 
Walters, D. K., Mississippi State University
Walters, K. B., Mississippi State University
Vasquez, E. S., Mississippi State University

A unified two-fluid Eulerian-Eulerian modeling approach is evaluated for the analysis of particle transport and deposition in several different case studies for a wide range of particle sizes and flow conditions.  Two canonical laminar test cases used for validation include a circular tube with a 90o bend (elbow) and a physiological realistic bifurcation (PRB) geometry.  Turbulent cases include simulation of particle deposition patterns for particulate matter (PM) on engine/exhaust devices.  Simulations are conducted using the commercial computational fluid dynamics (CFD) software Ansys FLUENT v.14, and the two-fluid Eulerian-Eulerian approach is implemented via user defined function (UDF) subroutines developed by the authors.  Hybrid mesh topologies (tetrahedral/hexahedral cells) are utilized in order to maintain resolution of near-wall boundary layer regions within an unstructured mesh framework. Results are analyzed in terms of primary and particle phase velocity distribution, particle phase volume fraction profiles, and particle deposition profiles. Results indicate that the two-fluid Eulerian-Eulerian modeling approach is viable for two-phase dilute mixtures for particle sizes ranging from the nanoscale to several microns.