University of Minnesota
Aerospace Engineering and Mechanics
Fall 1999 Seminar Series



Modeling of some fundamental aspects of particulate flows


Professor S. Balachandar

Department of Theoretical & Applied Mechanics, University of Illinois, Urbana-Champaign


Abstract


This talk will outline some of the fundamental research activities in particulate/droplet flow modeling that are on going at the Center for Simulation of Advanced Rockets. Results from three different efforts will be highlighted. Direct numerical simulations of flow and heat transfer over an isolated particle/droplet is performed in the Reynolds number range 10 to 500, in order to better understand the influence of both unsteadiness and flow non-uniformity on forces and thermal transfer. A general force law for particle motion which accounts for arbitrary linear variation in the surrounding flow is proposed. Even modest straining motion in the external flow is observed to influence the drag and lift forces strongly. The effective added mass coefficient measured from the quasi-steady and rapidly varying flows at finite Re does not seem to agree with the standard result based on potential flow. A companion study of particles of different sizes in a turbulent channel flow investigates the importance of surrounding flow non-uniformity on the lift and drag forces experienced by the particles. This study also addresses the possibility of an Eulerian representation of the particulate motion in the limit of reasonable small particles.

Friday, December 3, 1999
209 Akerman Hall
2:30-3:30 p.m.


Refreshments served after the seminar in 227 Akerman Hall.
Disability accomodations provided upon request.
Contact Kristal Belisle, Senior Secretary, 625-8000.