Lagrangian Particle Tracking for Modeling of Multiphase Flows
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The Symposium provides undergraduates from all academic disciplines with an opportunity to share their research with the university community and other guests through conference-style oral presentations. The Symposium represents part of a larger effort of Iowa State University to enhance, support, and celebrate undergraduate research activity.
Though coordinated by the University Honors Program, all undergraduate students are eligible and encouraged to participate in the Symposium. Undergraduates conducting research but not yet ready to present their work are encouraged to attend the Symposium to learn about the presentation process and students not currently involved in research are encouraged to attend the Symposium to learn about the broad range of undergraduate research activities that are taking place at ISU.
The first Symposium was held in April 2007. The 39 students who presented research and their mentors collectively represented all of ISU's Colleges: Agriculture and Life Sciences, Business, Design, Engineering, Human Sciences, Liberal Arts and Sciences, Veterinary Medicine, and the Graduate College. The event has grown to regularly include more than 100 students presenting on topics that span the broad range of disciplines studied at ISU.
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Compressible multiphase flows occur in a variety of engineering applications and have been an active area of research for decades. Models have been developed for both dilute and granular multiphase flows, but the regime between these states is not as well understood. We have developed a Lagrangian particle tracking methodology that studies this intermediate regime. Position and velocity are computed for spherical particles as a function of time while handling any collisions between them. Collisions are treated using a hard sphere model, where collisions are modeled as instantaneous impulsive forces. Energy losses are accounted for through restitution and friction coefficients. The particles are allowed to be mixed sizes and are not restricted to equal external accelerations. The results are validated by ensuring conservation of energy and momentum. This approach will be integrated with a computational fluid dynamics (CFD) solver to allow full two-way coupling between the solid and fluid phases. This will enable highly detailed studies of multiphase flows in the complex regime between dilute and granular flows.