In this Sustainable Energy Seminar, Jennifer Franck, Assistant Professor of Engineering Physics, will discuss research into unsteady fluid flows using computational tools. By gaining a better understanding of the flow physics, the goal is to harness these fundamental principles to help improve the performance of renewable energy systems such as wind or wave turbines.

Abstract:

This presentation will introduce state-of-the-art fluid mechanics modelling efforts behind two systems: 1) an oscillating foil for marine hydrokinetic energy, 2) an H-Darrieus turbine design for wind and hydrokinetic energy.   Oscillating foils offer an alternative to the more common rotation-based turbine design, with lower tip speeds and less entanglement, and thus more environmentally friendly to local flora and fauna.  Another advantage of the oscillating motion is the coherent and structured downstream wake comprised of alternating vortices.  Inspired by fish schooling or birds flying in a V-formation, these vortices can be manipulated to enhance the energy of downstream foils when placed in optimal array configurations.  Likewise, the H-Darrieus system will also shed energy-packed vortices during its rotational cycle. Modeling efforts will be discussed that are able to arrange such turbines to constructively interact with one another, and also how to optimize the timing of the vortex for optimal power production.