Date of Award
Master of Science (MS)
College of Science and Mathematics
Thesis Sponsor/Dissertation Chair/Project Chair
Lagrange equations, Inertia (Mechanics), Fluid dynamics
Lagrangian Coherent Structures (LCS) provide a skeleton for the underlying structures in geophysical flows. It is known that LCS govern the movement of fluid particles within a flow, but it is not well understood how these same LCS influence the movement of inertial particles within a fluid flow. In this thesis, we consider two geophysical flows, the double-gyre model, and a single-layer quasi-geostrophic PDE model. In particular, we use finite-time Lyapunov exponents (FTLE) to characterize the attracting and repelling LCS for these models and show how inertial particles aggregate with respect to LCS. We numerically investigate the dynamics of inertial particles for a range of Stokes numbers and density ratios. We also examine the effects of Coriolis force on the preferential aggregation of inertial particles in the double-gyre model. Additionally, we highlight the funneling behavior of inertial particles due to the western boundary effect that arises in the quasi-geostrophic model.
Aucoin, Alexa, "Inertial Particle Transport by Lagrangian Coherent Structures in Geophysical Flows" (2018). Theses, Dissertations and Culminating Projects. 119.