CMX Lunch Seminar

Wednesday April 21, 2021 12:00 PM

The mechanics of finite-time blowup in an Euler flow

Speaker: Dwight Barkley, Mathematics Institute, University of Warwick
Location: Online Event

The mechanism for singularity formation in an inviscid wall-bounded fluid flow is investigated. The incompressible Euler equations are numerically simulated in a cylindrical container. The flow is axisymmetric with swirl. The simulations reproduce and corroborate aspects of prior studies by Luo and Hou reporting strong evidence for a finite-time singularity. The analysis here focuses on the interplay between inertia and pressure, rather than on vorticity. Linearity of the pressure Poisson equation is exploited to decompose the pressure field into independent contributions arising from the meridional flow and from the swirl, and enforcing incompressibility and enforcing flow confinement. The key pressure field driving the blowup of velocity gradients is that confining the fluid within the cylinder walls. A model is presented based on a primitive-variables formulation of the Euler equations on the cylinder wall, with closure coming from how pressure is determined from velocity. The model captures key features in the mechanics of the blowup scenario.   

Series CMX Lunch Series

Contact: Jolene Brink at 6263952813 jbrink@caltech.edu
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