Friday, 22 November, 2013
SPEAKER: Prof. Harbir Antil, George Mason University
TITLE: "Optimal Control of Free Boundary Problems with Surface Tension Effects"
ABSTRACT: Over the last decade, phenomenon like polymer extrusion has led to advancements in manufacturing of polymer products. Special fluids like ferrofluids have further technologically revolutionized numerous fields, including biomedical, for instance: magnetically guided drug delivery (chemotherapy enhancement), MRI, earth based astronomical telescopes (ferrofluid mirrors), electronic devices (liquid seals in hard disks and micropumps).
In order to take the most advantage of these advances more control of the underlying process is required. One of the key issues is the complex nature of the partial di fferential equations that are required to characterize the phenomena. These are nonlinear, multiscale with typically unknown domains (free boundary problems) with a Young-Laplace equation on the free boundary to account for surface tension.
In this talk we will give a novel proof for the second order order sufficient conditions for an
optimal control problem where the state system is composed of Laplace equation in the bulk and Young-Laplace on the free boundary. We will use piecewise linear finite elements to discretize the control problem and prove the optimal a priori error estimates. Finally, we will discuss a novel analysis for a problem closely related to the extrusion process where the bulk equations are Stokes equations.
This talk will also serve as an introduction to optimal control problems.
Refreshments available at 3:10 p.m.