PHYSICAL MATHEMATICS SEMINAR


TOPIC:		Lagrangian Structures and their Analysis in Fluid Flows


SPEAKER:	GEORGE HALLER
		Department of Mechanical Engineering
		Massachusetts Institute of Technology


Abstract:

The emergence of robust coherent structures in two-dimensional turbulence
is a well-known phenomenon.  In this talk, we give a Lagrangian
description of these structures, emphasizing their effect on fluid mixing.
We describe recent analytic techniques for the extraction of Lagrangian
coherent structures from finite-time flow data.  As applications, we
discuss evaluation of mixing experiments, pollution control in the ocean,
and active flow control in shear flows.

DATE:		TUESDAY, APRIL 16, 2002

TIME:		2:30 PM

LOCATION:	Building 2, Room 338


Refreshments will be served at 3:30 PM in Room 2-349


Massachusetts Institute of Technology
Department of Mathematics
Cambridge, MA  02139