# University of Minnesota

Aerospace Engineering and Mechanics

**Spring 2003 Seminar Series**

*Theory of Heterogeneous Turbulence*

*Abstract*

**Much of what we know about clasical fluid mechanics at high Reynolds
numbers originates from theories which assume the fluid motions are both
isotropic and homogeneous. However, almost all real flows are both anisotropic
and heterogeneous. The efficacy of the established theory results from the idea
of "local isotropy". That is, at small enough scale the fluid motions
are not dependent on the boundary conditions of a given problem. Considerable
time and effort has been put forth in the last 50 years towards better
understanding, validation, and modeling of the universal nature of the small
scales of motion. In this talk, experimental data will be presented from
several canonical flows that exploits the heterogeneous and anisotropic nature
of flows at all length scales. Theoretical and experimental observations of the
vorticity field will be used to catalyze the discussion. It will be argued that
future modeling efforts, and in particular time dependent calculations such as
LES, will depend on theories which explicitly account for non-universal flow
features.**

### Friday, February 7, 2003

209 Akerman Hall

2:30-3:30 p.m.

### Refreshments served after the seminar in
227 Akerman Hall.

Disability accomodations provided upon request.

Contact the AEM Office, 625-8000.