SCD News > Announcement: October 13, 2005

IMAGe/GTP joint seminar October 24: "Laboratory models of astrophysical and geophysical turbulence"

Presented by:

Daniel P. Lathrop
Department of Physics
University of Maryland

Date, time, location:

Monday, October 24, 2005
1:30 p.m.
Foothills Bldg. 2, Room 1001

Abstract

Turbulence occurs in the Earth's atmosphere and outer core, in the atmospheres of the other planets, and in the convective zones of stars including our sun. We probe aspects of the dynamics of these flows using experiments in liquid sodium, helium, nitrogen, and water (not of course mixed together!). The goal of these several experimental devices is to explore how turbulence interacts with rotation, magnetic fields or both.

As both add some measure of elasticity to the flows, several types of oscillatory behavior are observed in the experiments depending on the force balance involved. Ordering the Coriolis, Lorentz, and inertial forces is key to understanding the complicated states observed. While these experiments are undertaken in part to understand the geodynamo, they have led to a number of different first observations, including the magnetorotational instability, inertial waves in spherical Couette flow and inertial waves in decaying rotating turbulence in cryogenic fluids.

For more information, contact Liz Rothney at x1351, rothney@ucar.edu