PSU Mark
Eberly College of Science Mathematics Department

Meeting Details

For more information about this meeting, contact Victor Nistor, Stephanie Zerby, Mark Levi, Jinchao Xu, Ludmil Zikatanov.

Title:Some puzzles about Couette flow
Seminar:CCMA Luncheon Seminar
Speaker:Zhiwu Lin, Georgia Tech Mathematics
Abstract:
Couette flows are shear flows with a linear velocity profile between two plates. It is one of the simplest but  important laminar flows. We will discuss two unresolved issues about them. First, Couette flows are known to be linearly stable for any Reynolds number, but become turbulent for large Reynolds numbers by both experimental and numerical results. We will discuss several attemps to explain the nature of transient turbulence near Couette. Second, starting from the work of Orr in 1907, the velocity of the linearized inviscid equation at Couette flows is known to decay in time. But the nonlinear inviscid damping is still open. The mechanism of such inviscid damping is important to understand the appearance of coherent structures in 2D turbulence.

Room Reservation Information

Room Number:MB114
Date:04 / 12 / 2013
Time:12:20pm - 01:30pm