Events Calendar

AME - Department Seminar

Speaker: P. Henrik Alfredsson, Professor Linné FLOW Centre KTH Mechanics Royal Institute of Technlogy

Talk Title: Rotation Effects on Instability and Turbulence on Simple Shear Flows

Abstract: Effects of rotation (centrifugal and/or Coriolis forces) are usually felt on large scales (such as planetary scales) or at very high rotation rates such as turbines and compressors. However laboratory scale shear flows may be strongly affected also by quite small rotation rates. In this talk we concentrate on two cases: spanwise rotation of shear flows (here we will focus on plane Couette flow) and axial rotation of circular pipe flow. Both flows show surprising effects of the rotation, in the first case due to the Coriolis force that can either stabilize or destabilize the flow. For stabilizing rotation turbulence may be completely killed, whereas for the destabilizing case a number of different instabilities can be observed. For the axially rotating turbulent pipe flow the symmetry is broken by rotation and the flow will never reach solid body rotation. An unexpected feature occurring if the flow is issued as a swirling jet will also be discussed.

Host: Dr. Veronica Eliasson

More Info: http://ae-www.usc.edu/seminars/11-16-12-alfredsson.shtml

Location: Room 101

Audiences: Everyone Is Invited

Contact: April Mundy

Event Link: http://ae-www.usc.edu/seminars/11-16-12-alfredsson.shtml