Bifurcation phenomena in the flow through a sudden expansion in a circular pipe

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Bifurcation phenomena in the flow through a sudden expansion in a circular pipe's image

Description:	Seddon, J (Manchester) Friday 12 September 2008, 12:10-12:30

Created:

2008-10-09 12:34

Collection:

The Nature of High Reynolds Number Turbulence

Publisher:

Isaac Newton Institute

Seddon, J

Language:

eng (English)

Keywords:

Transition; Turbulence;

Credits:

Author:	Seddon, J
Producer:	Steve Greenham


Abstract:	We report the results of an experimental investigation of laminar and time-dependent flows through a sudden expansion in a circular pipe. The flow state was investigated using high resolution MRI imaging techniques which have allowed us to settle a long standing debate on the first instability that occurs. As Re is increased, the flow passes through a steady symmetry breaking bifurcation such that the position of the recirculating eddy becomes asymmetric within the pipe. This in turn gives way to simple periodic motion via a Hopf bifurcation with further increase in Re. A seminar from the Wall Bounded Shear Flows: Transition and Turbulence conference in association with the Newton Institute programme: The Nature of High Reynolds Number Turbulence www.newton.ac.uk/programmes/HRT/seminars/

Abstract:

We report the results of an experimental investigation of laminar and time-dependent flows through a sudden expansion in a circular pipe. The flow state was investigated using high resolution MRI imaging techniques which have allowed us to settle a long standing debate on the first instability that occurs. As Re is increased, the flow passes through a steady symmetry breaking bifurcation such that the position of the recirculating eddy becomes asymmetric within the pipe. This in turn gives way to simple periodic motion via a Hopf bifurcation with further increase in Re.

A seminar from the Wall Bounded Shear Flows: Transition and Turbulence conference in association with the Newton Institute programme: The Nature of High Reynolds Number Turbulence www.newton.ac.uk/programmes/HRT/seminars/

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