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

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If you have a question about this talk, please contact Mustapha Amrani .

The Nature of High Reynolds Number Turbulence

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.

This talk is part of the Isaac Newton Institute Seminar Series series.

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