2016•Physical Review FluidsRequires access

Coherent structures in transitional pipe flow

Leo H. O. Hellström, Bharathram Ganapathisubramani, Alexander J. Smits

Abstract

Transition to turbulent in a pipe flow is investigated experimentally. The flow is analyzed using proper orthogonal decomposition, and it is found that the flow in the turbulent slugs closely resembles fully developed turbulence, and the flow in the intervening pseudo-laminar regions is governed by azimuthally steady traveling waves.

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Key concepts: Laminar flow, Turbulence, Mechanics, Flow (mathematics), Pipe flow, Open-channel flow, Lagrangian coherent structures, Plug flow