Turbulent spots in channel flow: An experimental study: Large-scale flow, inner structure and low-order model
We present new experimental results on the development of turbulent spots in channel flow. The internal structure of a turbulent spot is measured, with Time Resolved Stereoscopic Particle Image Velocimetry. We report the observation of travelling-wave-like structures at the trailing edge of the turb...
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| Veröffentlicht in: | The European physical journal. E, Soft matter (Print) Soft matter (Print), 2014-04, Vol.37 (4), p.25-25, Article 25 |
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| container_title | The European physical journal. E, Soft matter (Print) |
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| creator | Lemoult, Grégoire Gumowski, Konrad Aider, Jean-Luc Wesfreid, José Eduardo |
| description | We present new experimental results on the development of turbulent spots in channel flow. The internal structure of a turbulent spot is measured, with Time Resolved Stereoscopic Particle Image Velocimetry. We report the observation of travelling-wave-like structures at the trailing edge of the turbulent spot. Special attention is paid to the large-scale flow surrounding the spot. We show that this large-scale flow is an asymmetric quadrupole centred on the spot. We measure the time evolution of the turbulent fluctuations and the mean flow distortions and compare these with the predictions of a nonlinear reduced order model predicting the main features of subcritical transition to turbulence.
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| doi_str_mv | 10.1140/epje/i2014-14025-2 |
| format | Article |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Biological and Medical Physics Biophysics Complex Fluids and Microfluidics Complex Systems Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Irreversible Dynamics: A topical issue dedicated to Paul Manneville Nanotechnology Physics Physics and Astronomy Polymer Sciences Regular Article Soft and Granular Matter Surfaces and Interfaces Thin Films Transition to turbulence Turbulent flows, convection, and heat transfer |
| title | Turbulent spots in channel flow: An experimental study: Large-scale flow, inner structure and low-order model |
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