G
Grégoire Lemoult
Researcher at Institute of Science and Technology Austria
Publications - 15
Citations - 614
Grégoire Lemoult is an academic researcher from Institute of Science and Technology Austria. The author has contributed to research in topics: Turbulence & Open-channel flow. The author has an hindex of 8, co-authored 15 publications receiving 487 citations. Previous affiliations of Grégoire Lemoult include University of Manchester & Centre national de la recherche scientifique.
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Directed percolation phase transition to sustained turbulence in Couette flow
TL;DR: In this article, it was shown that the onset of turbulence is a second-order phase transition and falls into the directed percolation universality class, and that the complex laminar-turbulent patterns distinctive for the onset time of turbulence in basic shear flows are characterized by universal critical exponents.
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The rise of fully turbulent flow
Dwight Barkley,Baofang Song,Baofang Song,Baofang Song,Vasudevan Mukund,Grégoire Lemoult,Marc Avila,Björn Hof +7 more
TL;DR: A bifurcation scenario is uncovered that explains the transformation to fully turbulent pipe flow and the front dynamics of the different states encountered in the process and is bridged between understanding of the onset of turbulence and fully turbulent flows.
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Turbulent spots in a channel: large-scale flow and self-sustainability
TL;DR: In this article, a developing turbulent spot is followed in space and time in a rectangular channel flow for more than 100 advective time units, and the flow can be decomposed into a large-scale motion consisting of an asymmetric quadrupole centred on the spot and a small-scale part consisting of streamwise streaks.
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Experimental scaling law for the subcritical transition to turbulence in plane Poiseuille flow.
TL;DR: The role of coherent structures, such as hairpin vortices, in the transition to turbulence in a plane Poiseuille flow is discussed and the minimal amplitude of the perturbation triggering transition scales asymptotically as Re(-1).
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Turbulent spots in channel flow: an experimental study: large-scale flow, inner structure and low-order model.
TL;DR: The internal structure of a turbulent spot is measured, with Time Resolved Stereoscopic Particle Image Velocimetry, and the observation of travelling-wave-like structures at the trailing edge of the turbulent spot.