Transient growth of perturbations in Stokes oscillatory flows
TypeArticles dans des revues avec comité de lecture
Oscillatory Stokes flows, with zero mean, are subjected to subcritical transition to turbulence. The maximal energy growth of perturbations is computed in the subcritical regime through an optimisation method. The results show strong amplifications during half a period. The energy transfer from the base flow involves an Orr mechanism with two-dimensional vorticity waves, and the maximum energy scales exponentially with the Reynolds number. Nonlinear simulations show that low-energy perturbations are sufficient to trigger turbulent flow.
Showing items related by title, author, creator and subject.
COLOMBET, Florent; PAILLOT, Damien; MERIENNE, Frédéric; KEMENY, Andras (ASME, 2010)Speed perception is an important task depending mainly on optic flow that the driver must perform continuously to control his/her vehicle. Unfortunately it appears that in some driving simulators speed perception is under ...
A LQR Washout Algorithm for a Driving Simulator Equipped with a Hexapod Platform: The Relationship of Neuromuscular Dynamics with the Sensed Illness Rating AYKENT, Baris; PAILLOT, Damien; MERIENNE, Frédéric; KEMENY, Andras (2012-07-05)This study proposes a method and an experimental validation to analyze dynamics response of the drivers with respect to the type of the control used in the hexapod driving simulator. In this article, two different forms ...
NAJJAR, Walid; PUPIN, Cédric; LEGRAND, Xavier; BOUDE, Serge; SOULAT, Damien; DAL SANTO, Philippe (SAGE Publications, 2014)During the preforming stage of woven reinforcement, in the first step of the RTM process, frictional phenomenon occurring at the tool/reinforcement interfaces and the reinforcement/reinforcement interfaces is one of the ...
Local and global spatio-temporal entropy indices based on distance- ratios and co-occurrences distributions LEIBOVICI, Didier G.; CLARAMUNT, Christophe; LE GUYADER, Damien; BROSSET, David (Taylor & Francis, 2014)When it comes to characterize the distribution of ‘things’ observed spatially and identified by their geometries and attributes, the Shannon entropy has been widely used in different domains such as ecology, regional ...
The GranOO workbench, a new tool for developing discrete element simulations, and its application to tribological problems ANDRE, Damien; CHARLES, Jean-Luc; IORDANOFF, Ivan; NEAUPORT, Jérôme (ScienceDirect, 2014)Discrete models are based on the descriptions of the physical states (e.g., velocity, position, temperature, magnetic momenta and electric potential) of a large number of discrete elements that form the media under study. ...