Zobrazeno 1 - 10 of 31 pro vyhledávání: '"Frédéric Alizard"'
1
Linear instabilities of pulsatile plane channel flow between compliant walls
Autor: Smail Lebbal, Frédéric Alizard, Benoît Pier
Publikováno v: Journal of Fluid Mechanics. 948
The linear dynamics of perturbations developing in an infinite channel with compliant walls is investigated for pulsatile flow conditions. Two-dimensional modal perturbations are considered for Womersley-type pulsating base flows and the wall motion
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::364197a631b27bdd24906754abfebaa0
https://doi.org/10.1017/jfm.2022.658
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4
Restricted optimal paths to transition in a plane Couette flow
Autor: Bastien Di Pierro, Anne Cadiou, Lionel Le Penven, Frédéric Alizard, Marc Buffat
Publikováno v: European Journal of Mechanics-B/Fluids
European Journal of Mechanics-B/Fluids, Elsevier, 2021, 85, pp.261-275. ⟨10.1016/j.euromechflu.2020.10.004⟩
International audience; To identify laminar/turbulent transition paths in plane Couette flow, a varia-tional formulation incorporating a restricted nonlinear (RNL) system that retains a single streamwise Fourier mode, is used. Considering the flow ge
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e6e71184d60c72f34fbba35c9ccc687
https://hal.archives-ouvertes.fr/hal-02972434/file/article_RNL_OPT.pdf
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5
Oblique and streamwise vortex paths in a plane Couette flow using a RNL system
Autor: Frédéric Alizard
Publikováno v: Comptes Rendus Mécanique
Comptes Rendus Mécanique, Elsevier, In press, pp.1-10. ⟨10.5802/crmeca.55⟩
International audience; This paper revisits oblique wave and streamwise vortex scenarios in a plane Couette flow using restricted nonlinear simulations, where only a single Fourier mode for perturbation is retained. It is shown that this restriction
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dad1021c39e56ba0f269c8b664cd166f
https://hal.archives-ouvertes.fr/hal-03016962/file/crmeca-ob_sv_rnl.pdf
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6
Space–time dynamics of optimal wavepackets for streaks in a channel entrance flow
Autor: Frédéric Alizard, B. Di Pierro, Anne Cadiou, Lionel Le Penven, Marc Buffat
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 844, pp.669-706. ⟨10.1017/jfm.2018.191⟩
International audience; Laminar/turbulent transition of a channel entrance flow for uniform inlet condition is revisited using global linear optimization analyses and direct numerical simulations. This work focuses on the region near the inlet, for a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a8068992efe89c8ba789b5c8ba2c6a5
https://doi.org/10.1017/jfm.2018.191
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7
Investigation of the dynamics in separated turbulent flow
Autor: Jean-Marc Foucaut, Laurent Keirsbulck, Jean-Christophe Robinet, Frédéric Alizard, Jean-Philippe Laval, Marc Lippert, Fawzi Fadla, Camila Chovet
Publikováno v: European Journal of Mechanics-B/Fluids
European Journal of Mechanics-B/Fluids, Elsevier, 2019, 76, pp.190-204. ⟨10.1016/j.euromechflu.2019.01.006⟩
European Journal of Mechanics-B/Fluids, 2019, 76, pp.190-204. ⟨10.1016/j.euromechflu.2019.01.006⟩
Dynamical behavior of the turbulent channel flow separation induced by a wall-mounted two-dimensional bump is studied, with an emphasis on unsteadiness characteristics of vortical motions evolving in the separated flow. The present investigations are
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2f8cbb8483f486296d0c6e3b952f26c
https://hal.archives-ouvertes.fr/hal-02331158/document
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8
Restricted nonlinear model for high- and low-drag events in plane channel flow
Autor: Frédéric Alizard, Damien Biau
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2019, 864, pp.221-243. ⟨10.1017/jfm.2019.14⟩
A restricted nonlinear (RNL) model, obtained by partitioning the state variables into streamwise-averaged quantities and superimposed perturbations, is used in order to track the exact coherent state in plane channel flow investigated by Toh & Itano
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d19022a3f3ad358281ee677c49c27154
https://hdl.handle.net/10985/18049
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9
Instabilities in oblique shock wave/laminar boundary-layer interactions
Autor: Frédéric Alizard, J.-Ch. Robinet, F. Guiho
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2016, 789, pp.1-35. ⟨10.1017/jfm.2015.729⟩
International audience; The interaction of an oblique shock wave and a laminar boundary layer developing over a flat plate is investigated by means of numerical simulation and global linear-stability analysis. Under the selected flow conditions (free
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5067d33651825096b2c4c0301c1d0504
https://doi.org/10.1017/jfm.2015.729
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10
Three-dimensional instability of a ow past a sphere: Mach evolution of the regular and Hopf bifurcations
Autor: Andrea Sansica, Frédéric Alizard, Eric Goncalves, J.-Ch. Robinet
Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 855, pp.1088-1115. ⟨10.1017/jfm.2018.664⟩
A fully three-dimensional linear stability analysis is carried out to investigate the unstable bifurcations of a compressible viscous fluid past a sphere. A time-stepper technique is used to compute both equilibrium states and leading eigenmodes. In
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb92e322df4cc6d0b6507763642a2d33
https://hal.archives-ouvertes.fr/hal-01960112
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