Výsledky vyhledávání - "Lionel Le Penven"

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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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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DNS of bypass transition in entrance channel flow induced by boundary layer interaction

Autor: Julien Montagnier, Anne Cadiou, Marc Buffat, Lionel Le Penven

Publikováno v: European Journal of Mechanics-B/Fluids
European Journal of Mechanics-B/Fluids, Elsevier, 2014, ⟨10.1016/j.euromechflu.2013.06.009⟩

International audience; Developing entrance flows are of interest in a large number of application areas. They have been widely studied in the past, but many aspects of these flows are not yet fully understood. One of the questions concerns the stabi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a194e4bdabc66f9266d477ca295cecf4
https://doi.org/10.1016/j.euromechflu.2013.06.009

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DNS of the Turbulent Flow Evolving in a Plane Channel from the Entry to the Fully Developed State

Autor: Anne Cadiou, Lionel Le Penven, M. Capuano, Marc Buffat

Publikováno v: Springer Proceedings in Physics ISBN: 9783319291291

Direct numerical simulation of the turbulent flow spatially developing in a plane channel is performed. The channel is long enough for the turbulence to achieve the statistically invariant state in space and time. Spatial evolution of statistical qua

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a17889ef5a809074d5ad046b900cd68
https://doi.org/10.1007/978-3-319-29130-7_23

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Towards petascale spectral simulations for transition analysis in wall bounded flow

Autor: Lionel Le Penven, Anne Cadiou, Julien Montagnier, Marc Buffat

Publikováno v: International Journal for Numerical Methods in Fluids. 72:709-723

SUMMARY An efficient parallel spectral method for direct numerical simulations of transitional and turbulent flows is described in this paper. The parallelization is classically based on a bidimensional domain decomposition, but has been specifically

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5aaeb713c2e2b23686dc11f870150afc
https://doi.org/10.1002/fld.3758

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Numerical simulation of wall roughness effects in cavitating flow

Autor: Lionel Le Penven, Fraj Echouchene, Marc Buffat, Hafedh Belmabrouk

Publikováno v: International Journal of Heat and Fluid Flow
International Journal of Heat and Fluid Flow, Elsevier, 2011, 32, pp.1068-1075. ⟨10.1016/j.ijheatfluidflow.2011.05.010⟩

Hydrodynamic cavitation has an important effect on the performance of Diesel injectors. It influences the nature of the fuel spray and the efficiency of the combustion process. In the present study, we investigate numerically the effect of wall rough

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c56dc8316629083e5f2046fa73733c3a
https://doi.org/10.1016/j.ijheatfluidflow.2011.05.010

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In situ analysis and visualization of massively parallel computations

Autor: Marc Buffat, Anne Cadiou, Christophe Pera, Lionel Le Penven

Publikováno v: International Journal of High Performance Computing Applications
International Journal of High Performance Computing Applications, SAGE Publications, 2015, pp.1094342015597081. ⟨10.1177/1094342015597081⟩

Massively parallel simulations generate increasing volumes of big data, whose exploitation requires increasingly large storage resources, efficient networking technologies and post-processing facilities. In the coming era of exascale supercomputing,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a94bd22ae1c5c870ff473a61a40c8989
https://hal.archives-ouvertes.fr/hal-01298327

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DNS of Turbulent By-Pass Transition at the Entrance of a Plane Channel

Autor: Anne Cadiou, J. Montagnier, Marc Buffat, Lionel Le Penven

Publikováno v: Progress in Turbulence V ISBN: 9783319018591

Direct numerical simulations of boundary layers transition and their interaction in a very elongated plane channel are presented.Wall-normal velocity perturbations of small amplitude and with a spanwise wavelength of the order of the boundary layer t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1c540dd64ac779580d56a177a8c07e51
https://doi.org/10.1007/978-3-319-01860-7_10

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Compression of a turbulent vortex flow

Autor: O.Le Roy, Lionel Le Penven

Publikováno v: International Journal of Heat and Fluid Flow. 19:533-540

Reynolds-averaged Navier–Stokes equations are used in conjunction with different turbulence models to simulate the evolution of a turbulent vortex flow submitted to a compression in a direction normal to its axis. A simplified configuration is cons

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3a6a7efb25aa842b0ebc17c09feecfd9
https://doi.org/10.1016/s0142-727x(98)10028-0

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Application of Reynolds Stress Modeling to Engine Flow Calculations

Autor: L. Lebrère, Lionel Le Penven, B. Dillies, Marc Buffat

Publikováno v: Journal of Fluids Engineering. 118:710-721

To improve the prediction of turbulence inside internal combustion engines, a Reynolds stress turbulence model is implemented in the Kiva-II code. After a rapid description of the Launder-Reece-Rodi model (noted LRR), two validation test cases (the p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f35010450ccb634e51d7c9bc57a0cae
https://doi.org/10.1115/1.2835500

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