Fluid Mechanics and Acoustics Laboratory - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Home > Teams > Turbulence & Instabilities > Casual seminar > Past seminars > Séminaires 2016

Thibault Lestang

Simulation numérique des fluctuations extrêmes de la trainée sur un système immergé dans un écoulement turbulent

Mardi 29 novembre 2016, 13h, ECL bât I11 salle de réunion 1er étage

Simulation numérique des fluctuations extrêmes de la trainée sur un système immergé dans un écoulement turbulent

Turbulent flows are known to generate important fluctuations of local velocity and pressure. This fluctuations can have an important mechanical on immersed structures. It is common practice in the engineer community to study the flow around immersed structures using synthetic turbulent flows that do not render the physics of these extreme fluctuations. Furthermore, because these fluctuations are rare, there is
no hope in generating them through direct numerical simulations. However, it is possible to bias the statistics of these fluctuations using techniques inherited from statistical physics, recently applied to the study of dynamical systems.
The application of such methods to turbulent flows allows one to generate rare fluctuations with a reasonable numerical cost, without having to modify the dynamics of the flow, generated through DNS. This presentation will feature the results
of the application of this approach to a simple flow, serving as a proof of concept and thus paving the way to applications to complex systems, closer to industrial concerns.