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The 21 November 2016 at 14h00

PhD Defense: Thibaut BRIDEL-BERTOMEU – Investigation of Unsteady Phenomena in Rotor/Stator Cavities Using Large Eddy Simulation



This thesis provides a numerical and theoretical investigation of transitional and turbulentenclosed rotating flows, with a focus on the formation of macroscopic coherent flow structures. The underlying processes are strongly three-dimensional due to the presence of boundary layers on the discs and on the walls of the outer (resp. inner) cylindrical shroud (resp. shaft). The complexity of these flows poses a great challenge in fundamental research however the present work is also of importance for industrial rotating machinery, from hard-drives to space engines turbopumps – the design issues of the latter being behind the motivation for this thesis.
The present work consists of two major investigations. First, industrial cavities are modeled by smooth rotor/stator cavities and therein the dominant flow dynamics is investigated. For the experimental campaigns on industrial machinery revealed dangerousunsteady phenomena within the cavities, the emphasis is put on the reproduction and monitoring of unsteady pressure fluctuations within the smooth cavities. Then, the LES of three configurations of real industrial turbines are conducted to study in situ the pressure fluctuations and apply the diagnostics already validated on academic problems.


DdR. Eric SERRE, M292CNRS, Rapporteur
Pr. M.P. JUNIPER, Cambridge University, Rapporteur
Pr. G. CASALIS, ISAE, Examinateur
Dr. K. OBERLEITHNER, TUB,Examinateur
DdR. Patrice LE GAL, IRPHE-CNRS, Examinateur
Dr. Fabien JUILLET, Safran Aircraft Engines, Encadrant Entreprise
Dr. Jérôme DEHOUVE, CNES DLA, Encadrant Entreprise
Dr. Laurent GICQUEL, Cerfacs, Directeur de thèse
Dr. Gabriel STAFFELBACH,Cerfacs, Co-Directeur de thèse


CECI Contribution to CNRS’ “Petit Illustré” on Complex Systems (CNRS Edition)

ROGEL |  12 October 2017

CECI (Cerfacs, CNRS) and IMFT are both working on numerical modelling of the processes causing river flooding and their uncertainties. A common contribution on this subject, signed by Sophie Ricci and Hélène Roux, appears in Vol. 34 of the "Petit Illustré" collection, edited by CNRS.Read more

CERFACS was present at the European Researcher Night 2017 at Toulouse

thual |  1 October 2017

"Can we get an engine, an airplane or the entire Earth into a computer?". Such was the catchy title of the CERFACS stand  Friday September 29th, for the "European Research Night" whose theme was "Impossible". A hundred people at the "Quai des Savoirs" in Toulouse took a close interest in the...Read more