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

  Monday 21 November 2016 at 14h00

  Phd Thesis       SALLE DE SEMINAIRES    

Abstract:

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.

Jury:

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

CALENDAR

Monday

27

May

2024

🎓 PhD Defense: Thibault GIOUD

Monday 27 May 2024From 14h00 at 18h00

  Phd Thesis       Cerfacs, Toulouse, France    

Thursday

30

May

2024

Young PhD day (JDD2024@Cerfacs) – 30/05/2024

Thursday 30 May 2024From 9h00 at 17h00

  Journée des Doctorants       CERFACS     

Monday

03

June

2024

High fidelity simulations of Turbomachinery flows

From Monday 3 June 2024 to Wednesday 5 June 2024

  Training    

ALL EVENTS