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The 2 November 2016 at 14h00

PhD Defense: Carlos PÉREZ ARROYO – Large Eddy Simulations of a dual stream jet with shock-cells and noise emission analysis


Abstract :

This thesis deals with the shock-cell noise generated by under-expanded supersonic jets in single- and dual-stream configurations. Shock-cell noise is generated by the interaction between the turbulent structures of the shear-layer and the shock-cell system developed in the potential core of the jet. In order to study shock-cell noise, large eddy simulations adapted to aeroacoustics are carried out using high-order compact schemes that allow for a non-dissipative non-dispersive approach. The results are analyzed and compared to experimental results. In particular, an acoustic-hydrodynamic filtering is carried out in the near field in order to analyze the acoustic and hydrodynamic azimuthal modes. Moreover, a wavelet-based analysis is implemented in order to identify the relevant acoustic and hydrodynamic features of the supersonic jets.

Jury :
Christophe BAILLY   LMFA Rapporteur (Referee)
Paul TUCKER          Univeristy of Cambridge Rapporteur (Referee)
Yves GERVAIS         Institut PPRIME Examinateur (Member)
Xavier GLOERFELT ENSAM (DynFluid) Examinateur (Member)
Christophe AIRIAU   Univ. Paul Sabatier Directeur de thèse (Advisor)
Guillaume PUIGT     CERFACS co Directeur de thèse (co Advisor)


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

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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

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"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