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Le 2 novembre 2016 à 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)