Position details
analysis of sound propagation and instability modes for a turbofan
Training ›
Computational Fluid Dynamics - Aerodynamics
Required Education / Niveau requis
BAC+5 (master or engineering school)
From / Date de début
February to may 2013
Duration / Durée
6 months
Context / Contexte
Noise emissions near airports become more and more severe and any industry need to introduce numerical computations to replace real-life tests. Building schemes / boundary conditions dedicated to aeroacoustic isn’t easy since quantities fluctuations to capture are very small (some Pascal for the pressure with a mean value about 101 000 Pascal), unsteady but their effects must be understood in the whole computational domain. Finally, one looks for high-order low-dissipation low-dispersion schemes. In parallel, boundary conditions must account for characteristic waves entering and leaving the domain. Cerfacs has implemented and validated in elsA kernel (from ONERA) all numerical techniques dedicated to the computation of jets for aeroacoustic.
Cerfacs is a partner of the European project AeroTranet-2 which goal is to build, to validate and to promote the usage of simulation and post-treatment aeroacoustic tools for turbofan. We recall that a turbofan produces two coaxial jets, the inner one is hot and shocked and the outer one is cold.
Description / Description
This trainee period must be seen as preparatory work for the PhD thesis of AeroTranet-2 that is founded by the European Commission. Within AeroTranet-2 project, Cerfacs must do a Large Eddy Simulation (LES) of the turbofan and must extract from the computation steady and unsteady data. In parallel, C. Airiau from IMFT will work with another PhD student on tools to analyse unsteady phenomena driving noise production. The goal is therefore to make both PhD students work together on 1) the computation and 2) the post-treatment. During the training period, the student will have to understand the methodology to perform aeroacoustic computations with elsA. A LES computation (ever done at Cerfacs) will be performed. Finally, the main activity will concern a dedicated post-treatment based on POD (Proper Orthogonal Decomposition). If there remains time, a technique to identify noise sources will be implemented.
We look for a student with a strong desire to learn aeroacoustic. A good background on physics and (basic) mathematics is needed. A student with a French master can apply to the position but won’t be able to work at Cerfacs and he/she would be exchanged with a student from another partner. The student will work in the CFD team and in the AAM group. The work is therefore done in an integrated framework with many relations with other people involved in aeroacoustiuc at Cerfacs. The student will also participate in establishing strong relations with IMFT and C. Airiau.
Contacts / Contacts
Name: Puigt Guillaume
Phone: +33 (0)5 61 19 30 94
Fax: +33 (0)5 61 19 30 00
Email: guillaume.puigt@cerfacs.fr
Name: Boussuge Jean-François
Phone: +33 (0)5 61 19 30 62
Fax: +33 (0)5 61 19 30 00
Email: boussuge@cerfacs.fr
Salary / Rémunération
about 580 euros / month
