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Post-doc High-Fidelity Multi-Resolution Aeroacoustics Simulations with the Lattice Boltzmann Method - LMFA / Univ Lyon

Du 1 mars 2019 au 31 décembre 2019

Starting as soon as possible.
Laboratory of Fluid Mechanics and Acoustics
CNRS, Ecole Centrale de Lyon
36 avenue Guy de Collongue, F-69134 Ecully cedex (France)

For further information, please contact
emmanuel.leveque@ec-lyon.fr


The Laboratory of Fluid Mechanics and Acoustics (CNRS, Ecole Centrale de Lyon) is seeking a highly qualified candidate for a post-doctoral research fellowship regarding the development of grid- refinement techniques for high-fidelity Lattice Boltzmann aeroacoustics simulations.

The Lattice Boltzmann method is gaining increasing interest in Computational Fluid Dynamics. While traditional methods rely on a discretization of the Navier-Stokes equations at a macroscopic level, the LB method considers the fluid at a kinetic level. Capturing the dynamics of collections of fluid particles distributed over a lattice is here preferred to solving non-linear PDEs.

Processing a simulation in this way has some advantages. The low numerical dissipation allows for accurate simulation of time-dependent flows, enabling sensitive applications such as aeroacoustics. Furthermore, the high scalability on massively parallel computers can lead to advantageous turn-around times for industrial applications. Nevertheless, there is also a dark side. In particular, the streaming of particles along the lattice links confines the spatial discretization to a uniform Cartesian grid, which is an obvious limitation for complex-flow simulations. Additional grid-refinement techniques are needed to extend the method to multi-resolution domains. A major issue is to overcome connectivity failure at the interface between domains without sacrificing the efficiency and low numerical dissipation of the LB method [1].

The Laboratory of Fluid Mechanics and Acoustics (CNRS, Ecole Centrale de Lyon) is seeking a highly qualified candidate for a post-doctoral research fellowship regarding the development of grid- refinement techniques for high-fidelity Lattice Boltzmann aeroacoustics simulations. Despite its importance, this scientific issue remains mainly open. The body of literature presenting validated multi-resolution LB schemes for aeroacoustic simulations is very limited [2].

The successful candidate will participate in our research group to the development of new grid-refinement techniques and perform simulations with our in-house LB code (written in C++) to validate his developments on academic test cases.

This research activity will be part of a major project funded by the DGAC (French Civil Aviation)and directed by Airbus on the development of “New-Generation Modeling Tools inAeronautics”. The successful candidate will therefore develop his research activity collaboratively with the other academic and industrial partners of the project.

Scientific references:
[1] H. Touil, D. Ricot and E. Lévêque: Direct and Large-Eddy simulation of turbulent flows on composite

multi-resolution grids by the Lattice Boltzmann method, Journal of Computational Physics 256 2014. [2] F. Gendre, D. Ricot, G. Fritz and P. Sagaut: Grid Refinement for aeroacoustics in the lattice Boltzmann

method: A directional splitting approach, Physical Review E 96 (2) 2017.

Qualifications:
Ph.D. in Engineering, Physics, Theoretical and Applied Mechanics, Applied Mathematics Contributions in the area of scientific computing and Computational Fluid Dynamics Prior Experience in the Lattice Boltzmann method is an advantage

Duration :
12 months

Net Salary :
about 2100 € / month

Location :
Laboratoire de Mécanique des Fluides et d’AcoustiqueCNRS UMR 5509
Ecole Centrale de Lyon
36 Avenue Guy de Collongue
F-69134 Ecully cedex
France

Application:
a detailed CV with a cover letter
a summary of recent work and interests at least one letter of reference

Contact :
Dr. Emmanuel Lévêque

emmanuel.leveque@ec-lyon.fr
Review of applications will begin immediately and continue until the position is filled.