Postdoc on Turbulent inflow conditions for the Lattice Boltzmann Method, LMFA, Ecully (France)

Turbulent inflow conditions for the Lattice Boltzmann Method

Laboratory of Fluid Mechanics and Acoustics

École Centrale de Lyon, CNRS
36 avenue Guy de Collongue, F-69134 Ecully cedex (France)

The Lattice Boltzmann method (LBM) 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.

Corner separation flow in a compressor cascade.

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 synthetic turbulent inflow conditions for high-fidelity Lattice Boltzmann simulations. Such methods have been developed in the context of Navier- Stokes approaches at the laboratory. The objective is here to adapt and extend those methods in the context of LBM, with a particular attention paid to the generation of noise.

The successful candidate will be in charge of the development and implementation of turbulent inflow conditions in an in-house LB code (written in C++). Validations and

evaluations will be carried-out on cases of increasing complexity: isolated boundary layer, compressor cascade (see figure) and a fan configuration.

This research activity is carried out within a collaboration between the teams ‘Turbulence and instabilities’ and ‘Turbomachinery’ at the laboratory. It is part of a major project co- funded by the DGAC (French Civil Aviation) and directed by Airbus. The successful candidate will therefore develop his research activity collaboratively with the other academic and industrial partners of the project.

Scientific references:
[1] J. Boudet, A. Giauque, “Adaptation and evaluation of a weak recycling strategy for inflow boundary

layers in large-eddy simulation”, Computers and Fluids, vol.203, 2020.
[2] B. Xie, F. Gao, J. Boudet, L. Shao, L. Lu, "Improved vortex method for large-eddy simulation inflow

generation", Computers and Fluids, vol.168, p.87-100, 2018.

Qualifications:
PhD in Engineering, Physics, Theoretical and Applied Mechanics, or 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:
between 1,848 € and 2,175 € per month

Location:
Laboratoire de Mécanique des Fluides et d’Acoustique CNRS UMR 5509
École Centrale de Lyon
36 Avenue Guy de Collongue
F-69134 Écully cedex
France

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

Contact:
Jérôme Boudet (jerome.boudet@ec-lyon.fr)
Emmanuel Lévêque (emmanuel.leveque@ec-lyon.fr)

Review of applications will begin immediately and continue until the position is filled.