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.
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.
The successful candidate will participate 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 in Aeronautics”. The successful candidate will therefore develop his research activity collaboratively with the other academic and industrial partners of the project.