Topic : Lattice-Boltzmann methods
Background, Context :
The industry relies increasingly on numerical simulation for designing, improving, and even validating new combustion devices (engine, burner, furnace, etc.). Today, numerical combustion modelling relies almost exclusively on numerical codes solving the Navier-Stokes equations.
The Lattice Boltzmann solvers are very different from these codes, intending to solve a discrete variant of the Boltzmann equation. This type of flow solver is progressing rapidly, however, in turbulent flows configurations. The results obtained with Lattice Boltzmann methods (LBM) have shown to be excellent for aerodynamic applications, motivating intensive development of new methods.
Lattice Boltzmann methods applied to industrial applications are recent, however, and few models are able to deal with multiphase flows, and almost none with reactive (combusting) flows.
The development of combustion modelling within the LBM framework is the topic of this study, following our recent works.
Research subject, work plan :
Extending the LBM capabilities to combustion requires a profound rethinking of existing methods developed within the Navier-Stokes framework.
The team has recently made important steps in proving the LBM ability to tackle such flows, at a cost significantly reduced compared to classical results.
In collaboration with combustion scientists from IRPHE and M2P2, we were recently awarded a national grant to study the effect of (i) detailed H2 kinetics, (ii) gravity and (iii) thermal losses at the walls on the propagation of H2-air premixed flames in channels. We will focus on the vibro-acoustic coupling observed in Hele-Shaw cells, which can stabilize or destabilize flame propagation.
The PhD candidate will develop models for (i) heat losses at the walls and (ii) plate vibro-acoustic forcing in the present approach. We will then be able to investigate their effects on the H2 flame propagation in quiescent flows and compare with results obtained by the IRPHE team.
Thanks to the proximity of the two labs (500 meter) apart, the PhD candidate will also punctually help and assist in the experimental studies at IRPHE, where another PhD candidate and postdoc will be hired. He will then get acquainted with the three main topics in combustion: analytical, studies, and experimental studies.
The PhD candidate will also be part of the team developing the ProLB software at M2P2 (~25 full-time researchers, from PhD candidates to full Profs.) ProLB is a software codeveloped by a strong academic/industrial consortium including Airbus, CS group, LMFA lab, M2P2 lab and Renault.
3 years / Salary according to Aix-Marseille University standards.
Essential skills :
Strong background in scientific computing (c++ preferred), compressible flows, reactive flows. English.
Desired skills :
LBM, HPC, French.
Email CV, cover letter to Pierre BOIVIN : email@example.com.
Intended Start date: In 2021, negotiable depending on profile.
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