Subject
The diversity of volcanic eruption regimes, ranging from gas-rich, particle-laden jets to slow effusion of gas-poor
lava, is a direct consequence of the multiphase nature of magmas (a mixture of solids, liquids and gases), which has
not yet been rationalised within a single physical framework.
More generally, modelling and simulation of multiphase reactive flows cover a wide range of applications, from
combustion in automotive and aeronautical engines to atmospheric pollution, biomedical engineering and
pyroclastic flows.
In this postdoctoral project, we propose to take modelling, mathematical study and numerical simulation a step
further, offering a better understanding of the physical processes that occur in a volcanic vent. The aim of this
project, designed and developed by our two laboratories (LAMA and ISTerre) in collaboration with IMUS (Seville)
and CMAP (École Polytechnique), is to better understand the phase transition between separate-phase models (e.g.
gas flow within highly viscous magma) and dispersed-phase models (e.g. magma droplets in a gas phase during
fragmentation phenomena) by attempting to better understand the influence of rheology in these processes.
In particular, we will focus on the following questions:
- Characterisation of the speed of sound for a compressible/incompressible mixture and coupling.
- Consideration of rheology for better characterisation of macroscopic stresses.
The recruted postdoc will explore several approaches thanks to the different areas of expertise of the main contributors:
- Modelling of the phase transition between separate-phase and dispersed-phase models.
- Mathematical analysis of low Mach number regimes for multiphase mixtures.
- Modelling and mathematical analysis of low stability in a complex rheology framework.
- Assistance in porting the Samurai software to specific numerical studies related to LAMA/ISTerre/Locie.
Expected Skills
Multiphase mixing modelling and mathematical properties related to thermodynamics,
- Development of numerical simulation within an open-source code,
- Writing skills, ability to formulate a scientific project, publish and promote research,
- Ability to work in a team/collaboratively/on multidisciplinary projects.
Scientific contact:#
BRESH Didier
didier.bresch@univ-smb.fr
https://dbresch.wordpress.com/Applications have to be submited throught the university portal:
https://univ-smb.nous-recrutons.fr/poste/bx5bq7xamv-chercheur-post-doctorant-hf-mathinvo/
