The ANR ODEVIE project aims to provide an in-depth understanding of the geochemical reactions occurring in the environment of deep hydrothermal vents. Indeed, life could have originated on Earth in deep hydrothermal springs at the bottom of the oceans. The mechanisms of complexification of matter by prebiotic chemistry via geocatalytic reactions are indeed possible in these environments with strong gradients (thermal, chemical, etc.). In order to study these systems at the laboratory scale, the proposed postdoctoral topic will be devoted to the study of the thermo-hydro-geochemical reactivity of model hydrothermal fluids flowing inside microfluidic chips. These ones aim to reproduce the complexity of a porous geometry simulating deep hydrothermal vents.
To do this, we will propose numerical simulations of the behavior of these compressible fluids in micro-systems with the Notus computational code (https: // notus-cfd.org) developed in the I2M laboratory. The first step will consist in considering a single-phase transcritical flow of water with dissolved gases in the micro-system. The large variability of the thermophysical properties will be taken into account by the available compressible model, specially developed for hydrodynamic flow near the critical point. A 3D simulation with a resolution up to the Kolmogorov scale will be performed to obtain an accurate thermal and chemical mapping of the microchip. The validation will be done by comparison with experimental mappings. A particular effort will be necessary to propose an efficient numerical strategy to perform the simulation on several thousands of processors with such a compressible model. In a second step, depending on the thermodynamic results obtained by the project partners, a realistic two-phase flow in 3D consisting of water and gas will be considered. Indeed, under certain conditions, it is possible to observe the appearance of phases. Simulations will be carried out using a diffuse interface model to take into account the mass transfer between phases.
The simulations will be compared to the experimental results of the partners obtained with advanced micro-experimental tools (micro and milli-reactors high pressure / high temperature) and with in situ (micro spectroscopy) and ex situ (chromatography) characterization tools.
Skills : c
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Duration : 18 monthsSelection process
Contact : firstname.lastname@example.org and email@example.comWeb site for additional job details
https: // notus-cfd.orgOffer Requirements
Engineering: PhD or equivalentSkills/Qualifications
Computational fluids dynamics, thermodynamics. Skills on diffuse interface methods as well as experience in development (Fortran 2008) and massively parallel simulations will be particularly appreciated.Contact Information