24-002 Direct Numerical Simulation of Boil-off in
Il y a 2 mois
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Propulsion
**Mission**:
Recently, as part of an ANR for which I am the coordinator (ANR JCJC CAPLH2) with CNES as a partner, we focused on simulating the phenomenon of self-pressurisation due to boiling in sloshed LH2 cryogenic tanks. In fact, the direct numerical simulations (DNS) of sloshed cryogenic tanks are of major interest for obtaining a better understanding of the physical phenomena within the tank, despite their high computational cost. The majority of studies describe the system using 0D or 1D thermodynamic budgets, which are often only valid for a static reservoir, and can rarely give unsteady profiles or local information on the variables describing the flow or thermodynamics. It is possible to carry out LES simulations of sloshed tanks, but the phase change is often considered with important approximation with constants that need to be adjusted (Lee's model for example).
This simulation is a first step towards a better understanding of the boil-off phenomenon and the influence of the sloshing on it. However, several improvements in numerical methods are required to describe these physical phenomena more realistically.
**Objectives**
The aim of this thesis is to continue this work by improving the description of the thermodynamics and to analyse the results obtained using DNS of a sloshed cryogenic tank configuration under microgravity conditions. New models or corrections to existing models in the literature will be proposed, based on the DNS results obtained.
**Expected results**
First of all, a microgravity configuration is envisaged to match space conditions. The previous simulation incorporated gravity. In microgravity conditions, the liquid-solid contact angle must be properly considered because it can have an influence on the flow. The implementation of a low contact angle is envisaged for the forthcoming thesis, corresponding to a cryogenic fluid contact angle. In addition, we would like to carry out a parametric study with different heat fluxes entering the tank to evaluate different pressurisation regimes.Further validation of the thermodynamics is also required: we plan to integrate real fluid-type equations of state (e.g. Peng Robinson equation). This change may introduce changes in the compressible formalism, but will provide a better description of thermodynamic equilibria, particularly at the liquid-gas interface. New validations will be carried out during the thesis on this aspect.Finally, we plan to study and propose corrections to the phase change models frequently used in these configurations (Lee or Schrage model) based on the DNS database. Depending on the results obtained, it may also be possible to propose a new phenomenological models, better suited to LES/RANS simulations.
[1] L.G. Martinez et al. A new DNS formalism dedicated to turbulent two-phase flows with phase change, IJMF. 143 (2021) 103762.
[2] L.G. Martinez, et al., Vapor mixing in turbulent vaporizing flows, IJMF. 161 (2023) 104388.
=================
**Profil**:
Master in Mechanical Engineering (fluid mechanics), Physics, Energy
**LABO**:
LABO : CORIA
**Message de PhD**:
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