Context
Compressible multiphase flows play a key role in a large number of engineering applications for the energy and transport sectors.The physical modeling of these flows faces numerous obstacles, due to the difficulty of modeling heat and mass transfers between phases, the wide variation in thermodynamic properties and the complex interaction with turbulence, all in the presence of strong pressure waves or shock waves.
Accurate prediction by numerical simulation is a real challenge, even for simple geometries, due to the difficulty of modeling the interfacial exchanges, thermodynamic processes and small-scale turbulence interacting with two-phase structures. These complex interactions lead to a wide range of flow topologies that standard turbulence and mass transfer models formulated within the RANS one-fluid approach are unable to predict correctly.This thesis aims to contribute to the modeling of compressible multiphase problems related to energy systems by carrying out high-fidelity simulations of representative configurations. The goal is to develop a large-scale numerical approach in the presence of a phase transition. Different stages are proposed:
- Develop a one-velocity large-scale approach. Implement and validate the WALE subgrid model;
- Propose a closure for the subgrid term appearing in the equation for the gas volume fraction (based on a turbulent Schmidt number);
- Implement an implicit approach (ILES);
- Carry out high-fidelity simulations of representative configurations to analyze and better understand physical phenomena, enabling us to improve the design and life- time of energy systems.
Application information
Laboratory: institut Pprime.
Profile: Master 2 or engineering degree in fluid mechanics. Knowledge in compressible numerical methods and computer science (programming, processing of large volumes of data) would be appreciated.
