I have completed a PhD thesis on two-phase flows entitled "Physical modelling of interactions between interfaces and turbulence". at CEA-Grenoble and IMF-Toulouse. This thesis deals with the study of interactions between coherent strutures like vortex and fully deformable bubbles. These interactions strongly impact the flow properties. Unfortunately, Direct Numerical Simulations (DNS) have to entail a number of degrees of freedom proportional to the third power of the Reynolds number to correctly describe the flow behaviour. This extremely hard constraint makes it impossible to use DNS for industrial applications. Our strategy consists in using and improving DNS method in order to develop the Interfaces and Subgrid Scales concept. ISS is a two-phase equivalent to the single-phase Large Eddy Simulation (LES) concept. The challenge of ISS is to integrate the two-way coupling phenomenon into subgrid models.
For more details, you can download the whole thesis only "en français" and the slideshow of the defense.
This simulation is performed using TrioCFD software. Combining a homogeneous isotropic turbulence simulation with a single bubble simulation allows us to study the interactions between interface and turbulence. The red and blue isovalues represent the turbulent structures (Q criterion). The color scale on the bubble surface represents the curvature of the interface.
During my postdoc, I was
working on Lattice Boltzmann Method in the
Reactive Flows and Turbulence Team at the Institute Jean Le Rond
D'Alembert, UPMC Paris. More specifically, I developed a surface
acoustic impedance condition for LBM. The reduction of noise
emissions is known to be one of the key issues of turbofan engines
development. With the development of land transports such as high
speed trains, the level of emmited noise becomes a more general
issue. Most of recent railway station are already provided by noise
barriers and acoustic treatments. Physically, these laminar liners
are composed of porous sheets with backing air cavities. The design
of these panels is difficult and expensive. Consequently, numerical
simulations are a usefull toll. This work was funded by a 1-year
postdoc grant of the organization ADEME. It was a collaboration with PowerFlow. I spent several months in the company in Boston,
Last Modified: July, 2025
