Alan Burlot Email & Phone Number

Paris, France

Multiphase flows physical and numerical modelling, mainly for boiling flows.I co-supervise several PhD students and internships every year. Subjects concern single- and two-phase flows numerical modeling with a strong part of physics analysis.I develop in C++ in the open-source TrioCFD code to enhance its capacities. I also perform advance post-processing with Python to analyse numerical results.

Paris Area, France

I studied the interaction between internal and external aerodynamics to evaluate the fan blades behavior in high bypass ratio engines.• Tools: - CFD: elsA software - Meshing tools: Autogrid, ICEM

Paris Area, France

• Subject: Study and modelling of unstably stratified homogeneous turbulence.• Main results:- Development of a two-points closure model in spectral space to investigate turbulent regime at high Reynolds number (~10⁶)- Characterization of the late time self-similar regime: influence of the large-scale distribution, inertial range scaling, anisotropy- Validation of the results against highly resolved direct numerical simulations (2048³ points)- Large parametric study using our spectral model to test turbulence models for engineer applications- Study of variable acceleration effects on the turbulent mixing dynamic- 3 posters, 5 publications and 10 oral talks• Context: Turbulent mixing induced by density contrast is a major phenomenon occurring in geophysical flows (e.g. cirrus clouds formation), engineering applications (e.g. inertial confinement fusion) and astrophysical flows (e.g. supernova explosion). The typical configuration of density-induced mixing is the flow which develops with a Rayleigh-Taylor instability. This flow is extremely complex due to inhomogeneity, anisotropy and compressibility effects. One major results, known for three decades, is that a turbulence regime takes place at late time and drives the mixing zone. In order to investigate this particular phase, we studied a canonical flow called unstably stratified homogeneous turbulence. The purpose of this simplification is to keep the main characteristics of the Rayleigh-Taylor turbulence, namely anisotropy and buoyancy effects, and discarding others difficulties, namely inhomogeneity and incompressibility. Through this idealized configuration, we tried to understand the mechanism operating in the turbulent mixing.• Defended on December 9, 2015

Grenoble Area, France

• Location: Alstom Power Hydro R&D Center in Grenoble.• Subject: Modeling of the flow around a Kaplan turbine to characterize the hub gaps impact on the turbine yield.• Context: The particularity of Kaplan turbine is the possibility to rotate the blades in order to maximize the yield. The blade angle depends on the flow and the hydraulic head. Allowing the blades to rotate force to cut the blade near the hub. This cut is performed at a specific angle corresponding to the optimal yield. But, due to the cylindrical and conical shape of some parts of the hub, the blade rotation creates gaps between the blade and the hub. This small space (~1 mm) was considered negligible compared to the blade diameter (> 1 m) and so not studied numerically. It was in fact hard to mesh this area. But some experiments shown that it may be necessary to take it into account. My job was to set up a first modeling protocol to investigate this problem. • Main results: - Validation of experimental results - Identification of the gaps impact on the draft tube yield - Preliminary study on cavitation induced by the hub gaps• Tools: - CFD modeling: Ansys CFX - Mesh tool: Autogrid, ICEM

Grenoble Area, France

• Subject: Numerical simulation of cavitation in an unsteady and compressible flow.• Results: - Investigation of a compressibility law for the liquid phase ; - Clear effects on the cavitation development with interaction among compressibility, turbulence and limit conditions.• Context: Cavitation occurs when the flow pressure changes to a certain value which lead to the formation of vapor bubbles. It can be visible in several engineering applications (e.g. the propeller of a submarine, the pump in a rocket engine) and even in nature (e.g. the pistol shrimp). Most of the time, cavitation is a problem and damages the pump or turbine. Therefore, the prediction of its appearance is a major concern in industrial applications. My job in the laboratory felt within this global question through fundamental aspects as compressibility effects.• Tool: internal CFD code (in Fortran) developed in LEGI.

Rennes Area, France

• Subject: Validation of dredged sand clean-up operation.• Context: Due to heavy industrial activity, the port of Dunkerque regularly needs to dredge sand in order to maintain the boat circulation. Those industries are allowed to reject some heavy metals as aluminum or mercury. Usually, the dredged sand is relocated further in the sea but due to the metal pollution, they need to be cleaned-up first. To do so, the sand is usually stored and washed onshore. Tests are periodically performed to control the decontamination process. My job consisted in gathering the different test results and validating the clean-up operation.• Results:- Synthesis report addressed to the client- Additional work: partial translation of the European water law• Tools: Microsoft Word & Excel.

Doctor Of Philosophy - Phd, Fluid Mechanics, With Honours

Study and modeling of unstably stratified homogeneous turbulence.

Master Of Philosophy, Philosophy Of Science, With Honours (Mention Très Bien)

Philosophy of biology, Carnap, philosophy of technology, ethics, philosophy of numerical simulation.

Master Of Science (M.Sc.), Mechanical Engineering, With Honours (Mention Bien)

Activities and Societies: Bureau des élèves

Pcsi/Psi