Bertrand Naud

Researcher at Ciemat. He presented his PhD in March 2003 at the faculty of Applied Physics, at Delft University of Technology (The Netherlands), about transported probability density function (PDF) modelling of turbulent combustion in gaseous and spray flames, using stochastic Lagrangian methods in the framework of the averaged Navier-Stokes equations (RANS).

During two post-doctoral projects at LITEC-CSIC in Zaragoza between March 2003 and July 2004, he could widen the research line opened during his PhD. Between March 2003 and July 2003, within the European project STOPP, he compared a Eulerian stochastic field method to the particle Lagrangian method, in order to resolve and model the scalar PDF transport equation. Between August 2003 and July 2004, within the European project LESSCO2, he started with Large Eddy Simulation (LES), considering the modelling of turbulent inlet conditions.

In October 2004, he joined the Fluid Mechanics and Combustion Modelling Group at Ciemat, where he could continue working on LES, and where he mainly came back to the research line opened during his PhD in the framework of RANS / transported PDF modelling. In particular, he took part to the study and comparison of different mixing models, to new developments about the modelling of the effect of droplets on the gaseous phase (two-way coupling) in turbulent sprays, to the modelling of swirl-stabilised flames, to the formulation of new Lagrangian models inducing the desired correlations between velocity and scalar fluctuations (including the implications for the modelling of the motion of small droplets in sprays), and to the development of a PDF model for pulverised coal combustion including radiation. He has also considered different ways to treat chemical reaction in transported PDF modelling, from detailed chemistry to different models based on laminar flamelets. In the last years, he has developed a tool to solve unsteady flamelets and generate flamelet libraries presuming the shape of the PDF.