Prof. François Avellan

Prof. François Avellan Full Professor

In 1977, Prof. François Avellan graduated in Hydraulic Engineering at the INPG Ecole Nationale Supérieure d'Hydraulique, Grenoble France, and, in 1980, got his Doctoral Degree in Engineering from the University of Aix-Marseille II, France, at IMST, the Institut de mécanique statistique de la turbulence, CNRS Associate Laboratory. In 1980, he is joining the EPFL Laboratory of Fluid Mechanics as Research Associate and, in 1984; he is appointed Senior Research Associate at the newly created EPFL Institute of Hydraulic Machines and Fluid Mechanics for leading the Research Group in Cavitation.
Since 1994, he is Director of the EPFL Laboratory for Hydraulic Machines and he was appointed Ordinary Professor in 2003.
In 2001, Prof. François Avellan was elected Head of the Mechanical Engineering Department and he was appointed Deputy Dean of the new EPFL School of Engineering from 2002 to 2006. Since 2004, He is the chair of the EPFL Steering Committee for High Performance Computing and, in 2010; is appointed Director of the EPFL Institute of Mechanical Engineering.
His main research interests are the hydrodynamics of turbines, pumps and pump-turbines, including cavitation, hydro-acoustics, design and evaluation of the performance of hydraulic machines trough both experimental investigations and numerical simulations. Since 2002, Prof. F. Avellan is the Chairman of the IAHR Section on Hydraulic Machinery and Systems.
Honorary Doctorate of the Polytechnic University of Bucharest, Romania, in October 2003, Prof. François Avellan has been awarded "Grand Prix d'Hydrotechnique 2010" by the Société Hydrotechnique de France.

 

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Sciences Naturelles et de l'Ingénieur

Large-Eddy Simulations of High Reynolds Number Incompressible Flow in Turbomachines

Prof. François Avellan
Full Professor
30 August 2011

Numerical flow simulations of complex unsteady hydrodynamics phenomena experienced by hydraulic turbomachines operating at off design conditions require advanced turbulence models for being able to investigate and to control phenomena like flow separation, rotating stall, rotor-stator interactions and cavitation. Recent progresses of both turbulence modeling and high performance computing lead us to investigate up-to-date Large-Eddy Simulation (LES) of unsteady turbulent flows with respect to available experimental results corresponding to both basic and industrial study cases. However, the geometrical complexity of the computing domain featuring rotating sub-domains and, as well, the large value of the Reynolds number requires a huge computing power. Therefore, an efficient implementation of either full LES software or hybrid LES – Reynolds Averaged Navier-Stokes software needs to be investigated in massively parallel computer architectures such as the EPFL IBM BlueGene/P supercomputer. Finally, the turbulent flow simulations will be validated with experimental data.