Gabriel Staffelbach

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Recent advances in computer science and highly parallel algorithms make Large Eddy Simulation (LES) an efficient tool for the study of complex flows. The available resources allow today to tackle full complex geometries that can not be installed in laboratory facilities. The present paper demonstrates that the state of the art in LES and computer science(More)
Turbulence is a recurrent and recognised challenge for which the scientific community has not been able to provide reliable methodologies necessary for predictions in complex industrial applications. In fact and throughout the past century, that challenge has been identified as a million dollar achievement simply because of the tremendous impact such a(More)
Large Eddy Simulations (LES) of a full annular helicopter gas turbine combustor have been performed. Emphasis is placed on the azimuthal mode that often appears in real configurations. The current LES are shown to capture these self-excited modes, with limited impact of the grid resolution. The structure of the azimuthal mode is discussed and shown to be(More)
Recent developments in numerical schemes, turbulent combustion models and the regular increase of computing power allow Large Eddy Simulation (LES) to be applied to real industrial burners. In this paper, two types of LES in complex geometry combustors and of specific interest for aeronautical gas turbine burners are reviewed: (1) laboratory-scale(More)
The objectives of this paper are the description of azimuthal instability modes found in annular combustion chambers using two numerical tools: (1) Large Eddy Simulation (LES) methods and (2) acoustic solvers. These strong combustion instabilities are difficult to study experimentally and the present study is based on a LES of a full aeronautical combustion(More)
This report presents a joint experimental and numerical study of the non-reacting flow in a swirler where small geometrical variations are imposed on a row of holes. Simulation results are compared to experimental data in terms of mean and Root Mean Square (RMS) velocity fields as well as in terms of unsteady activity (e.g. hydrodynamic modes such as the(More)
This study describes a simple analytical method to compute the azimuthal modes appearing in annular combustion chambers and help analyzing experimental, acoustic and LES (Large Eddy Simulation) data obtained in these combustion chambers. It is based on a one-dimensional zero Mach number formulation where N burners are connected to a single annular chamber.(More)
Combustion is the source of eighty percent of the energy produced in the world: it is therefore a topic of major interest in the present context of global warming and decreasing fuel resources. Simulating combustors and especially instability mechanisms in these systems has become a central issue in the combustion community in the last ten years. This can(More)