Computational Grids
Complex Geometries and Fields
CAD Creation - Parametric Design
 

Large Eddy Simulation (LES)

CENTAUR has been used to create meshes for LES cases involving complex geometries. The ability to easily create large, high quality meshes is key to successful LES applications. CENTAUR also allows for the minimum element volume to be explicitly controlled thus preventing time scale limitations imposed by small elements. Parallel mesh generation allows for the large meshes needed for LES to be generated in a reasonable time. Some examples of successful LES runs performed using CENTAUR grids are shown below.

For more information on the technical features of CENTAUR, please see the Grid Generator section of our web site.

All images are courtesy of CERFACS.

 

Annular Combustion Chamber Instabilities

A mesh containing 336 million tetrahedra (55 million points) was used to simulate the combustion instabilities present in the annular combustion chamber of a helicopter engine. The image shows the flame colored by the velocity magnitude.1

Reference: P. Wolf, G. Staffelbach, R. Balakrishnan, A. Roux, and T. Poinsot. Azimuthal instabilities in annular combustion chambers. In Proceedings of the Summer Program, Center for Turbulence Research, NASA AMES, Stanford University, USA, 2010.

This research used resources of the Argonne Leadership Computing Facility at Argonne National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under contract DE-AC02-06CH11357.


Gas Turbine Engine Ignition Sequence

This image represents the flame propagation when during ignition in the annular combustion chamber of a helicopter engine with 18 burners. It is a two phase flow Large Eddy Simulation performed on 2048 cores using a containing 19 million elements (3.1 million points).

Reference: M. Boileau, G. Staffelbach, B. Cuenot, T. Poinsot, and C. BĂ©rat. LES of an ignition sequence in a gas turbine engine. Combustion and Flame, 154(1-2):2-22, 2008.

Ramjet Combustor

Large Eddy Simulation of the reactive flow in a twin-inlet ramjet configuration to study combustion instabilities and flow characteristics. This simulation was performed using a mesh with 5 million elements (910,000 points).

Reference: A. Roux, L.Y.M. Gicquel, S. Reichstadt, N. Bertier, G. Staffelbach, F. Vuillot and T. Poinsot. Analysis of unsteady reacting flows and impact of chemistry description in large eddy simulations of side-dumps ramjet combustors. Combustion and Flame 157 (1):176-191, 2010.