Large Eddy Simulation (LES)


	Home Grid Generator Introduction Why Hybrid Grids Mesh Element Types Meshing Strategies Meshing Process Features Setup Prism Layers Hexahedral Layers Complex Geometries Mesh Resolution Control Automatic Sources Adapter 2D Hybrid Meshes CAD Multizones Structured Quad Layers Structured Hex Blocks Parallel Mesh Generation Overlapping Meshes All Tetrahedra Moving Hybrid Grids Batch Mode / Scripting Modular Mesh Generation Periodic Meshes Wake Meshes Actuator Disks Tools Redesign / Mesh Reuse Mesh Movement Modular Meshing Mesh Visualizer Mesh Quality Improvement Adapter Refinement Redistribution Surface Fidelity Formats - Platforms CAD Input Mesh Export Platforms Applications Aerospace Subsonic Aircraft 787 Dreamliner Wing-Body-Pylon-Nacelle High Lift Aircraft Supersonic Aircraft F16 Falcon Mirage 2000 X31 Aircraft X38 Crew Return Vehicle Helicopters BK117 Helicopter AH-64 Apache Turbomachinery Turbines Blade Seal Gas Turbine Blade with Cooling Holes Inlet Guide Vane Inlet Torus and Nozzle Ring Turbine Blade Compressors Centrifugal Compressor Inlet Volute Impeller Burners / Combustors Silo Combustor Burner Automotive Racing Car Sedan Air Conditioning Duct Marine Ship Hull with Screws Submarine Propeller Motorboat Sailboat Biomedical Arterial Bifurcation Environmental Wind Turbine Large Eddy Simulation-LES Products CENTAUR CENTAUR_Plus CENTAUR_Adapt Contact Us Support Problems / Questions Web Site Manual CAD GUI Grid Generator Grid Adapter

Applications > Large Eddy Simulation-LES

Applications

Aerospace

Turbomachinery

Automotive

Marine

Biomedical

Environmental

› Large Eddy Simulation-LES

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.

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.

Annular Combustion Chamber of a Helicopter Engine

Click on an image to enlarge.

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. Bérat. LES of an ignition sequence in a gas turbine engine. Combustion and Flame, 154(1-2):2-22, 2008.

Gas Turbine Ignition

Click on an image to enlarge.

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.

Ramjet

Click on an image to enlarge.