Summary: Center for Turbulence Research
Annual Research Briefs 2001
Large-eddy simulation of gas turbine combustors
By Krishnan Mahesh , George Constantinescu, Sourabh Apte, Gianluca
Iaccarino AND Parviz Moin
1. Motivation and objectives
This report discusses our progress towards developing a numerical algorithm, and solver
capable of performing large-eddy simulation in geometries as complex as the combustor of
a gas-turbine engine. LES is considered a particularly attractive approach for combustor
simulation because of its demonstrated superiority over RANS in predicting mixing. A
working combustor the PW6000 is chosen to develop and demonstrate LES capability.
As discussed in previous reports (Mahesh et al. 1999, 2000), an algorithm and LES
solver for unstructured grids are under development.
Our progress in the last year is as follows:
· A new formulation was derived that is discretely energy-conserving for arbitrary
grids. This was found essential to perform simulations at high Reynolds numbers, and on
`bad' grids encountered in complex geometries such as the Pratt & Whitney combustor.
· Turbulent validations were performed for the swirling flow in a coaxial combustor