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The aim of this paper is to gain an improved understanding of the processes that influence the lean premixed combustion of natural gas in a gas turbine combustor and to examine the capability of a URANS/LES approach and of detailed chemistry for the prediction of turbulent swirling flows. Emphasis is put on the investigation of the instability on the reaction zone, flame stabilization mechanism and turbulence-chemistry interaction. The test case simulated in the present work is the G30 dry low emission combustor of SIEMENS-Lincoln. This is a real-size industrial burner that operates at a thermal power of 1MW. In order to understand the behavior of the burner under low and high pressure conditions several experimental measurements are available, like PIV for the velocity field and OH* chemiluminescence (CL) for detecting the distribution of the combustion zone. NomenclatureC D1 = EDC model constant: 0.134 C D2 = EDC model constant: 0.5 C LES = EDC model constant for the calculation of the fine scale: 0.6 k = turbulent kinetic energy L νK = von Karman length scale L t = turbulent length scale Q SST-SAS = SAS term Δ = local grid size ε = turbulent dissipation γ* = length of the fine scale η = Kolmogorov scale κ = SAS model constant: 0.41 ν = molecular viscosity ν T = turbulent viscosity ω = turbulent specific dissipation σ ϕ = SAS model constant: 0.667 τ* = residence time scale in the fine structures ζ = SAS model constant: 3.51

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