Industrial gas turbines constitute an integral part of today’s electricalpower production infrastructure. Reacting gas flows in these machines arevery interesting and complex in nature since they exhibit highly turbulentbehaviour which is strongly coupled to the chemical reaction dynamics.Thus developing accurate CFD models for such flows while keeping thecomputational expense reasonable is a non-trivial task. In this studyLarge-Eddy simulations of hydrogen-methane fuel mixture combustion inthe SGT800’s (Siemens Energy Gas turbine 800) burner, in atmosphericconditions are performed using the CFD code Starccm+ (versions 16.04and 16.06).