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Ultra-low-NOx combustors use reduced peak flame temperatures within the combustor to limit the formation of thermal NOx through staging strategies such as Lean Premixed combustion. As combustion temperatures are decreased in low NOx applications, designers must address other undesirable combustion phenomena, in particular the onset of combustion instability in the form of Lean Blow Off (LBO). Experimental methods to analyze LBO within the design cycle are too costly and time consuming given today’s time-to-market pressures. Using advanced combustion simulation tools instead, designers can leverage existing CFD data to initiate a simulation and evaluate how close the flame is to LBO. The speed and accuracy of this approach makes it easier for combustor designers to evaluate LBO behavior for different designs and operating conditions.