Incorrect values of laminar burning velocity can be obtained from the Solver for certain conditions. This will lead to either a discontinuity of the burning velocity, which can be observed in CFX Post, or to blow-out of the flame.
There are errors in the coding for equivalence ratios that are inside the 'Flammability Limits' and outside the 'Fit Range'. The following options are affected by the issue: the "Metghalchi and Keck" option for Laminar Burning Velocity and the "Quadratic Decay" and "Fifth Order Polynomial" options for Equivalence Ratio Correlation/Reference Burning Velocity.
Either specify the Laminar Burning Velocity in CEL or use the "Beta Function" option for Equivalence Ratio Correlation/Reference Burning Velocity.
ANSYS CFX Release 11.0 Update 1.