A conservative low Mach number predictor-corrector projection scheme is presented, and used to study reacting flow in a doubly-periodic "closed" domain. The stagnation pressure is computed with an integral constraint that allows a conservative update of the density field using the non-conservative energy equation and the continuity equation. A two-dimensional premixed flame interation with a counter-rotating vortex pair is studied to examine the mutual effects of unsteady flow and reaction at the flame front. Flame consumption and displacement speeds are reported and their correlations with tangential strain rate and curvature are compared to available data. A superadiabatic condition is observed behind the flame due to the pressure rise in the domain. The implications for flame response to the flow field are studied, revealing significant deviation from one-dimensional stagnation flame behaviour.
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