Numerical simulations of reacting flows often rely on direct integration of the continuity and momentum
equations while transporting each chemical species and integrating their source term. However,
requirements on the grid size and time step to resolve all the relevant physics is not generally well defined.
In practice, information regarding convergence is gathered from the corresponding non-reacting
flow, one-dimensional laminar flame, and full convergence studies. The establishment of general criteria
or benchmarks relating convergence of these three aspects would decrease research and computational
effort performing detailed convergence studies and increase consistency in the literature. To support this
goal, studies were performed relating the convergence of the global flow field of a laminar reacting flow
to the convergence, in space and time, of the corresponding one-dimensional flame and non-reacting
flow. It was found that grid convergence of the global flow field was related to, but had more stringent
requirements than either of the two separate cases while the required time step was the same. These
results contribute to the development of satisfactory general criteria and benchmarks for determining
convergence across specific flow cases, chemical mechanisms, and numerical implementations