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[Python/1D] Detect blowoff of burner-stabilized flames
For burner-stabilized flames under blowoff conditions (laminar flame speed less than burner velocity), the solver can get stuck regridding indefinitely due to the dependence of the calculated flame speed on the grid spacing (where the calculated flame speed is artificially high when the grid is coarse). To obtain solutions more quickly in this case, we check to see if the flame has moved off of the burner surface (i.e. zero temperature gradient at the burner) and if so, jump ahead to the non-reacting solution throughout the domain. Fixes #386
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