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The FOAM file format has not changed from version 2.0 in many years and so there is no longer a need for the 'version' entry in the FoamFile header to be required and to reduce unnecessary clutter it is now optional, defaulting to the current file format 2.0.
Stiff chemistry solver validation test cases gri : GRI-Mech 3.0. CH4 combustion, 53 species, 325 reactions h2 : H2 combustion, 10 species, 27 reactions nc7h16 : n-Heptane combustion, 544 species, 2446 reactions ic8h18 : iso-Octane combustion, 874 species, 3796 reactions Results interpreted in 'validation' sub-directory, where OpenFOAM results are compared against those predicted by CHEMKIN II. Overall the best performing ODE solver is seulex followed closely by rodas23.