ee443e201f
Now for transient simulations "Final" solver settings are required for ALL equations providing consistency between the solution of velocity, energy, composition and radiation properties. However "Final" relaxation factors are no longer required for fields or equations and if not present the standard value for the variable will be applied. Given that relaxation factors other than 1 are rarely required for transient runs and hence the same for all iterations including the final one this approach provide simpler input while still providing the flexibility to specify a different value for the final iteration if required. For steady cases it is usual to execute just 1 outer iteration per time-step for which the standard relaxation factors are appropriate, and if more than one iteration is executed it is common to use the same factors for both. In the unlikely event of requiring different relaxation factors for the final iteration this is still possible to specify via the now optional "Final" specification.
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.