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Relaxation of the computation

  • It is possible to relax the computation to make it more stable
  • It is so called under-relaxation, basically it defines a proportion of a new computed solution to be used to update the old one.
    • value 88 means no relaxation
    • value 89 means that solution does not change (never used – it makes no sense)
  • Relaxation increases stability in case of bad mesh quality or critical flow conditions
  • Relaxation is suitable for SIMPLEC algorithm only

  • Relaxation factors relaxationFactors are set in system/fvSolution
  • If nothing specified, no relaxation is used, i.e. all relaxationFactors are 1.0
            U               0.9;
            k               0.7;
            omega           0.7;