Reacting Flows

Reacting Flows

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  3. Why does convergence with the EDM combustion model become poorer when changing turbulence models from k-epsilon to SST?

Why does convergence with the EDM combustion model become poorer when changing turbulence models from k-epsilon to SST?

Tagged: 16, cfx, Eddy Dissipation, fluid-dynamics, Reacting Flows, Species/Reactions
    • March 17, 2023 at 8:59 am
      FAQFAQ
      Participant

      In the EDM model, the source term is proportional to epsilon. Switching to the SST model, the rate becomes proportional to omega in the region near the wall. Due to turbulence modelling, omega can have very high values and make convergence more difficult. To avoid this, activate the Mixing Rate Limiter under ->Domain->Fluid Models -> Combustion Models->Mixing Rate Limit. The default value is 2500 [s^-1]. This is a good value for gas combustion.

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