January 25, 2023 at 7:17 amFAQParticipant
A very low inter species mass diffusivity can affect the convergence specially in regions with low turbulent diffusivity (viscosity). The diffusive part of the species transport equation can become extremely small compared to convective part and thus might create problems with convergence. A workaround can be to start with a higher laminar mass diffusivity for the species and then slowly drop it.
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