Calculation of diffusive species flux at wall boundaries with fixed species mass fraction (Fluent)

    • MarkusP

      Dear Fluent experts,

      in the diffusive flux expression for species in Fluent, the diffusion coefficient is multiplied with the density and the gradient of species mass fraction to obtain the diffusive flux (neglecting thermal diffusion).

      How is this expression for the diffusive flux evaluated if I specify a fixed value boundary condition for species on a wall (especially density and mass fraction gradient)? How is the density value calculated for the wall (if density obeys the ideal-gas law)?

      Thanks in advance,

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