Mass conservation and singular multicomponent diffusion algorithms

  title={Mass conservation and singular multicomponent diffusion algorithms},
  author={Vincent Giovangigli},
  journal={IMPACT Comput. Sci. Eng.},
We investigate mass conservation in multicomponent diffusion algorithms. Usual diffusion matrices are indeed singular, i.e., noninvertible, because of mass conservation constraints. A consequence is that when all mass fractions are treated as independent unknowns-a widely used approach in complex chemistry reacting flow solvers-artificial singularities may appear in the governing equations. These singularities arise, for instance, with species flux boundary conditions or with steady flows… CONTINUE READING

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