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Neumann boundary condition

    • Meyzeeh
      Subscriber

      Hi everyone 

      How does one set the diffusion flux equal to zero at the inlets and outlets as a boundary condition to create a closed system in the species model instead of specifying mass fraction? or does fluent assume this condition if you haven't clicked the inlet diffusion option? 

    • SRP
      Ansys Employee

      Hi,

      I suggest you to refer to fluent user's guide:7.4. Boundary Conditions (ansys.com) 

      This will help you to understand the diffudion flux boundary condition.

      Thank yoi.

    • Meyzeeh
      Subscriber

      Thank you for your reply. However, I didn't get the answer to my question after going through the suggested chapter. The only thing related to the question I found was that the boundary condition Im asking about is the default at the walls. Let me rephrase my question. Some problems at the inlet don't provide a specific species mass fraction (also called Dirichlet boundary condition) but they provide a specific mass flux (or Neumann boundary conditions). In this case, how can I add this mass flux in fluent since at the species option under velocity inlet there is only an option to add species mass fraction only?

    • Meyzeeh
      Subscriber

       

      Thank you very much. 

       

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