Fluids

Fluids

Reporting the diffusive UDS flux across a zone boundary surface

    • MarkusP
      Subscriber

      Dear FLUENT experts,


      does FLUENT provide any option to report the diffusive flux of a UDS across a fluid-solid boundary?


      Thanks,
      Markus

    • DrAmine
      Ansys Employee

      You require UDF to do that, as far as I know.

    • MarkusP
      Subscriber

      Thanks, Amine.


      How can I calculate the diffusive flux using a UDF?


      How can I find the right boundary surface within the UDF? 

    • DrAmine
      Ansys Employee

      Please refer to the customization manual where it does show how you can access a particular thread based on the thread of the boundary. Whenever you have that you need to make the dot product of the normal vector at the boundary with gradient of UDS times the diffusivity coefficient.


       

    • DrAmine
      Ansys Employee

      Also check the BOUNDARY FAce geometry macros as they might be helpful to you. You can approximate the fluxes in GUI by using the gradients of UDS and face area normals. How to access gradients is shown in the customization manual too. (under solve/set/expert..)

    • MarkusP
      Subscriber

      Thanks, Amine!


      Best regards,
      Markus

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