Fluids

Fluids

When to use mass-weighted average quantity

    • roytorc
      Subscriber
      Could anyone let me know when to use a mass-weighted average. I'm calculating average value of scalar dissipation rate. Is it suitable?n
    • Rob
      Ansys Employee
      We use mass and area weighted depending on what's needed. nFor an outlet temperature (flow boundary) I'd use mass weighted. On a wall surface for temperature I'd use area weighted. n
    • Abubakar
      Subscriber
      Hi Rob, nCan't we use in a reverse way? nThank you,nAbu Bakar kha
    • Rob
      Ansys Employee
      Please explain, I'm not sure what you mean. n
    • Abubakar
      Subscriber
      I mean to say that is it ok if I am using an area-weighted average for flow boundary and the mass-weighted average for wall surfacen
    • Rob
      Ansys Employee
      You can use those. However, how will area average account for a small region that's going very quickly when checking the mean temperature or species passing though a plane? n
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