Learning Forum

[roytorc]

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]

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]

Hi Rob, nCan't we use in a reverse way? nThank you,nAbu Bakar kha

[Rob]

Please explain, I'm not sure what you mean. n

[Abubakar]

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]

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