How can I get the conductive heat loss and convective heat loss separately?

[617283443]

Hi experts!
I want to get the conductive,convective,radiative heat loss of a wall.In the Fluent I can get the total heat transfer rate and the radiation heat transfer rate,How can I get the conductive heat loss and convective heat loss separately?
Thank you in advance!

[Mark O]

There are no built-in tools for that. You can only subtract the radiation from the total to get the convection + diffusion. You can create a named expression for the gradient of temperature such as gradT = gradient(T), which will then give you the variables gradT.mag, gradT.x, gradT.y, gradT.z. 

[617283443]

Thank you very much for your reply!Could you elaborate on whether it involves writing a UDF at the boundary where  conductive heat loss and convective heat loss need to be extracted?

[Mark O]

You do not need a UDF. You create a named expression. Any named expression that is a function of a solution variable becomes another solution variable. The conductive flux in some direction is the conductivity multiplied by the temperature gradient in the same direction. See the Fluent user guide section on Fluent Expressions Language.