[Yadu krishnan]

What does the function BOUNDARY_HEAT_FLUX(f, thread) returns in a UDF used in fluent. Wall heat flux density(W/m2) or wall heat (W) ? Does it return total heat flux? To access local heat flux density(W/m2) of a single cell, How can I use this function?

[pakk]

Did you know that Fluent has a manual?

"You can use DEFINE_HEAT_FLUX to modify the heat flux at a wall. Despite the name, a DEFINE_HEAT_FLUX UDF is not the means to specify the actual heat flux entering a domain from the outside. To specify this type of heat flux, you would simply use a DEFINE_PROFILE function in conjunction with a heat flux thermal boundary condition. In contrast, a DEFINE_HEAT_FLUX UDF allows you to modify the way in which the dependence between the flux entering the domain and the wall and cell temperatures is modeled."