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difference between BOUNDARY_HEAT_FLUX(f,tf) and BOUNDARY_RAD_HEAT_FLUX(f,tf)
User wanted to use two macros but encountered some discrepancies between the udf results and what FLUENT prints in the GUI Report-Fluxes panel.
Two macros are available to get heat transfer rate. They are
Important thing to note here is that these macros return heat transfer rate in Watts and not W/m^2 as their name suggests (i.e. flux).
When using these macros in a udf, you should be aware of the following:
(1) BOUNDARY_HEAT_FLUX(f,tf) is the Total heat tansfer rate at the face as reported in Report-Fluxes panel in the GUI.
(2) BOUNDARY_RAD_HEAT_FLUX(f,tf) returns the Radiation heat transfer only.