COMSOL 6.2 - Predefined Variables

Predefined Variables

This section lists some predefined variables that are available to evaluate heat fluxes, sources, and integral quantities used in energy balance. All the variable names begin with the physics interface name (the prefix). By default the Heat Transfer interface prefix is ht. As an example, you can access the variable named tflux using ht.tflux (as long as the physics interface is named ht).

Table 14-3: Heat Flux Variables.
Variable	Name	Geometric Entity level
dEiInt	Total Accumulated Heat Rate	Global
ntfluxInt	Total Net Heat Rate	Global
QInt	Total Heat Source	Global
WnsInt	Total Fluid Losses	Global
dEi0Int	Total Accumulated Energy Rate	Global
ntefluxInt	Total Net Energy Rate	Global
tflux	Total Heat Flux	Domains, boundaries
dflux	Conductive Heat Flux	Domains, boundaries
trlflux	Translational Heat Flux	Domains, boundaries
teflux	Total Energy Flux	Domains, boundaries
ntflux	Normal Total Heat Flux	Boundaries
ndflux	Normal Conductive Heat Flux	Boundaries
ncflux	Normal Convective Heat Flux	Boundaries
ntrlflux	Normal Translational Heat Flux	Boundaries
nteflux	Normal Total Energy Flux	Boundaries
ndflux_u	Internal Normal Conductive Heat Flux, Upside	Interior boundaries
ndflux_d	Internal Normal Conductive Heat Flux, Downside	Interior boundaries
ncflux_u	Internal Normal Convective Heat Flux, Upside	Interior boundaries
ncflux_d	Internal Normal Convective Heat Flux, Downside	Interior boundaries
ntrlflux_u	Internal Normal Translational Heat Flux, Upside	Interior boundaries
ntrlflux_d	Internal Normal Translational Heat Flux, Downside	Interior boundaries
ntflux_u	Internal Normal Total Heat Flux, Upside	Interior boundaries
ntflux_d	Internal Normal Total Heat Flux, Downside	Interior boundaries
nteflux_u	Internal Normal Total Energy Flux, Upside	Interior boundaries
nteflux_d	Internal Normal Total Energy Flux, Downside	Interior boundaries
Qtot	Domain Heat Sources	Domains
Qbtot	Boundary Heat Sources	Boundaries
Qltot	Line heat source (Line and Point Heat Sources)	Edges, Points (2D, 2D axial symmetry)
Qptot	Point heat source (Line and Point Heat Sources)	Points


	Some of these variables are only available with the Heat Transfer Module (rflux_u, rflux_d, rflux_z, q0_u, q0_d, and q0_z), or when either the CFD Module or the Heat Transfer Module is added (rflux and turbflux).