Boundary Fluxes (Heat Transfer Interface)
All the domain fluxes (vector quantity) computed by the Heat Transfer interface are also available as boundary fluxes. The boundary fluxes are then equal to the mean value of the fluxes on adjacent domains. In addition, normal boundary heat fluxes (scalar quantity) are available on boundaries.
Normal Total Heat Flux (Heat Transfer Interface)
The variable
ntflux
is defined as:
Normal Conductive Heat Flux (Heat Transfer Interface)
The variable
ndflux
is defined on exterior boundaries as:
•
ndflux
= −
dflux_spatial
(
T
)
if the adjacent domain is on the downside,
•
ndflux
= −
uflux_spatial
(
T
)
if the adjacent domain is on the upside,
and, on interior boundaries, as:
ndflux
= (
uflux_spatial
(
T
) −
dflux_spatial
(
T
))/
2
Frames for the Heat Transfer Equations
for a description of spatial and material frames.
Normal Convective Heat Flux (Heat Transfer Interface)
The variable
ncflux
is defined as:
Normal Total Energy Flux (Heat Transfer Interface)
The variable
nteflux
is defined as:
Normal Total Enthalpy Flux (Heat Transfer Interface)
The variable
nthflux
is defined as:
Inward Heat Flux (Heat Transfer Interface)
On external boundaries, the inward heat flux,
q0
, is a scalar quantity defined either in a general way or as a convective heat flux as follows:
where
T
ext
is the external temperature defined in the
Heat Flux
feature.
Radiative Heat Flux (Heat Transfer Interface)
On boundaries, the radiative heat flux,
rflux
, is a scalar quantity defined as:
where the terms account for surface-to-ambient radiative flux, surface-to-surface radiative flux, and radiation in participating net radiative flux, respectively.
