Generalized_Rad

Syntax

Bc Diffuse For Energy ([{of} SpeciesName] | [{in} MaterialPhaseName] | [{ls} {a | b | c}]) {@ | at | for | on | over} Mesh Extent Name ([Touching TouchingMeshExtent] | [Opposing OpposingMeshExtent]) = Generalized_Rad [Using Data Specification Data Spec Name] ([Power_Output = power_output] | [Flux_Output = flux_output] | [Toggle = toggle] | [Multiplier = multiplier] | [T_Ref = t_ref])

Summary

Radiative energy flux, with values for emissivity, form factor and irradiation taken from expressions

Description

Flux is:

M \epsilon f\left( \sigma T^4 - I \right)

M is MULTIPLIER. \sigma is the Stefan-Boltzmann constant. \epsilon and F are expressions for emissivity and form factor. T is surface temperature. I is the expression for irradiation. If I does not already exist, it will be constructed as \sigma T_{ref}^4, where T_{ref} is either provided by the BC Rad Reference Temperature expression or the inline T_{ref} parameter (constant or string function).

The following options are present in most boundary conditions/sources. The meaning of each option is as follows:

Power_Output

If specified, the total (integrated) power of the given BC/Src is calculated and stored into the global variable name specified as the power_output argument.

Flux_Output

If specified, the average flux of the given BC/Src is calculated and stored into the global variable name specified as the flux_output argument.

Toggle

If given, specifies which toggle block controls whether this BC is active or not.

Parameter

Value

Default

{of}

{of | species | subindex}

–

SpeciesName

string

–

{in}

{in | material_phase}

–

MaterialPhaseName

string

–

{ls}

{levelset_phase | ls}

–

Mesh Extent Name

string

–

TouchingMeshExtent

string

–

OpposingMeshExtent

string

–

Data Spec Name

string

–

power_output

“string”

–

flux_output

“string”

–

toggle

“string”

–

multiplier

real

1

t_ref

“string”

–