greyDiffusiveRadiation

Description

The greyDiffusiveRadiation is a boundary condition that provides a grey-diffuse condition for radiation intensity, I, for use with the finite-volume discrete-ordinates model (fvDOM), in which the radiation temperature is retrieved from the temperature field boundary condition.

An external radiative heat flux can be added using qRadExt. If qRadExtDir is specified, this ray closest to this direction is used. Otherwise, the face normal is used as direction to set qRadExt.

Usage

The condition requires entries in both the boundary and field files.

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            greyDiffusiveRadiation;

    // Optional entries
    T               <word>;
    qRadExt         <scalar>;
    qRadExtDir      <vector>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: greyDiffusiveRadiation	word	yes	-
T	Name of temperature field	word	no	T
qRadExt	Radiative external flux	scalar	no	0
qRadExtDir	Radiative external flux direction	vector	no	Zero

The inherited entries are elaborated in:

• mixedFvPatchFields.H

Further information

Tutorial:

• smallPoolFire2D

Source code:

• greyDiffusiveRadiation

API:

• Foam::radiation::greyDiffusiveRadiationMixedFvPatchScalarField

History: Introduced in version 1.6