alphatFilmWallFunction

Description

The alphatFilmWallFunction is boundary condition that provides a turbulent thermal diffusivity condition when using wall functions, for use with surface film models. This condition varies from the standard wall function by taking into account any mass released from the film model.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            alphatFilmWallFunction;

    // Optional entries
    filmRegion      <word>;
    B               <scalar>;
    yPlusCrit       <scalar>;
    Cmu             <scalar>;
    kappa           <scalar>;
    Prt             <scalar>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: alphatFilmWallFunction	word	yes	-
B	B coefficient	scalar	no	5.5
yPlusCrit	y+ value for laminar -> turbulent transition	scalar	no	11.05
Cmu	Empirical model coefficient	scalar	no	0.09
kappa	von Karman constant	scalar	no	0.41
Prt	Turbulent Prandtl number	scalar	no	0.85

The inherited entries are elaborated in:

• fixedValueFvPatchField.H

Further information

Tutorial:

• hotBoxes

Source code:

• alphatFilmWallFunction

API:

• Foam::compressible::RASModels::alphatFilmWallFunctionFvPatchScalarField

History: Introduced in version 2.0.0