alphatWallFunction

Description

The alphatWallFunction is a boundary condition that provides provides a turbulent thermal diffusivity condition when using wall functions.

The turbulent thermal diffusivity calculated using:

$$\alpha_t = \frac{\mu_t}{Pr_t}$$

where:

Property	Description
$\alpha_t$	Turbulence thermal diffusivity
$\mu_t$	Turbulence viscosity
$Pr_t$	Turbulent Prandtl number

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            compressible::alphatWallFunction;

    // Optional entries
    Prt             <scalar>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: compressible::alphatWallFunction	word	yes	-
Prt	Turbulent Prandtl number	scalar	no	0.85

The inherited entries are elaborated in:

• fixedValueFvPatchField.H

Further information

Tutorial:

• roomWithThickCeiling

Source code:

• alphatWallFunction

API:

• Foam::compressible::alphatWallFunctionFvPatchScalarField

History: Introduced in version v2206