atmAlphatWallFunction

Description

The atmAlphatWallFunction is a boundary condition that provides a wall constraint on the kinematic turbulent thermal conductivity (i.e. alphat) for atmospheric boundary layer modelling. It assumes a logarithmic distribution of the potential temperature within the first cell.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            atmAlphatWallFunction;
    Pr              <Function1<scalar>>;
    Prt             <PatchFunction1<scalar>>;
    z0              <PatchFunction1<scalar>>;

    // Optional entries
    Cmu             <scalar>;
    kappa           <scalar>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: atmAlphatWallFunction	word	yes	-
Pr	Molecular Prandtl number	Function1<scalar>	yes	-
Prt	Turbulent Prandtl number	PatchFunction1<scalar>	yes	-
z0	Surface roughness length [m]	PatchFunction1<scalar>	yes	-
Cmu	Empirical model constant	scalar	no	0.09
kappa	von Karman constant	scalar	no	0.41

The inherited entries are elaborated in:

• fixedValueFvPatchField.H
• Function1.H
• PatchFunction1.H

Further information

Tutorial:

• atmFlatTerrain

Source code:

• atmAlphatkWallFunction

API:

• Foam::atmAlphatkWallFunctionFvPatchScalarField

History: Introduced in version v2006