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:

The inherited entries are elaborated in:

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

Further information🔗

Tutorial:

• $FOAM_TUTORIALS/verificationAndValidation/atmosphericModels/atmFlatTerrain

Source code:

• $FOAM_SRC/atmosphericModels/derivedFvPatchFields/wallFunctions/atmAlphatkWallFunction

API:

• Foam::atmAlphatkWallFunctionFvPatchScalarField

History:

• Introduced in version v2006