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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:

Source code:

API:

History:

  • Introduced in version v2206