nutURoughWallFunction

Description

The nutURoughWallFunction is boundary condition that provides a wall function on the turbulent viscosity (i.e. nut) based on velocity (i.e. U) for low- and high-Reynolds number applications for rough walls.

Usage

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

Boundary file

<patchName>
{
    type            wall;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type                nutURoughWallFunction;
    roughnessHeight     <scalar>;
    roughnessConstant   <scalar>;
    roughnessFactor     <scalar>;

    // Optional entries
    maxIter             <label>;
    tolerance           <scalar>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: nutURoughWallFunction	word	yes	-
roughnessHeight	Roughness height	scalar	yes	-
roughnessConstant	Roughness constant	scalar	yes	-
roughnessFactor	Scaling factor	scalar	yes	-
maxIter	Number of Newton-Raphson iterations	label	no	10
tolerance	Convergence tolerance	scalar	no	0.0001

The inherited entries are elaborated in:

• nutWallFunctionFvPatchScalarField.H

• Suffers from non-exact restart since correctNut() (called through turbulence->validate) returns a slightly different value every time it is called. See nutUSpaldingWallFunctionFvPatchScalarField.C.

Further information

Tutorial:

• N/A

Source code:

• nutURoughWallFunction

API:

• Foam::nutURoughWallFunctionFvPatchScalarField

History: Introduced in version 2.4.0