atmBoundaryLayerInletVelocity

Description

The atmBoundaryLayerInletVelocity is a boundary condition that provides a log-law type ground-normal inlet boundary condition for the streamwise component of wind velocity (i.e. u) for homogeneous, two-dimensional, dry-air, equilibrium and neutral atmospheric boundary layer modelling.

The ground-normal streamwise flow speed profile expression:

$$u = \frac{u^*}{\kappa} \ln \left( \frac{z - d + z_0}{z_0} \right)$$ $$v = w = 0$$

where:

Property	Description
$u$	Ground-normal streamwise flow speed profile [m/s]
$v$	Spanwise flow speed [m/s]
$w$	Ground-normal flow speed [m/s]
$u^*$	Friction velocity [m/s]
$\kappa$	von Kármán constant [-]
$z$	Ground-normal coordinate component [m]
$d$	Ground-normal displacement height [m]
$z_0$	Aerodynamic roughness length [m]

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            atmBoundaryLayerInletVelocity;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: atmBoundaryLayerInletVelocity	word	yes	-

The inherited entries are elaborated in:

• atmBoundaryLayer.H
• inletOutletFvPatchField.H

Further information

Tutorial:

• turbineSiting

Source code:

• atmBoundaryLayerInletVelocity

API:

• Foam::atmBoundaryLayerInletVelocityFvPatchVectorField

History: Introduced in version v1806