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Description

The atmBoundaryLayerInletEpsilon is a boundary condition that provides a log-law type ground-normal inlet boundary condition for the turbulent kinetic energy dissipation rate (i.e. epsilon) for homogeneous, two-dimensional, dry-air, equilibrium and neutral atmospheric boundary layer modelling.

The ground-normal epsilon profile expression:

\[\epsilon = \frac{(u^*)^3}{\kappa (z - d + z_0)} \sqrt{C_1 \ln \left( \frac{z - d + z_0}{z_0} \right) + C_2}\]

where:

Property Description
\(\epsilon\) Ground-normal TKE dissipation rate profile [m^2/s^3]
\(u^*\) Friction velocity [m/s]
\(\kappa\) von Kármán constant [-]
\(z\) Ground-normal coordinate component [m]
\(z_0\) Aerodynamic roughness length [m]
\(d\) Ground-normal displacement height [m]
\(C_1\) Curve-fitting coefficient for YGCJ profiles [-]
\(C_2\) Curve-fitting coefficient for YGCJ profiles [-]

Usage

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

Boundary file 

<patchName>
{
    type            patch;
    ...
}

Field file 

<patchName>
{
    // Mandatory entries
    type            atmBoundaryLayerInletEpsilon;

    // Inherited entries
    ...
}

where:

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

The inherited entries are elaborated in:

  • atmBoundaryLayer.H
  • inletOutletFvPatchField.H

Further information

Tutorial:

Source code:

API:

History:

  • Introduced in version v1806