filmHeightInletVelocity

Description

The filmHeightInletVelocity is boundary condition designed to be used in conjunction with surface film modelling. It provides a velocity inlet boundary condition for patches where the film height is specified. The inflow velocity is obtained from the flux with a direction normal to the patch faces using:

$$\u_p = \frac{\vec{n} \phi}{\rho |\vec{S}_f| \delta}$$

where:

Property	Description
$\u_p$	Patch velocity [m/s]
$\vec{n}$	Patch normal vector
$\phi$	Mass flux [kg/s]
$\rho$	Density [kg/m^3]
$\vec{S}_f$	Patch face area vectors [m^2]
$\delta$	Film height [m]

Usage

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

Boundary file

<patchName>
{
    type            wall;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            filmHeightInletVelocity;

    // Optional entries
    phi             <word>;
    rho             <word>;
    deltaf          <word>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: filmHeightInletVelocity	word	yes	-
phi	Name of flux field	word	yes	-
rho	Name of density field	word	yes	-
deltaf	Name of height field	word	yes	-

The inherited entries are elaborated in:

• fixedValueFvPatchField.H

Further information

Tutorial:

• N/A

Source code:

• filmHeightInletVelocity

API:

• Foam::filmHeightInletVelocityFvPatchVectorField

History: Introduced in version 2.0.0