variableHeightFlowRateInletVelocity

Description

The variableHeightFlowRateInletVelocity is a boundary condition that provides a velocity boundary condition for multphase flow based on a user-specified volumetric flow rate.

The flow rate is made proportional to the phase fraction alpha at each face of the patch and alpha is ensured to be bound between 0 and 1.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            variableHeightFlowRateInletVelocity;
    flowRate        <Function1<scalar>>;
    alpha           <word>;

    // Inherited entries;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: variableHeightFlowRateInletVelocity	word	yes	-
flowRate	Volumetric flow rate [m^3/s]	Function1<scalar>	yes	-
alpha	Name of phase-fraction field	word	no	alpha

The inherited entries are elaborated in:

• fixedValueFvPatchField.H
• Function1.H

• The value is positive into the domain.
• The condition may not work correctly for transonic inlets.
• Strange behaviour with potentialFoam since the momentum equation is not solved.

Further information

Tutorial:

• weirOverflow

Source code:

• variableHeightFlowRateInletVelocity

API:

• Foam::variableHeightFlowRateInletVelocityFvPatchVectorField

History: Introduced in version 2.1.1