prghPermeableAlphaTotalPressure

Description

The prghPermeableAlphaTotalPressure is a is a mixed boundary condition for the p_rgh variable in multiphase flows.

It switches between an open boundary using the prghTotalPressure boundary condition and a wall condition using the fixedFluxPressure boundary condition.

In the prghPermeableAlphaTotalPressure, an open condition is applied when alpha is under a user-defined alphaMin value and a wall condition is applied when alpha is larger than the alphaMin.

This boundary condition can be used in conjunction with pressurePermeableAlphaInletOutletVelocity for the U variable.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            prghPermeableAlphaTotalPressure;
    p               <PatchFunction1<scalar>>;

    // Optional entries
    phi             <word>;
    rho             <word>;
    U               <word>;
    alpha           <word>;
    alphaMin        <scalar>;

    // Inherited entries;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: prghPermeableAlphaTotalPressure	word	yes	-
p	Total pressure	PatchFunction1<scalar>	yes	-
phi	Name of flux field	word	no	phi
rho	Name of density field	word	no	rho
U	Name of velocity field	word	no	U
alpha	Name of mixture field	word	no	alpha
alphaMin	Minimum value of alpha	scalar	no	1

The inherited entries are elaborated in:

• Foam::mixedFvPatchField
• Foam::PatchFunction1

Further information

Tutorial:

• damBreakPermeable

Source code:

• prghPermeableAlphaTotalPressure

API:

• Foam::prghPermeableAlphaTotalPressureFvPatchScalarField

History: Introduced in version v2106