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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:

Further information

Tutorial:

Source code:

API:

History:

  • Introduced in version v2106