Description🔗

The fixedMeanOutletInlet is a general boundary condition that extrapolates field to the patch using the near-cell values and adjusts the distribution to match the specified, optionally time-varying, mean value. This extrapolated field is applied as a fixedValue for outflow faces but zeroGradient is applied to inflow faces.

This boundary condition can be applied to pressure when inletOutlet is applied to the velocity so that a zeroGradient condition is applied to the pressure at inflow faces where the velocity is specified to avoid an unphysical over-specification of the set of boundary conditions.

Usage🔗

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

Boundary file🔗

<patchName>
{
    type            patch;
    ...
}

Field file🔗

<patchName>
{
    // Mandatory entries
    type            fixedMeanOutletInlet;
    meanValue       <Function1<Type>>;

    // Optional entries
    phi             <word>;

    // Inherited entries;
    ...
}

where:

The inherited entries are elaborated in:

• Foam::outletInletFvPatchField
• Foam::Function1

Further information🔗

Tutorial:

• N/A

Source code:

• $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/fixedMeanOutletInlet

API:

• Foam::fixedMeanOutletInletFvPatchField

History:

• Introduced in version v1806