fixedNormalInletOutletVelocity

Description

The fixedNormalInletOutletVelocity is a velocity boundary condition that combines a fixed normal component obtained from the normalVelocity patch field supplied with a fixed or zero-gradiented tangential component.

The tangential component is set depending on the direction of the flow and the setting of fixTangentialInflow keyword:

• Outflow: apply zero-gradient condition to tangential components.
• Inflow:

- `fixTangentialInflow` is true: apply value provided by the `normalVelocity`
patch field to the tangential components,
- `fixTangentialInflow` is false: apply zero-gradient condition to
tangential components.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type                    fixedNormalInletOutletVelocity;
    fixTangentialInflow     <bool>;
    normalVelocity          <fvPatchVectorField>;

    //
    // normalVelocity
    // {
    //     type            uniformFixedValue;
    //     uniformValue    sine;
    //     uniformValueCoeffs
    //     {
    //         frequency 1;
    //         amplitude table
    //         (
    //             (0  0)
    //             (2  0.088)
    //             (8  0.088)
    //         );
    //         scale     (0 1 0);
    //         level     (0 0 0);
    //     }
    // }


    // Optional entries
    phi             <word>;

    // Inherited entries;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: fixedNormalInletOutletVelocity	word	yes	-
phi	Name of flux field	word	no	phi
fixTangentialInflow	Flag to fix the tangential component for inflow	bool	yes	-
normalVelocity	Boundary condition that provides the normal component of the velocity	fvPatchVectorField	yes	-

The inherited entries are elaborated in:

• Foam::fvPatchField
• Foam::directionMixedFvPatchField

Further information

Tutorial:

• oscillatingBox

Source code:

• fixedNormalInletOutletVelocity

API:

• Foam::fixedNormalInletOutletVelocityFvPatchVectorField

History: Introduced in version 2.3.1