uniformMixed

Description

The uniformMixed is a boundary condition that provides 'mixed' type boundary condition that mix a uniform fixed value and a uniform patch-normal gradient condition. The term "uniform" is a legacy name since the prescribed values were previously spatially uniform across that patch.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            uniformMixed;

    // Optional entries
    uniformValue    <Function1<Type>>;
    uniformGradient <Function1<Type>>;

    // Conditional entries

        // if 'uniformValue' and 'uniformGradient' entries are set
        uniformValueFraction    <Function1<scalar>>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: uniformMixed	word	yes	-
uniformValue	Uniform fixed values	Function1<Type>	no	-
uniformGradient	Uniform gradient values	Function1<Type>	no	-
uniformValueFraction	Fraction values	Function1<scalar>	conditional	-

The inherited entries are elaborated in:

• fixedGradientFaPatchField.H
• Function1.H

• This boundary condition allows lazier definitions so that either

or both: `uniformValue` and `uniformGradient` must be defined.
If only of these entries is defined, the value fraction is automatically
treated appropriately (ie, 0 with \c uniformGradient and 1 with
`uniformValue`).
If both `uniformValue` and `uniformGradient` are defined,
the `uniformValueFraction` must also be defined.

• The value entry (optional) is used for the initial values.

Otherwise the function(s) are used for the evaluation.
In some cases (eg, coded or expression entries with references to other
fields) this can be problematic and the `value` entry will be needed.

Further information

Tutorial:

• N/A

Source code:

• uniformMixed

API:

• Foam::uniformMixedFaPatchField

History: Introduced in version v2306