fixedPressureCompressibleDensity

Description

The fixedPressureCompressibleDensity is a pressure boundary condition that calculates a (liquid) compressible density as a function of pressure and fluid properties.

The governing equations are as follows:

$$\rho = \rho_{l,sat} + \psi_l*(p - p_{sat})$$

where:

Property	Description
$\rho$	Density [kg/m^3]
$\rho_{l,sat}$	Saturation liquid density [kg/m^3]
$\psi_l$	Liquid compressibility [-]
$p$	Pressure [Pa]
$p_{sat}$	Saturation pressure [Pa]

The variables $\rho_{l,sat}, p_{sat}$ and $\psi_l$ are retrieved from the thermodynamicProperties dictionary.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            fixedPressureCompressibleDensity;

    // Optional entries
    p               <word>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: fixedPressureCompressibleDensity	word	yes	-
p	Name of pressure field	word	no	p

The inherited entries are elaborated in:

• Foam::fixedValueFvPatchField

Further information

Tutorial:

• N/A

Source code:

• fixedPressureCompressibleDensity

API:

• Foam::fixedPressureCompressibleDensityFvPatchScalarField

History: Introduced in version 1.6