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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:

Further information

Tutorial:

  • N/A

Source code:

API:

History:

  • Introduced in version 1.6