OpenFOAM Documentation - gradientEnergy

Description🔗

The gradientEnergy is a boundary condition that provides a gradient condition for internal energy.

The gradient is calculated using:

\[\nabla(e_p) = \nabla_\perp C_p(p, T) + \frac{e_p - e_c}{\Delta}\]

where:

Property	Description
$e_p$	Energy at patch faces [J]
$e_c$	Energy at patch internal cells [J]
$p$	Pressure [bar]
$T$	Temperature [K]
$C_p$	Specific heat [J/kg/K]
$\Delta$	Distance between patch face and internal cell centres [m]

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

<patchName>
{
    type            patch;
    ...
}

<patchName>
{
    // Mandatory entries
    type            gradientEnergy;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
`type`	Type name: `gradientEnergy` `	word	yes	-

The inherited entries are elaborated in:

Tutorial:

Source code:

API:

History:

Property	Description
\(e_p\)	Energy at patch faces [J]
\(e_c\)	Energy at patch internal cells [J]
\(p\)	Pressure [bar]
\(T\)	Temperature [K]
\(C_p\)	Specific heat [J/kg/K]
\(\Delta\)	Distance between patch face and internal cell centres [m]