supersonicFreestream

Description

The supersonicFreestream is a boundary condition that provides a supersonic free-stream condition.

• supersonic inflow is assumed to occur according to the Prandtl-Meyer expansion process.
• subsonic outflow is applied via a zero-gradient condition from inside the domain.

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            supersonicFreestream;
    UInf            <vector>;
    pInf            <scalar>;
    TInf            <scalar>;
    gamma           <scalar>;

    // Optional entries
    T               <word>;
    p               <word>;
    psi             <word>;

    // Inherited entries;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: supersonicFreestream	word	yes	-
UInf	Freestream velocity	vector	yes	-
pInf	Freestream pressure	vector	yes	-
TInf	Freestream temperature	vector	yes	-
gamma	Heat capacity ratio	scalar	yes	-
T	Name of temperature field	word	no	T
p	Name of pressure field	word	no	p
psi	Name of compressibility field	word	no	thermo:psi

The inherited entries are elaborated in:

• Foam::mixedFvPatchField

Further information

Tutorial:

• nacaAirfoil

Source code:

• supersonicFreestream

API:

• Foam::supersonicFreestreamFvPatchVectorField

History: Introduced in version 1.5