waveTransmissive

Description

The waveTransmissive is a general boundary condition that provides a wave transmissive outflow condition, based on solving DDt(W, field) = 0 at the boundary, W is the wave velocity and field is the field to which this boundary condition is applied.

The wave speed is calculated using:

$$w_p = \frac{\phi_p}{|\vec{S}_f|} + \sqrt{\frac{\gamma}{\psi_p}}$$

where:

Property	Description
$w_p$	Patch wave speed
$\phi_p$	Patch face flux
$\psi_p$	Patch compressibility
$\vec{S}_f$	Patch face area vector
$\gamma$	Ratio of specific heats

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            waveTransmissive;
    gamma           <scalar>;

    // Optional entries
    psi             <word>;

    // Inherited entries
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: waveTransmissive	word	yes	-
gamma	Ratio of specific heats	scalar	yes	-
psi	Name of compressibility field	word	no	thermo:psi

The inherited entries are elaborated in:

• advective

Further information

Tutorial:

• prism

Source code:

• waveTransmissive

API:

• Foam::waveTransmissiveFvPatchField

History: Introduced in version 1.5