The acousticWaveTransmissive boundary condition provides a wave transmissive outflow condition by solving the following governing equation at the boundary:

\[\frac{D \, W f}{D t} = 0\]

where \(W\) represents the wave speed and \(f\) corresponds to the field to which this boundary condition is applied.


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

Boundary file

    type                patch;

Field file

    // Mandatory entries
    type                acousticWaveTransmissive;
    advectiveSpeed      <scalar>;

    // Inherited entries
Property Description Type Required Default
type Type name: acousticWaveTransmissive word yes -
advectiveSpeed Advective speed value scalar yes -

The inherited entries are elaborated in:

Further information


Source code:


  • Introduced in version 1.5