A wavePressure boundary condition has been added, and the Airy-type wave
models have been extended to generate the unsteady pressure field. This
provides another option for specifying wave motion at a boundary.
If a waveVelocity condition is used in isolation, then any outlet flow
will be extrapolated and scaled to match the required flow rate. This is
similar to how a flowRateOutletVelocity condition works.
0/U:
<patchName>
{
type waveVelocity;
// wave parameters ...
}
0/p_rgh:
<patchName>
{
type fixedFluxPressure;
}
If a waveVelocity is used in conjunction with the new wavePressure
condition, then one will set the value and the other the gradient, as
appropriate for the direction of the flow.
0/U:
<patchName>
{
type waveVelocity;
// wave parameters ...
p p_rgh;
}
0/p_rgh:
<patchName>
{
type wavePressure;
}
This new pressure-velocity formulation is less stable, but generates
more accurate waveforms on patches where the velocity reverses. It is
also necessary for sub-surface cases where fixing the velocity around
the entire domain generates a continuity error.
This work was supported by Alice Gillespie, on behalf of M3 Wave
d9fc7eb887