The 1.6 kHz plot looks very much like the heat map you see when creating digital delay arc arrays of sources.
You can plot phase isocontours for the modelled frequencies in AKABAK, although the colour stepping wasn’t adjustable nor could be disabled last time I checked.
It might be useful to analyse those both for each individual source & how they combine to see how the wavefront is interacting with the horn walls. You can do that with several duplicated Field observations, changing the radiating elements that contribute to each of them.
I found that exporting an image of the section-cut plotted phase isocontours and marking out the edge transitions between colours using the Image Tracing function of Adobe Illustrator helped highlight the wavefront shape development. Essentially adding black outlines for each step of a 5-degrees or more:
The sudden transition from dark blue to red is where the scale has ‘run out’. That was from a model with a ground plane infinite baffle, so the isocontours highlight the phase shift as you move farther out from the centre of the vertical array.
One of the frustrating things with AKABAK is that it’s surprisingly difficult to calculate things like the acoustic impedance on a surface, virtual or otherwise. This is something that seems far easier in COMSOL or even ANSYS.
That would probably tell you a lot, but the ’best’ method I managed to find produced an obscene amount of ASCII data files which weren’t labelled in any sensible way that correlated to their position on the field plane.
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