|Yesterday, 11:18 PM||#61|
Join Date: Sep 2003
Those graphs assume wave propagation follows spherical geometry irrespective of what is happening around it. Fluid dynamics isn't so simple. Each wavefront alters the pressure gradient along its boundary, and this slightly distorts the geometry of another wavefront crossing it.
For typical designs and reasonably spaced drivers this is negligible and interference occurs very close to simple models. But when drivers are tightly spaced and there are dozens of them, those slight distortions add up and become significant.
It isn't that interference doesn't occur, but rather that the coalescence to a unified wavefront occurs closer than simple models predict and the wavefront farfield is more uniform than predicted.
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