The radiation from a port is a solution of the Helmholtz equations. For simplicity's sake we regard the process as the movement of an incompressable "block" of air. That approach makes the computations a lot easier, but it is not nearer the physical reality. The incompressability itself is a result of the Helmholtz solutions. At high pressure levels, where non-linear effects due to the air flow occur, the models you mentioned are to be preferred. Application of the Boundary Element method is limited to the linear case.
To simulate the behaviour of a duct or port using BEM, you must choose the Edge Length parameter small enough, so that details of the port geometry can be represented in te calculation. An Edge Length of half the wavelength will be far too great
regards,
Tom
To simulate the behaviour of a duct or port using BEM, you must choose the Edge Length parameter small enough, so that details of the port geometry can be represented in te calculation. An Edge Length of half the wavelength will be far too great
regards,
Tom