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Trapped modes of the Helmholtz equation are investigated in infinite, 2D acoustic waveguides with Neumann or Dirichlet walls. A robust boundary element scheme is used to study modes both inside and outside the continuous spectrum of propagating modes. An effective method for distinguishing between genuine trapped modes and spurious solutions induce...
The trapping of sound in a rectangular enclosure, such as a corridor or street, and the noise disturbance caused by trapping, can be a serious problem to understanding speech or other acoustic events. In contrast to confined systems that sustain so‐called trapped modes, the behavior in a partially open enclosure is associated with leaky modes of th...