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. That is achieved by variation of both the length and the radius of the resonator. Keywords: bound states in the continuum, embedded trapped modes , cylindrical resonator, effective Hamiltonian (Some figures may appear ...
Abstract 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 ...
are first solved in the polar coordinate system for circular scatterers; then the models are extended to the cylindrical coordinate system with (semi-)infinitely long circular cylinders. The MSM ...
. This view of the kink (or sausage, or fluting) mode as a fast wave trapped in a low Alfvén speed waveguide will inform the interpretation of the numerical solutions obtained in the following sections. So ...
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