Abstract
Trapped modes in the linearized water wave problem are localized free oscillations in an unbounded fluid with a free surface. For sometime, it has been known that certain structures, fixed or freely floating, can support such modes. In this paper, we consider the problem on a channel, which consists of a finite part and two cylindrical outlets into infinity. The finite (bounded) part may contain some submerged and/or surface-piercing bodies. Since the ordinary scattering matrix can by no means contribute any information on trapped modes, we introduce the fictitious scattering operator and present a criterion for the existence of trapped modes. The criterion states that the number of trapped modes is the difference of the multiplicities of the eigenvalue 1 of the fictitious scattering operator and the eigenvalue −i of the scattering matrix.
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Nazarov, S.A., Ruotsalainen, K.M. Criteria for trapped modes in a cranked channel with fixed and freely floating bodies. Z. Angew. Math. Phys. 65, 977–1002 (2014). https://doi.org/10.1007/s00033-013-0386-1
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DOI: https://doi.org/10.1007/s00033-013-0386-1