Abstract
The appearance of resonant phenomena in which the resonant force spectrums appear with sharp peaks due to interaction between waves and two rectangular cylinders with small gap has been indicated both numerically and theoretically in our previous paper1) . This resonance should be considered in the construction of large offshore structure connecting with many rectangular unites.This paper presents more details of the numerical calculation methods and the theoretical derivation, and newly shows the following characteristics of resonant phenomena; 1) The resonant phenomena appear only in the cases that two rectangular cylinders come very close. Especially, in the case of square cylinders, the resonance dose not happens when the gap width is longer than 8 percent of the gap length. 2) Non-dimensional resonant wave numbers are regardless of incident wave angles.
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