쇄파가 수중 수평판의 고립파 제어에 미치는 영향

Effects of Wave Breaking over Submerged Horizontal Plate on Solitary Wave Control

A numerical analysis was performed to analyze the solitary wave control mechanism of a submerged horizontal plate (SHP). A two-dimensional numerical wave tank (NWT), which uses a wave generation method that generates a stable solitary wave, was employed for the numerical analysis. To verify the effectiveness of the NWT, the waveform measured around the SHP was compared to the calculated waveform. Moreover, the approximate and the calculated waveforms were compared in order to examine whether the solitary wave was stably generated. The results of comparison and verification showed that the deformation of the solitary wave by SHP was reproduced with high accuracy in the calculation, while the calculated waveform of NWT also showed a high degree of matching with the approximate waveform. The solitary wave breaking on the SHP satisfied the existing threshold condition A 0 /h c > 0.827-0.833, but breaking did not occur even under the condition A 0 /h c ＝1.2 when the width of the SHP was small. Accordingly, the wave height attenuation of the solitary wave occurred rapidly in a breaking condition. In a non-breaking condition, the energy gradually decreased due to the vorticity and turbulence around the boundary of the SHP, resulting in a gradual attenuation of the solitary wave.