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|出版社:||國立中興大學工學院;Airiti Press Inc.|
The characteristics of flow field in the potential region of finite amplitude standing waves are investigated experimentally for Ursell number ranging from 0.46 to 40.0. flow visualization technique and fiber laser Doppler velocimeter (FLDV) was used , respectively, for qualitative observation and quantitative measurement. According to linear standing was theory, the nodes and anti-nodes are fixed points in the space of wave field and the nodes just locate at the still wave level. These specific points, on the contrary, are found to be not fixed in the flow field of wave flume experiment, due to tiny period differences of incident waves generated by a precise wave maker. Therefore, the method which was used to determine the spatial distributions of the highest, lowest, and mean water levels in the finite amplitude standing waves was proposed first. The positions of the maximum and minimum was heights were then determined. The characteristics of the time histories and spectra of the water surface elevation as well as the underlying horizontal and vertical velocities, measured along three sections, are elucidated in detail. Moreover, the characteristics of frequency doubling and subharmonic frequency in the time histories and spectra of both the water surface elevation and the vertical velocity, measured along vertical at the position of the minimum wave height, are depicted. Finally, the profiles of extreme values of the horizontal and vertical velocities below the will water level are also demonstrated in this work.
|Appears in Collections:||第13卷 第3期|
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