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Conditions and Phase Shift of Fluid Resonance in Narrow Gaps of Bottom Mounted Caissons
作者姓名:ZHU Da-tong  WANG Xing-gang  LIU Qing-jun
作者单位:Jiao Zhuan Research Center, Southeast University, Nanjing 210018, China,Nanjing Hydraulic Research Institute, Nanjing 210029, China;Key Laboratory of Port, Waterway and Sedimentation Engineering of the Ministry of Transport, Nanjing 210029, China,Nanjing Hydraulic Research Institute, Nanjing 210029, China;College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
基金项目:This study was financially supported by the National Key R & D Program of China (Grant No. 2017YFC0405402).
摘    要:This paper studies the viscid and inviscid fluid resonance in gaps of bottom mounted caissons on the basis of the plane wave hypothesis and full wave model. The theoretical analysis and the numerical results demonstrate that the condition for the appearance of fluid resonance in narrow gaps is kh=(2n+1)π (n=0, 1, 2, 3, …), rather than kh=nπ (n=0, 1, 2, 3, …); the transmission peaks in viscid fluid are related to the resonance peaks in the gaps. k and h stand for the wave number and the gap length. The combination of the plane wave hypothesis or the full wave model with the local viscosity model can accurately determine the heights and the locations of the resonance peaks. The upper bound for the appearance of fluid resonance in gaps is 2b/L<1 (2b, grating constant; L, wave length) and the lower bound is h/b≤1. The main reason for the phase shift of the resonance peaks is the inductive factors. The number of resonance peaks in the spectrum curve is dependent on the ratio of the gap length to the grating constant. The heights and the positions of the resonance peaks predicted by the present models agree well with the experimental data.

关 键 词:gap  resonance  phase  shift  of  resonance  peak  fluid  local  viscosity  model  plane  wave  hypothesis  full  wave  model  bottom  mounted  caissons
收稿时间:2016/12/20 0:00:00
修稿时间:2017/3/6 0:00:00

Conditions and Phase Shift of Fluid Resonance in Narrow Gaps of Bottom Mounted Caissons
ZHU Da-tong,WANG Xing-gang,LIU Qing-jun.Conditions and Phase Shift of Fluid Resonance in Narrow Gaps of Bottom Mounted Caissons[J].Ocean Engineering,2017(6):724-735.
Authors:ZHU Da-tong  WANG Xing-gang and LIU Qing-jun
Institution:Jiao Zhuan Research Center, Southeast University, Nanjing 210018, China,Nanjing Hydraulic Research Institute, Nanjing 210029, China;Key Laboratory of Port, Waterway and Sedimentation Engineering of the Ministry of Transport, Nanjing 210029, China and Nanjing Hydraulic Research Institute, Nanjing 210029, China;College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
Abstract:
Keywords:gap resonance  phase shift of resonance peak  fluid local viscosity model  plane wave hypothesis  full wave model  bottom mounted caissons
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