Full Text:   <2667>

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CLC number: U661.32

On-line Access: 2015-12-04

Received: 2015-01-20

Revision Accepted: 2015-08-22

Crosschecked: 2015-11-27

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Citations:  Bibtex RefMan EndNote GB/T7714


Chao-bang Yao


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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.12 P.987-1000


Modeling of fluid resonance in-between two floating structures in close proximity

Author(s):  Chao-bang Yao, Wen-cai Dong

Affiliation(s):  Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan 430033, China

Corresponding email(s):   hgycb2004111@163.com, haigongdwc@163.com

Key Words:  Fluid resonance, Water wave, Boundary element method, Artificial damping forces, Sloshing mode

Chao-bang Yao, Wen-cai Dong. Modeling of fluid resonance in-between two floating structures in close proximity[J]. Journal of Zhejiang University Science A, 2015, 16(12): 987-1000.

@article{title="Modeling of fluid resonance in-between two floating structures in close proximity",
author="Chao-bang Yao, Wen-cai Dong",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Modeling of fluid resonance in-between two floating structures in close proximity
%A Chao-bang Yao
%A Wen-cai Dong
%J Journal of Zhejiang University SCIENCE A
%V 16
%N 12
%P 987-1000
%@ 1673-565X
%D 2015
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500017

T1 - Modeling of fluid resonance in-between two floating structures in close proximity
A1 - Chao-bang Yao
A1 - Wen-cai Dong
J0 - Journal of Zhejiang University Science A
VL - 16
IS - 12
SP - 987
EP - 1000
%@ 1673-565X
Y1 - 2015
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1500017

In this study, we conducted numerical simulations of fluid resonance in-between two floating structures based on potential theory assessing the effect of fluid viscosity by including the artificial damping force. The numerical results of two adjacent Barges systems and Barge & Wigley systems were compared with experimental data of those of the viscous fluid model based on Reynolds average Navier-Stokes equations (RANSE). It can be observed that the conventional potential flow model (without artificial damping force) significantly over-estimated the wave height and forces around the resonant frequencies. Results of the present method with an appropriate damping coefficient supported the available data, confirming the importance of the viscous damping effect on strong hydrodynamic interaction between the floating structures. Furthermore, influences of lateral clearances, wave heading angles, and ships’ motions on the wave surface elevations were analyzed. Validation and application of methods to estimate the fluid resonant frequencies and modes were also conducted. Generally speaking, Molin’s simplified theory can give an accurate estimation of resonant frequencies and serve as a practical tool to analyze the fluid resonant phenomena of gaps in-between a two Barge system and Wigley & Barge system in close proximity.

The problem presented in the paper is an important issue for the hydrodynamics between two floating structures, which has been studied over 30 years, either by 2D or 3D theory, with or without speed.


方法:1. 通过理论分析,在三维线性势流理论基础上,引入流体"粘性耗散"(公式2、10~12、18和19)以准确模拟近距两浮体波浪中的水动力及浮体间液面抬升;2. 采用雷诺应力平均方程(RANSE)方法或试验方法确定"粘性耗散系数"(图2和3);3. 采用数值计算和理论分析的方法给出近距两浮体间的流体共振模式(图8)及共振频率估算方法(公式21~ 25)。
结论:1. 采用三维线性势流理论并引入流体"粘性耗散系数"可较为准确地计算得到近距两浮体波浪作用下的受力及浮体间液面抬升;"粘性耗散系数"可通过RANSE方法或试验方法获得;2. 相比于其它因素(浪向角等), 近距两浮体间的干扰效应受横向间距影响较大;3. 采用类似于"月池"中流体共振频率分析方法获得的共振频率计算公式可用于估算近距两浮体间的流体共振频率,同时不同共振频率时浮体间的流体共振模式得到了数值计算结果的验证。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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