Full Text:   <2164>

CLC number: O353.2

On-line Access: 2008-04-15

Received: 2007-09-26

Revision Accepted: 2008-01-14

Crosschecked: 0000-00-00

Cited: 2

Clicked: 3515

Citations:  Bibtex RefMan EndNote GB/T7714

-   Go to

Article info.
1. Reference List
Open peer comments

Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.5 P.654~663

http://doi.org/10.1631/jzus.A0720016


Hydrodynamic coefficients of a simplified floating system of gravity cage in waves


Author(s):  Chang-wen WU, Fu-kun GUI, Yu-cheng LI, Wei-huan FANG

Affiliation(s):  Marine Science School, Zhejiang Ocean University, Zhoushan 316000, China; more

Corresponding email(s):   gui2237@163.com

Key Words:  Gravity cage, Floating system, Hydrodynamic coefficients, Waves


Chang-wen WU, Fu-kun GUI, Yu-cheng LI, Wei-huan FANG. Hydrodynamic coefficients of a simplified floating system of gravity cage in waves[J]. Journal of Zhejiang University Science A, 2008, 9(5): 654~663.

@article{title="Hydrodynamic coefficients of a simplified floating system of gravity cage in waves",
author="Chang-wen WU, Fu-kun GUI, Yu-cheng LI, Wei-huan FANG",
journal="Journal of Zhejiang University Science A",
volume="9",
number="5",
pages="654~663",
year="2008",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0720016"
}

%0 Journal Article
%T Hydrodynamic coefficients of a simplified floating system of gravity cage in waves
%A Chang-wen WU
%A Fu-kun GUI
%A Yu-cheng LI
%A Wei-huan FANG
%J Journal of Zhejiang University SCIENCE A
%V 9
%N 5
%P 654~663
%@ 1673-565X
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0720016

TY - JOUR
T1 - Hydrodynamic coefficients of a simplified floating system of gravity cage in waves
A1 - Chang-wen WU
A1 - Fu-kun GUI
A1 - Yu-cheng LI
A1 - Wei-huan FANG
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 5
SP - 654
EP - 663
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0720016


Abstract: 
Numerical simulation and experimental tests were carried out to examine the hydrodynamic behaviors of a double-column floating system of gravity cage under wave conditions. A floating system of gravity cage can be treated as a small-sized floating structure when compared with the wavelengths. The main problem in calculating the wave loads on the small-sized floating structure is to obtain the reasonable force coefficients, which may differ from a submerged structure. In this paper, the floating system of gravity cage is simplified to a 2D problem, where the floating system is set symmetrically under wave conditions. The motion equations were deduced under wave conditions and a specific method was proposed to resolve the problem of wave forces acting on a small-sized floating system of gravity cage at water surface. Results of the numerical method were compared with those from model tests and the hydrodynamic coefficients Cn and C were studied. It is found that Cn ranges from 0.6 to 1.0 while C is between 0.4 and 0.6 in this study. The results are useful for research on the hydrodynamic behavior of the deep-water gravity sea cages.

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

Reference

[1] Brebbia, C.A., Walker, S., 1979. Dynamic Analysis of Offshore Structure. Newnes-Butterworths, London, England, p.109-143.

[2] Feng, T.C., 1996. Wave exciting forces on floats. Ocean Engineering, 14(3):36-40 (in Chinese).

[3] Fredriksson, D.W., Decew, J.C., Tsukrov, I., 2007. Development of structural modeling techniques for evaluating HDPE plastic net pens used in marine aquaculture. Ocean Engineering, 34(16):2124-2137.

[4] Garrett, C.J.R., 1971. Wave forces on a circular dock. Journal of Fluid Mechanics, 46(1):129-139.

[5] Gou, Y., Teng, B., Ning, D.Z., 2004. Interaction effects between wave and two connected floating bodies. Engineering Science, 6(7):75-80 (in Chinese).

[6] Hamel, D.D., 1992. Forces on vertical rectangular cylinder in wavy flow and in combined wave and current flow at low KC number. OMAE A, (1992):293-298.

[7] Hou, E.H., Gao, Q.L., 1998. Theory and Design of Fishing Gear. The Ocean Press, Beijing, China, p.41-47 (in Chinese).

[8] Huang, C.C., Tang, H.J., Liu, J.Y., 2006. Dynamical analysis of net cage structures for marine aquaculture: Numerical simulation and model testing. Aquacultural Engineering, 35(3):258-270.

[9] Huang, C.C., Tang, H.J., Liu, J.Y., 2007. Modeling volume deformation in gravity-type cages with distributed bottom weights or a rigid tube-sinker. Aquacultural Engineering, 37(2):144-157.

[10] Jia, S.H., 1987. Rigid Body Dynamics. Higher Education Press, Beijing, China, p.153-157 (in Chinese).

[11] Li, Y.C., 1989. Wave Action on Maritime Structures. The Press of Dalian University of Technology, Dalian, China, p.144-145.

[12] Li, Y.C., He, M., 1994. Forces on rectangular cylinder of small size in combined wave and current flow. China Offshore Platform, 9(Z1):293-298 (in Chinese).

[13] Miles, J., Gilbert, F., 1968. Scattering of gravity waves by a circular dock. Journal of Fluid Mechanics, 34(4):783-793.

[14] Sabuncu, T., Calisal, S., 1981. Hydrodynamic coefficients for vertical circular cylinders at finite depth. Ocean Engineering, 8(1):25-63.

[15] Sulisz, W., Johansson, M., 1992. Second order wave loading on a horizontal rectangular cylinder of substantial draught. Applied Ocean Research, 14(6):333-340.

[16] Takagi, T., Suzuki, K., Hiraishi, T., 2002. Development of the numerical simulation method of dynamic fishing net shape. Nippon Suisan Gakkaishi, 68(3):320-326.

[17] Takagi, T., Shimizu, T., Suzuki, K., Hiraishi, T., Yamamoto, K., 2004. Validity and layout of “NaLA”: a net configuration and loading analysis system. Fisheries Research, 66(2-3):235-243.

[18] Wang, E.G., 1995. Mechanics of Fishing Gear. Dalian Fisheries University, Dalian, China, p.33-36 (in Chinese).

[19] Yeung, R.W., 1981. Added mass and damping of a vertical cylinder in finite-depth waters. Applied Ocean Research, 3(3):119-133.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

Please provide your name, email address and a comment





Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - Journal of Zhejiang University-SCIENCE