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research-article

Numerical study on the heading misalignment and current velocity reduction of a vessel-shaped offshore fish farm

[+] Author and Article Information
Lin Li

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway
lin.li@uis.no

Zhiyu Jiang

Department of Engineering Sciences, University of Agder, 4879 Grimstad, Norway; Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway
zhiyu.jiang@uia.no

Jungao Wang

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway
jungao.wang@uis.no

Muk Chen Ong

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway
muk.c.ong@uis.no

1Corresponding author.

ASME doi:10.1115/1.4042266 History: Received March 23, 2018; Revised December 03, 2018

Abstract

Recently, the concept of a vessel-shaped fish farm was proposed for open sea applications. The fish farm comprises a vessel-shaped floater, five fish cages, and a single-point mooring system. Such a system weathervanes, and this feature increases the spread area of fish waste. Still, the downstream cages may experience decreased exchange of water flow when the vessel heading is aligned with the current direction, and fish welfare may be jeopardized. To ameliorate the flow conditions, a dynamic positioning (DP) system may be required, and its power consumption should relate to the heading misalignment. This paper proposes an integrated method for predicting the heading misalignment between the vessel-shaped fish farm and the currents under combined waves and currents. A numerical model is first established for the fish farm system with flexible nets. Current reduction factors are included to address the reduction in flow velocity between net panels. The vessel heading is obtained by finding the equilibrium condition of the whole system under each combined wave and current condition. Then, the Kriging metamodel is applied to capture the relation between the misalignment angle and environmental variables, and the probability distribution of this misalignment angle is estimated for a reference site. Finally, the requirement for the DP system to improve the flow condition in the fish cages is discussed.

Copyright (c) 2018 by ASME
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