Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Numerical analysis of resistance and dynamic behavior of gravity cage involving multiple cages of the same internal volume

내부용적이 동일한 여러 개 가두리의 저항과 동적거동에 대한 해석

  • CHOI, Kyu-Suk (Department of Fisheries Physics, Pukyong National University) ;
  • LEE, Chun-Woo (Department of Marine Production System Management, Pukyong National University) ;
  • LEE, Da-Yoon (Department of Fisheries Physics, Pukyong National University) ;
  • JANG, Yong-Suk (Department of Fisheries Physics, Pukyong National University)
  • 최규석 (부경대학교 수산물리학과) ;
  • 이춘우 (부경대학교 해양생산시스템관리학부) ;
  • 이다윤 (부경대학교 수산물리학과) ;
  • 장용석 (부경대학교 수산물리학과)
  • Received : 2020.02.11
  • Accepted : 2020.05.18
  • Published : 2020.05.31
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Abstract

In fisheries, the importance of designing efficient fish cages is being emphasized as aquaculture has become more production than capture fishing. Particularly, the gravity cage system is one of the popular fish cage system in Korea. Currently, gravity cages of various shapes and sizes are being widely designed and installed in offshore and inland seas. The cage is subject to external forces, such as currents and waves, and the shape of the structure and tension on the ropes changes according to these external forces. Thus, it is important to accurately calculate these dynamic behavior, including the external forces and tension on the structure during the design stage. In this study, three types of cage systems with an equal internal volume of 8000 ㎥ were analyzed using mass-spring models and their behavior was interpreted through simulations. These simulations were used to analyze the behavior and tension of the ropes in response to currents and waves to aid in the selection of individual cage sizes for a given total volume. The numerical calculation results indicate that depending on the flow rate, the most resistant system is System 1, which has eight strays, and System 2 and System 3 have 69.4% and 54.8% of the resistance of System 1. Further, total resistance increased as the number of cages increased for all flow rates.

Keywords

References

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