Structural Response and Mooring Dynamics of a Vessel-Shaped Fish Cage Considering Hydroelastic Effects

Engineering ›› DOI: 10.1016/j.eng.2025.10.005

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Abstract

A vessel-shaped fish cage (length: ∼400 m) is a representative structure in large-scale offshore aquaculture. Its hydroelastic response under environmental loads is a crucial issue. Accordingly, in this study, a comprehensive coupled hydroelastic analysis was developed based on the beam-connected discrete module method and considering interactions between the floating body, steel frames, net twines, and mooring lines. The floating body was discretized into multiple modules connected to a stiffness-equivalent elastic beam, with their hydrodynamic coefficients and potential loads calculated in the frequency domain. Slender structural components, including net twines and steel frames, were modeled as Morison elements. Their loads were applied to the equivalent beam through master–slave constraints, with iterative numerical simulations incorporating the influence of diffraction and radiation wave fields from the floating body on the net’s loading conditions. The results reveal that hydroelastic responses are primarily governed by first-order wave loads, significantly influencing the vertical motion and cross-sectional load effects. Drag damping plays a crucial role in suppressing system resonance, particularly in mooring responses, with its neglect leading to overly conservative results. Our analysis demonstrates that while hydroelastic effects are significant under short-period wave conditions, they are less pronounced under long-period waves. The findings of this study provide valuable insights for the design and optimization of large-scale vessel-shaped fish cages, contributing to the advancement of offshore aquaculture technology.

Keywords

Vessel-shaped fish cage / Structural response / Mooring system / Hydroelasticity / Drag damping

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Yunqiang Peng, Tianhu Cheng, Shixiao Fu, Yuwang Xu, Torgeir Moan, Huajun Li, Zhentao Jiang, John M. Niedzwecki, Yihou Wang. Structural Response and Mooring Dynamics of a Vessel-Shaped Fish Cage Considering Hydroelastic Effects. Engineering DOI:10.1016/j.eng.2025.10.005

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