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Ocean Systems Engineering
  Volume 5, Number 2, June 2015, pages 109-123

Numerical simulation of the coupled dynamic response of a submerged floating tunnel with mooring lines in regular waves
Cristian Cifuentes, Seungjun Kim, M.H. Kim and W.S. Park

    In the present study, the coupled dynamic response of a Submerged Floating Tunnel (SFT) and mooring lines under regular waves is solved by using two independent numerical simulation methods, OrcaFlex and CHARM3D, in time domain. Variations of Buoyancy to Weight Ratio (BWR), wave steepness/period, and water/submergence depth are considered as design and environmental parameters in the study. Two different mooring-line configurations, vertical and inclined, are studied to find an optimum design in terms of limiting tunnel motions and minimizing mooring-line tension. The numerical results are successfully validated by direct comparison against published experimental data. The results show that tunnel motions and tether tensions grow with wave height and period and decrease with submergence depth. The inclined mooring system is more effective in restricting tunnel motions compared to the vertical mooring system. Overall, the present study demonstrates the feasibility of this type of structure as an alternative to traditional bridges or under-seabed tunnels.
Key Words
    SFT (Submerged Floating Tunnel); tethers; coupled dynamics; FEM/BEM (Finite/Boundary Element Method); drag coefficient; BWR (Buoyancy to Weight Ratio); vertical/inclined mooring; line tensions
Cristian Cifuentes, Seungjun Kim and M.H. Kim: Ocean Engineering Program, Department of Civil Engineering, Texas A&M University College Station, Texas, USA
W.S. Park: KIOST, Korea

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