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sharif university of technology
Abstract: (6 Views)
Accurate prediction of the hydrodynamic responses of floating offshore platforms is essential for their safe design and performance assessment under environmental loading conditions. In this study, the hydrodynamic behavior of a cell-truss spar platform was investigated using the MOSES software based on the Boundary Element Method (BEM). A three-dimensional numerical model of the platform was developed using approximately 1,800 boundary panels, and a mesh convergence study confirmed that increasing the mesh density resulted in variations of less than 2%, demonstrating the numerical stability of the model. Hydrodynamic analyses were carried out over a frequency range of 0–1.2 rad/s, and the added-mass coefficients together with the Response Amplitude Operators (RAOs) for surge, heave, and pitch motions were determined. The numerical results were validated against published data obtained using the Finite Element Method (FEM). The results demonstrate that the developed BEM model accurately predicts the hydrodynamic responses of the platform, with average relative errors of 5.63%, 6.10%, and 8.50% for the heave, surge, and pitch motions, respectively. In addition, the maximum dynamic responses in all three degrees of freedom occurred near a frequency of 0.34 rad/s, indicating resonance and showing good agreement with the reference results. The analysis of the added-mass coefficients further revealed that, in the resonance region, the ratios of added mass to the structural mass remained approximately 2.0 for surge and 0.5 for heave, with no abrupt variations, confirming the stable hydrodynamic behavior of the developed numerical model. Beyond model validation, this study presents, for the first time, the added-mass coefficients of a cell-truss spar platform, which were not reported in the reference study, thereby extending the available hydrodynamic database for this class of offshore structures. The findings demonstrate that the BEM-based model implemented in MOSES provides reliable accuracy for the hydrodynamic analysis and design of complex spar platforms and can serve as an effective tool for future studies on the dynamic analysis and structural design of offshore floating systems.
Keywords: Truss-Cell Spar Platform, Numerical Hydrodynamic Modeling, Dynamic Response Analysis, MOSES Software Simulation, Response Amplitude Operator
Type of Study: Research Paper |
Subject:
Offshore Hydrodynamic
Received: 2026/06/22 | Accepted: 2026/11/12
Received: 2026/06/22 | Accepted: 2026/11/12
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