The sea-wave loads acting on the fixed offshore structures are estimated by using Airy's linear wave theory and Morison's equation, dissociating the total force into an inertia force component and a drag force component. The contribution of each component of the total force on tubular members can vary significantly based on size specification, from standard pipe members of fixed jacket structures to wide-ranging cylindrical Monopod towers. Inconclusive results can be seen in some published articles in estimating static wave loads using the hydrodynamic module of offshore platforms, indicating that this is still a subject of investigation. A demonstration of an example steel Monopod under Airy's type wave loading is presented. Several finite element offshore structure simulation packages use this simple monopod model for computationally efficient static wave load case simulations. The displacement pattern and the base shear force and bending moment of the Monopod model are calculated. The analytical solution is checked with numerical results of standard commercial FE software packages for verification and comparison purposes. The results show that the wave load calculation module of the finite element-based design programs considered in this study is underestimated, mainly when the contribution of the inertia coefficient to total instantaneous wave force is dominant, like in the monopod case with a large diameter. It can be thought that the differences here are due to the inertia coefficient weighting of the Morrison equation used in wave force calculations.
Offshore Structure Monopod Platform Morison Equation Linear Airy Sea-wave loads Hydrodynamic module Commercial offshore software
Primary Language | English |
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Subjects | Numerical Modelization in Civil Engineering |
Journal Section | Research Articles |
Authors | |
Early Pub Date | June 13, 2025 |
Publication Date | June 17, 2025 |
Submission Date | January 6, 2025 |
Acceptance Date | April 16, 2025 |
Published in Issue | Year 2025Volume: 9 Issue: 1 |
The works published in Journal of Innovative Science and Engineering (JISE) are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.