Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction
Abstract
This paper discusses the numerical prediction of the semi-submersible’s heave motion. In the previous study, it is observed that the heave motion response predicted by diffraction potential theory is over-estimated in the region where the heave motion is dominated by damping. In this research, viscous damping is included in the calculation to increase the heave damping magnitude in motion equation. The wave force and added mass of semi-submersible is predicted by diffraction potential theory, only the total damping is corrected by sum-up the linear damping from diffraction potential theory with the proposed viscous damping. The heave motion response obtained from the proposed numerical method also compared to the data from the experiment. From the comparison, it can conclude that involved of viscous damping in the calculation will corrected a part of heave motion response tendency and reduce the large over-predicted error of heave motion response at the damping dominate.
##Keywords:##
Diffraction Potential, Viscous Damping, Heave Motion, Semi-Submersible.
Published
Mar 20, 2014
How to Cite
SOW, C.L; KOTO, Jaswar; ABYN, Hassan.
Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction.
Journal of Ocean, Mechanical and Aerospace -science and engineering-, [S.l.], v. 5, n. 1, p. 23-29, mar. 2014.
ISSN 2527-6085.
Available at: <https://isomase.org/Journals/index.php/jomase/article/view/512>. Date accessed: 09 may 2026.
doi: http://dx.doi.org/10.36842/jomase.v5i1.512.
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2. Van Oortmerssen, G., (1979).Hydrodynamic interaction between two structures of floating in waves, Proc. of BOSS ‘79. Second International Conference on Behavior of Offshore Structures, London.
3. Loken, E.,(1981). Hydrodynamic interaction between several floating bodies of arbitrary form in Waves, Proc. of International Symposium on Hydrodynamics in Ocean Engineering, NIT, Trondheim.
4. Wu, S.,Murray, J. J.,Virk, G. S.,(1997). The motions and internal forces of a moored semi-submersible in regular waves, Ocean Engineering, 24(7), 593-603.
5. Yilmaz, A. Incecik,(1996). Extreme motion response analysis of moored semi-submersibles, Ocean Engineering, 23(6) 497-517.
6. Söylemez, M.,(1995). Motion tests of a twin-hulled semi-submersible, Ocean Engineering, 22(6) 643-660.
7. Clauss, G. F.,Schmittner, C.,Stutz, K., (2002). Time-Domain Investigation of a Semi Submersible in Rogue Waves, Proc. of the 21st International Conference on Offshore Mechanics and Arctic Engineering), Oslo, Norway.
8. Matos, V. L. F.,Simos, A. N.,Sphaier, S. H., (2011). Second-order resonant heave, roll and pitch motions of a deep-draft semi-submersible: Theoretical and Experimental Results, Ocean Engineering, 38(17–18) 2227-2243. 9. Wackers, J. et al., (2011). Free-Surface Viscous Flow Solution Methods for Ship Hydrodynamics, Archive of Computational Methods in Engineering, Vol. 18 1–41.
10. Afrizal, E., Mufti, F.M., Siow, C.L., Jaswar, (2013). Study of Fluid Flow Characteristic around Rounded-Shape FPSO Using RANS Method, The 8th International Conference on Numerical Analysis in Engineering, pp: 46 – 56, Pekanbaru, Indonesia.
11. Jaswar et al, (2011). An integrated CFD simulation tool in naval architecture and offshore (NAO) engineering, The 4thInternational Meeting of Advances in Thermofluids, Melaka, Malaysia, AIP Conf. Proc. 1440, pp: 1175 - 1181.
12. Abyn, H., Maimun, A., Jaswar, Islam, M. R., Magee, Bodagi, A., B.,Pauzi, M., (2012). Model Test of Hydrodynamic Interactions of Floating Structures in Regular Waves, Proc. of the 6th Asia-Pacific Workshop on Marine Hydrodynamics, pp: 73 - 78, Malaysia.
13. Abyn, H.,Maimun, A., Jaswar, Islam, M. R., Magee, A.,Bodagi, B., Pauzi, M., (2012). Effect of Mesh Number on Accuracy of Semi-Submersible Motion Prediction, Proc. of the 6th Asia-Pacific Workshop on Marine Hydrodynamics, pp: 582 - 587, Malaysia.
14. Siow, C. L., Jaswar, Afrizal, E., Abyn, H., Maimun, A., Pauzi, M., (2013). Comparative of Hydrodynamic Effect between Double Bodies to Single Body in Tank, The 8th International Conference on Numerical Analysis in Engineering, pp: 64 – 73, Pekanbaru, Indonesia.
15. Tiau, K.U., Jaswar, Hassan Abyn and Siow, C.L., (2012). Study On Mobile Floating Harbor Concept, Proc. of the 6thAsia-Pacific Workshop on Marine Hydrodynamics, pp: 224 - 228, Malaysia.
16. Kvittem, M. I.,Bachynski, E.E.,Moan, T., (2012). Effect of Hydrodynamic Modeling in Fully Coupled Simulations of a Semi-Submersible Wind Turbine, Energy Procedia, 24.
17. Siow, C. L., Abby Hassan, and Jaswar, (2013). Semi-Submersible’s Response Prediction by Diffraction Potential Method, The International Conference on Marine Safety and Environment, pp: 21 - 28, Johor, Malaysia.
18. Lu, L., et al. (2011). Modelling of multi-bodies in close proximity under water waves—Fluid forces on floating bodies. Ocean Engineering. 38(13): p. 1403-1416.
19. Nallayarasu,S. and Siva Prasad, P., (2012). Hydrodynamic Response of Spar and Semi-submersible Interlinked by a Rigid Yoke - Part 1: Regular Wave, Ship and Offshore Structures, 7(3).
20. Christina Sjöbris, (2012). Decommissioning of SPM buoy, Master of Science Thesis, Chalmers University of Technology, Gothenburg, Sweden.
21. Journee, J.M.J and Massie, W.W. (2001). Offshore Hydromechanics. (1st Edition.), Delf University of Technology.
