Effect of Mesh Number on Accuracy of Semi Submersible Motion Prediction

Authors

  • Hassan Abyn Department of Aeronautic, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Adi Maimun Marin Technology Center, Universiti Technologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • M. Rafiqul Islam Bangladesh University of Engineering and Technology, Dhaka, Bangladesh
  • Allan Magee Technip Malaysia
  • Jaswar Jaswar Department of Aeronautic, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Behnam Bodaghi Department of Aeronautic, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Mohamad Pauzi Marin Technology Center, Universiti Technologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • C. L. Siow Department of Aeronautic, Automotive and Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia

DOI:

https://doi.org/10.11113/jt.v66.2486

Keywords:

Semi submersible, floating structures, 3D source density distribution technique, potential theory, mesh generation

Abstract

Generally, floating structures play an important role for exploring the oil and gas from the sea. The force and motion prediction of offshore structures may be carried out by using time domain or frequency domain or model tests. In this paper the frequency domain analysis used because it is the simplified and linearized form of the equations of motion. Mostly in numerical calculations the number of meshes plays an important role in the accuracy of results, time of calculation and facing to computer memory limitations. The 3D source distribution panel method is shown to be sensitive to mesh near the resonance frequencies of the floating body. So, it is important to establish best practices and determine the mesh requirements for a given level of accuracy. The results obtained from numerical commercial software HydroSTAR (Hstar) on semi submersible prove it.

References

Hess, J. L. and A. M. O. Smith, 1964. Calculation of Nonlifting Potential Flow About Arbitrary 3D Bodies. Journal of Ship Research. 1(1): 22–44.

Wu, S., J. J. Murray, and G. S. Virk, 1997. The Motions and Internal Forces of a Moored Semi-submersible in Regular Waves. Ocean Engineering. 24(7): 593–603.

Yilmaz, O. and A. Incecik, 1996. Extreme Motion Response Analysis of Moored Semi-submersibles. Ocean Engineering. 23(6): 497–517.

Söylemez, M., 1995. Motion Tests of a Twin-hulled Semi-submersible. Ocean Engineering. 22(6): 643–660.

Clauss, G. F., C. Schmittner, and K. Stutz. 2002. Time-domain Investigation of a Semi Submersible in Rogue Waves. in 21st International Conference on Offshore Mechanics and Arctic Engineering (OMAE2002). Oslo, Norway: ASME.

Newman, J. N. Progress in Wave Load Computations on Offshore Structures. In OMAE 2004. 2004. Vancouver.

Matos, V. L. F., A. N. Simos, and S. H. Sphaier, 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.

Wehausen, J. V. and E. V. Laitone. 2002. Surface Waves. Berlin: Springer.

Chen, X.-b. 2010. HydeoSTAR for exports - User Manual.

Downloads

Published

2014-01-01

Issue

Vol. 66 No. 2: Special Edition on Marine Technology

Section

Science and Engineering

License

Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.

How to Cite

Effect of Mesh Number on Accuracy of Semi Submersible Motion Prediction. (2014). Jurnal Teknologi (Sciences & Engineering), 66(2). https://doi.org/10.11113/jt.v66.2486