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Experimental Investigation of Hydrodynamic Coefficients for Short-Crested Waves


  • Department of Civiland Environmental Engineering, University Technology PETRONAS, 32610 Seri Iskandar,PerakMalaysia, Malaysia
  • Department of Civiland Environmental Engineering, University Technology PETRONAS, 32610 Seri Iskandar,, Malaysia


Objectives: To determine the hydrodynamic coefficients; drag (Cd) and inertia (Cm), for short-crested waves exerted on vertical cylinder. Methods/Statistical Analysis: An experimental study on hydrodynamic coefficients of the top-fitted vertical cylinder subjected to short-crested waves is presented. The model tests were carried out in the wave tank of Offshore Laboratory of University Technology PETRONAS, Malaysia. In this study, the model testwas conducted by using two sets of vertical cylinder with diameter, 16 mm and 48 mm, which were subjected to four series of short-crested waves based on four different locations in Malaysian offshore region.The wave forces acting on the cylinder were recorded by using wave force sensor. The post processing data was carried outby considering The Least Square Method. The results were compared with the existing recommended hydrodynamic coefficients in the PETRONAS Technical Standard (PTS). Findings: The hydrodynamic coefficients for short-crested wave of a vertical cylinderwere obtained. The results showed that the experimental hydrodynamic coefficient values are 30 % to 45 % lowerthan the recommended hydrodynamic coefficients adopted by PTS. Application/Improvements: The hydrodynamic coefficients values obtained from this experimental investigationhave ensured the possibility of designing an economical and optimum design of offshore platforms could be achieved.


Drag Coefficient, Inertia Coefficient ,Short-Crested Wave

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  • Chakrabarti S K. Hydrodynamic of Offshore Structures.WIT Press. 1987;p.403.
  • Zhu SP. Diffraction of short-crested waves around a circular cylinder. Ocean Engineering. 1993; 20(4):39–407.
  • Sarpkaya T. Wave Forces on Offshore Structures. Cambridge University Press, New York. 2010.
  • Sarpkaya T. In - Line And Transverse Forces, Conference on Cylinders In Oscillatory Flow At High Reynolds Numbers, Offshore Tech. 1976;96–108.
  • Borgman LE. Computation of the ocean-wave forces on inclined cylinders. Transaction on American Geophysics.Union. 1958; 39(5): 885.
  • Chakrabarti SK, Wolbert AL, Tam WA. Wave forces on inclined tubes. Coast Engineering. 1977; 1:149–65.
  • Kurian VJ, Sebastian AA, Al-yacouby AM, Liew MS.Wave forces on linear arrays of rigid vertical circular cylinders in regular waves. Research Journal of Applied Sciences.
  • Engineering and Technology. 2014; 7(24):5249–57.
  • Kurian VJ, Sebastian AA, Al-yacouby AM, Liew MS.Effect of Sacrificial Anodes and Marine Growth on Hydrodynamic Coefficients of Rigid Cylinders. International Offshore and Polar Engineering Conference. 2015;488–95.
  • Kurian VJ, Al-yacouby AM., Sebastian AA, Liew MS.Hydrodynamic Coefficients for Array of Tubular Cylinders.International Ocean and Polar Engineering Conference.2014;641–8.
  • Chakrabarti SK. Offshore Structure Modelling. Advance series of ocean engineering. 2001; 9: 492.
  • PTS PETRONAS Technical Standards. 2008. Available from: file:///C:/Users/ISEE1/Downloads/PTS%2020002039%20 Advance%20Process%20Control%20Implementation%20 Guide%20 (1).pdf.
  • Morison JR, OBrien MP, Johnson JW, Schaaf SA. The forces exerted by surface wave on piles. Petrol Transaction on American Invitational Mathematics and petroleum Engineering.1950; 189:149–54.
  • Isaacson M, Subbiah K, Baldwin J. Force coefficient estimation from random wave data.International Offshore and Polar Engineering Conference, UK. 1991; 3;149–57.


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