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Hydrodynamic Response of Spar with Single and Double Heave Plates in Regular Waves
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 Title & Authors
Hydrodynamic Response of Spar with Single and Double Heave Plates in Regular Waves
Sudhakar, S.; Nallayarasu, S.;
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 Abstract
The motion response of floating structures should be adequately low to permit the operation of rigid risers along with dry well heads. Though Spar platforms have low heave responses under lower sea state, could become unacceptable in near resonance region of wave periods. Hence the hydrodynamic response, heave in particular, must be examined to ensure that it is minimized. To reduce heave motions, external damping devices are introduced and one such effective damping device is heave plate. Addition of heave plate can provide additional viscous damping and additional added mass in the heave direction which influence the heave motion. The present study focuses on the influence of heave plate on the hydrodynamic responses of Classic Spar in regular waves. The experimental investigation has been carried out on a 1:100 scale model of Spar with single and double heave plates in regular waves. Numerical investigation has been carried out to derive the hydrodynamic responses using ANSYS AQWA. The experimental results were compared with those obtained from numerical simulation and found to be in good agreement. The influence of disk diameter ratio, wave steepness, pretension in the mooring line and relative spacing between the plates on the hydrodynamic responses of Spar are evaluated and presented.
 Keywords
Spar;Single and double heave plate;Viscous damping;Added mass;Vortex shedding;Hydrodynamic response;motions;mooring line tension;
 Language
English
 Cited by
1.
Effect of Viscous Damping on Hydrodynamic Response of Spar with Heave Plate, Aquatic Procedia, 2015, 4, 508  crossref(new windwow)
2.
Heave motion response of a circular cylinder with the dual damping plates, Ocean Engineering, 2016, 125, 95  crossref(new windwow)
 References
1.
Fischer, F.J. and Gopalakrishnan, R, Some observations on the heave behaviour of Spar plat-forms, Journal of Offshore Mechanics and Arctic Engineering, 120 (1998) 221-225. crossref(new window)

2.
H. A. Haslum, UmoeOljeogGass/NTNU and O. M. Faltinsen, NTNU, Alternative Shape of Spar Platforms for Use in Hostile Areas, Offshore Technology Conference, OTC10953, Houston, Texas, U.S.A, May 3-6, (1999).

3.
Haslum Herbjorn Alf, Simplified Methods Ap-plied to Nonlinear Motion of Spar Platforms, Ph.D. Thesis, Norwegian University of Science and Technology, Trondheim, Norway (2000).

4.
Jun B.Rho., Hang S.Choi, Heave and Pitch motions of a Spar platform with Damping Plate, Proceedings of the twelfth International Off-shore and Polar Engineering Conference, Kita-kyushu, Japan, May 26-31, (2002).

5.
Sudhakar S. and Nallayarasu S, Influence of Heave plate on Hydrodynamic response of Spar, International Conference on Ocean, Off-shore and Artic Engineering, OMAE 49565, Rotterdam, Netherlands, June 19-24, (2011).

6.
Tao L. and Shunqing Cai, Heave motion sup-pression of a Spar with a heave plate, Journal of Ocean Engineering, 31 (2004), 669-692. crossref(new window)

7.
Tao, L., Molin, B., Scolan, Y.M. and Thiagara-jan, K, Spacing effects on hydrodynamics of heave plates on offshore structures, Journal of Fluids and Structures, 23 (2007), 1119-1136. crossref(new window)

8.
Nimmy T. P., Nallayaarasu S., and Bhattachar-ya S. K., Damping characteristics of Heave plates attached to Spar hull, International Conference on Ocean, Offshore and Arctic Engineering, OMAE 83290, Rio de Janeiro, Brazil, July 1-6, (2012).

9.
Thiagarajan, K.P., and Troesch, A.W. Effect of appendages and small currents on the hydro-dynamic heave damping of TLP columns, Journal of Offshore Mechanics and Arctic Engineering, 120 (1998), 37-42. crossref(new window)

10.
Yong-Pyo Hong, Dong-Yeon Lee, Yong-Ho Choi, Sam-Kwon Hong, and Se-Eun Kim, An experimental study on the Extreme hydro-dynamic responses of a Spar platform in the Heave Resonant Waves, Proceeding of Interna-tional Offshore and Polar Engineering Conference, Seoul, Korea, June 19-24, (2005).