Hydrodynamics of offshore structures under waves and current: fundamental theory, formulation of the problem and a case study

• Autorzy: Mendes A. C.
• Konferencja: Symposium “Vibrations In Physical Systems” (20 ; 21-25.05.2002 ; Poznań-Błażejewko, Polska)
• Języki publikacji: EN

Abstrakty

EN

This lecture is devoted firstly to a statement of the physical properties of gravity waves that is followed by a review on Linear Theory of waves of small amplitude, together with the related basic equations. This material includes the calculation of water pressure and water-particle kinematics, and the establishment of mass, momentum and energy balances. On a second stage it will be given a comprehensive material concerning the methodologies applied to calculate the wave forces. In the present case we will be involved with the Morison model and the corresponding hydrodynamic coefficients, when predicting the wave forces exerted upon tubular structures. Finally, a case study will be presented, relating both theoretical and experimental results obtained with a physical model of an offshore jacket platform.

Słowa kluczowe

EN

offshore structures; gravity waves; wave forces

PL

konstrukcje offshore; fala grawitacyjna; siła fali

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2002
• Tom: Vol. 20
• Strony: 34--57
• Opis fizyczny: Bibliogr. 18 poz., 1 fot., rys., wykr.

Twórcy

autor

Mendes A. C.

• Laboratory of Fluid Mechanics and Hydrodynamics, Department of Electromechanical Engineering, Universidade da Beira Interior, R. Marques D’Ävila e Bolama, 6201-001 Covilhä, Portugal

Bibliografia

• [1] Bearman, P.W., Graham, J.M.R.: Hydrodynamic forces on cylindrical bodies in oscillatory flow. Proc. 2nd Int. Conf. on Behavior of Offshore Structures, pp.309-322, London (1979).
• [2] Chakrabarti, S.: Impact of analytical, model and field studies on the design of offshore structures. Proc. of the Int. Symp. on OESH, Gothenburg (1980).
• [3] Chakrabarti, S.K.: Inline forces on fixed vertical cylinder in waves. J. Waterway, Port, Coastal and Ocean Division, ASCE, 106, pp. 145-155, 1980.
• [4] Chakrabarti, S.K.: Offshore Structure Modeling. Ed. World Scientific, New Jersey (1994).
• [5] Chakrabarti, S.K.: Hydrodynamics of Offshore Structures. Ed. WIT Press, Southampton (1999).
• [6] Chaplin, J.R.: Loading on a horizontal cylinder in irregular waves at large scale. Int. J. Offshore and Polar Engng., 1(4), pp.247-254, 1991.
• [7] Chaplin, J.R.: Hydrodynamic damping of cylinders in still water, in currents and in oscillatory flow. Proc. of the Int. Workshop on Environmental Loading on Offshore Structures, pp.6-15, Universidade da Beira Interior, Covilhä (1997).
• [8] Chaplin, J.R.: Hydrodynamic damping of a cylinder at ß=106. Proc. of the TMR/ALF End-of-Programme Workshop, Delft (1999).
• [9] Dean, R.G., Dalrymple, R.A.: Water Wave Mechanics for Engineers and Scientists. Ed. World Scientific, New Jersey (1991).
• [10] Efthymiou, M., Graham, C.G.: Environmental loading on fixed offshore platforms; in Environmental Forces on Offshore Platforms and Their Prediction, Vol. 26, pp.293- 320. Ed. Kluwer Academic Publishers, London (1990).
• [11] Faltinsen, O.M.: Sea Loads on Ships and Offshore Structures. Ed. Cambridge University Press, New York (1990).
• [12] Garrison, C.S., Field, J.B., May, M.D.: Drag and inertia forces on a cylinder in a periodic flow. J. Waterway, Port, Coastal and Ocean Division, ASCE, 103, (WW2), pp. 193-204, 1977.
• [13] Iwagaki, Y., Asano, T., Nagai, F.: Hydrodynamic forces on a circular cylinder placed in wave-current co-existing fields. Memoirs of the Faculty of Engineering, XLV (1), pp.l 1-23, Kyoto University (1983).
• [14] Keulegan, G.H., Carpenter, L.H.: Forces on cylinders and plates in an oscillating fluid. J. of Research of The National Bureau of Standards, 60, 5, pp.423-440, 1958.
• [15] Mendes, A.C., Kishev, R., Chaplin, J.R., Tomchev, S.: Experimental determination of the hydrodynamic loading on a model of offshore platform in waves and current. Proc. 10th International Offshore and Polar Engineering Conference/ISOPE, Vol. I, pp. 196-203, Seattle (2000).
• [16] Morison, J.R., O’Brien, M.P., Johnson, J.W., Schaaf, S.A.: The force exerted by surface waves on piles. Petroleum Transactions, AIME , 189, pp. 149-157, 1950.
• [17] Sarpkaya, T., Collins, N.J., Evans, S.R.: Wave forces on rough-walled cylinders at high Reynolds Numbers. Proc. 9th Offshore Technology Conference, pp. 175-184, Houston (1977).
• [18] Vugts, J.A.: Review of hydrodynamic loads on offshore structures and their formulation. Proc., of the Int. Conf. on the Behaviour of Offshore Structures, London (1979).