whole period of water entry including when separation from the knuckles occurs. Three-dimensional flow effects in the experiments are theoretically estimated. A simplified method to predict slamming load is also presented. This is based on a generalization of the Wagner(1932) approach. The exact body boundary condition is satisfied. No flow separation is accounted for. It is demonstrated that the simplified solution gives reasonable results. The commonly used method to calculate forces on bow flare sections based on von Karman method and conservation of momentum gives too low maximum force and a wrong time history of the force.
This work is carried out as a part of the DYNAMIC ANALYSIS SUPPORT SYSTEM PROJECT, DASS-Project. The project is a 5-years cooperative project between The Royal Norwegian Navy and The US Naval Sea System Command, Norwegian and US research institutes and universities, and the Norwegian industry.
Dobrovol'skaya, Z.N. ”On some problems of similarity flow of fluid with a free surface, ” J.Fluid Mech. Vol.36, pp.805–829, 1969
Faltinsen, O.M. ”Sea loads on ships and offshore structures,” Cambridge University Press, 1990.
Faltinsen, O.M. ”On seakeeping of conventional and high-speed vessels,” 15th Georg Weinblum Lecture, Journal of Ship Research, Vol.37, no.2, June 1993.
Faltinsen, O.M. ”The effect of hydroelasticity on ship slamming,” to be published in Phil. Trans. R. Soc. Lond., 1996.
Greenhow, M. and Lin, W.M. ”Nonlinear free surface effects: experiments and theory,” Department of Ocean Engineering, MIT, report no.83–19, 1983.
Greenhow, M. ”Wedge entry into initially calm water,” Appl. Ocean Res., Vol.9, pp.214–223, 1987.
Knapp, R., Daily, J,W., Hammitt, H.F.G. ”Cavitation,” McGraw-Hill Book Company, 1970.
Kvålsvold, J., Faltinsen, O.M., Aarsnes, J.V. ”Effect of structural elasticity on slamming against multihull vessels, ” In Proc. 6th. Int. Symp. on the Practical Design of Ships and Offshore Mobile Units(PRADS), pp.1684–1699, Seoul. 1995.
Meyerhoff, W.K., ”Added masses of thin rectangular plates calculated from potential theory,” Journal of Ship Research, pp.100–111, June 1970.
von Karman, T., ”The impact of seaplane floats during landing,” N.A.C.A. TN321, Washington, 1929.
Wagner, H., ”Über stoss- und Gleitvergänge an der Oberflache von Flüssigkeiten,” Zeitschr. f. Angew. Math. und Mech., Vol. 12, No. 4, pp.193–235, 1932.
Zhao, R., Faltinsen, O.M., ”Water entry of two-dimensional bodies,” J.Fluid Mech., Vol. 246, pp.593–612, 1993.