Hydrodynamic moments due to water on ship deck

  • Witold Błocki Technical University of Gdańsk


An analysis of the ship stability requires computer simulations of the ship motions leading to its capsizing. The large amplitudes of roll motion of the ship are connected with phenomena of immersing of ship deck into water. These phenomena require to take into account additional moments connected with water on a deck. The paper presents a new method (1994) of calculating these additional moments. An approximate and simple calculation of the additional moments is based on the second principle of dynamics applied to an element of a water running off the deck. The additional moments applied in numerical simulations of the ship motions, change significantly the roll motion. The paper presents results obtained from computer simulations. Some of the results are compared with the results of an experiment done with the ship model.



[1] K. Amagai, N. Kimura, K. Ueno. On the Practical Evaluation of Shallow Water Effect in Large Inclinations for Small Fishing Boats. Fifth International Conference on Stability of Ships and Ocean Vehicles, vol. 3, Melbourne, USA, 7-11 Nov. 1994.
[2] V. Armenio, M. La Rocca. On the Analysis of Sloshing of Water in Rectangular Containers: Numerical Study and Experimental Validation. Ocean Engineering, 23(8): 705-739, 1996.
[3] V. Armenio, A. Francescutto, M. La Rocca. On the Hydrodynamic Coupling between the Ship Roll Motion and Liquid Sloshing in a Flooded Tank. International Symposium Ship Safety in a Seaway: Stability, Manoeuvrability, Nonlinear Approach, vol. 2, Kaliningrad, 15- 19 May, 1995.
[4] W. Błocki. Ship Safety in Connection with Parametric Resonance of the Roll. Intentional Shipbuilding Progress, 21(306): 36- 53, 1980.
[5] W. Błocki. Probability of Non-Capsizing of a Ship as a Measure of her Safety. Third International Conference on Stability of Ships and Ocean Vehicles, vol. 2, 143-149, Gdańsk, 22-26 Sept. 1986.
May 31, 2023
How to Cite
BŁOCKI, Witold. Hydrodynamic moments due to water on ship deck. Computer Assisted Methods in Engineering and Science, [S.l.], v. 5, n. 2, p. 129-137, may 2023. ISSN 2956-5839. Available at: <https://cames.ippt.pan.pl/index.php/cames/article/view/1349>. Date accessed: 18 july 2024.