This paper investigates wave loads of ships which suffer sinkage due to flood in a compartment caused by damage on side of hull. The motion of the damaged ship floating in waves is analyzed by using the boundary element method based on three dimensional potential theory considering hydrodynamic pressure in the flooded compartments. The shear forces, bending moments and torsional moments are calculated by the direct integration of the three dimensional hydrodynamic pressure on the outer and inner hulls. A RORO passenger ship with length of 174.8 m is considered in numerical example and results for wave loads are presented.
Since a damaged ship with flooded compartment suffer internal fluid flow due to flood in damaged compartment in addition to fluid flow by incident, scattering and radiating waves, wave loads of the ship may have very complex characteristics. Damaged ships are also vulnerable to capsize because they lack dynamic stability. Although dynamic stability is guaranteed, complex wave loads of damaged ships may induce damage propagation of hull which leads to capsize. Therefore, wave load analyses for various cases of damage are required in the design of ship hull.
For the numerical evaluation of wave loads, strip method is widely used. Nowadays, boundary element method based on three dimensional potential theory is also used. Hong et al. (1998) calculated wave loads of barges by three dimensional potential method and compared the results with those of strip method. Hong and Hong (2005) analyzed wave loads of barges with flooded internal blocks using three dimensional potential method and compared wave loads of intact barges and flooded barges.
In this study, researches by Hong and Hong (2005) are extended. This paper investigates wave loads of a ship with a flooded compartment caused by hull damage.
