Numerical Simulation of Damaged Ship Motion in Waves

摘要

The coupling motion of heave, pitch and roll of intact ship anddamaged ship in waves, and the flow of flood water in damaged tankhave been simulated based on viscous theory. The calculation model isa 29000 t tanker model moving at a constant speed with damaged tankin midship area. Three cosine waves including head waves, beamwaves and oblique waves are simulated by boundary input methodrespectively and the free surface is captured by Volume Of Fluid (VOF)method. The RANS equation is solved on full hexahedral unstructuredgrids using moving grids technique that is rigid deformation integratedwith weighted deformation. The calculation method is verified bysimulating the ship model test of DTMB5512 conducted by IIHR shiphydrodynamics group. It is shown that: (1) the nonlinear motions ofships in waves are affected by various factors, such as the influence ofencounter frequency and the coupling effect of the motions, and (2) theflow of flood water in damaged tank has a complex impact on shipmotion and to obtain the influence the effect factors should becomprehensively considered.