Roll damping assessment of intact and damaged ship by CFD and EFD methods

This paper presents an assessment of the roll damping of DTMB 5415 naval ship model in both intact and two compartments symmetric damaged scenarios. An experimental assessment of roll decay is performed at zero speed at different initial heel angles at the University of Strathclyde, Glasgow. Reported experimental results are decay curves, natural frequency and period of roll for intact and damaged ship. CFD calculations are performed by CDAdapco StarCCM+ software investigating the accuracy and efficiency of the numerical approach. In the numerical procedure the sensitivity analysis on mesh refinement for damaged ship was performed. Furthermore, a sensitivity analysis on time step and turbulence models was performed for the intact ship. Numerical results are plotted against experimental to verify the precision of the numerical simulations. Obtained numerical results are shown to be reasonably accurate although the calculation time still precludes the use of CFD analysis as a standard design procedure.