ABSTRACT
The paper presents a method for the removal of irregular frequencies in seakeeping calculations when using 3D pulsating source panel codes. The method is based on an extension of the free-surface boundary condition to a hypothetical deck inside the ship hull. After a brief introduction to the problem of irregular frequencies and to methods for their removal, the potential theory wave-body interaction problem is formulated and solved by a modified 3D pulsating source method. The implementation of the developed method is demonstrated by use of NTUA’s in-house 3D panel code NEWDRIFT for the numerical analysis of the seakeeping of the DTC standard containership and comparisons with associated experiments.
