Numerical Procedures and Practical Experience of Assessment of Parametric Roll of Container Carriers Abstract

The paper examines several aspects related to practical assessment of parametric roll of container carriers. The numerical procedure is based on application of the Large Amplitude Motion Program (LAMP), the nonlinear potential flow code. Viscous roll damping is included from the roll decay test. The rational choice of the loading conditions is considered. Practical non-ergodicity of the response is taken into account. The paper also examines the way to make the development of the polar diagram more efficient. Using an envelope presentation for the irregular wave may yield a way to work with parametric roll in probability rather than in time domain. A single wave group should then be considered as an elementary random event