Calculation of Horizontal Sectional Loads and Torsional Moment

Abstract

C alculation of H orizontal S ectional Loads and Torsional M o m en tHorizontal sectional loads (horizontal shear force and horizontal bending moment) and torsional moment are more difficult to predict with potential flow methods than vertical loads, especially in stern-quartering waves. Accurate computation of torsional moment is especially important for large modern container ships. The three-dimensional (3D) sea keeping code GL Rankine has been applied previously to the computation of vertical loads in head, following and oblique waves; this paper addresses horizontal loads and tor sional moment in oblique waves at various forward speeds for a modern container ship. The results obtained with the Rankine source-patch method are compared with the compu tations using zero-speed free-surface Green functions and with model experiments.