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Group of Marine Dynamics and Hydrodynamics > 2.2 Nonlinear Motions and Loads > Publications
Vijith, P.P., Rajendran, S., Wang, S. and Guedes Soares, C. (2025), Numerical assessment of wave-induced motions and rigid bending and torsional loads acting on large slender ships in various operating conditions using a 2D time domain method, Ocean Engineering, Vol. 335, 121524.
The motions and rigid body loads experienced by large containerships in various operating conditions are studied using a 2-dimensional seakeeping code in the time domain. The TD solver is developed based on strip theory, and the hydrodynamic parameters are evaluated using the one-dimensional panel (line panels) method. The equations of the ship’s motions are framed in the body coordinate system. The proposed solver computes the motions and wave-induced rigid loads at any section on the ship hull, i.e., vertical bending (WVBM), horizontal bending (WHBM), and torsion (WTM) in high-amplitude regular and irregular wave conditions. The investigations are conducted on two containership prototypes in different heading and transit speed conditions. Due to the large open cross-section, containerships are highly prone to torsion in oblique seas. The proposed formulation assesses bending and torsional loads under severe sea conditions. The motions in small amplitude waves are compared with the 3D Frequency domain solver (NEMOH) for zero speed. The sectional loads induced on the hull under different wave cases and different operating vessel speeds are compared with the experimental results. The effects of nonlinearity in hydrodynamic forces due to the hull geometry and vessel speed on rigid body loads are investigated and presented. The comparative studies on statistical values of rigid body loads in irregular sea conditions are also presented. The analysis concludes with the efficiency and limitations of the solver in detail.
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