Numerical prediction of slamming loads on hull profile structures with varying curvatures during water entry

During water entry, hull profiles of varying geometries induce pronounced air-cushion effects and slamming load oscillations, which may lead to structural failure or fatigue damage. This paper employed a self-developed CPU/GPU heterogeneous parallel numerical platform based on the Radial Basis Function Ghost Cell Method (RBFGCM) to investigate the slamming characteristics of symmetric and asymmetric curved wedges with different curvatures. The analysis concentrates on load variations, air cushion dynamics, and free-surface evolution. The results reveal that symmetric wedges with smaller curvature demonstrate smoother velocity decay, lower hydrodynamic resistance, and prolonged pressure oscillations with a uniform distribution. Conversely, larger radius of curvature wedges exhibited 133.3% higher instantaneous pressure peaks and accelerated velocity dissipation, accompanied by intensified free surface disturbances and premature jet separation. Increasing the deadrise angle from 25° to 35° reduces the peak slamming pressure by 39%. For asymmetric impacts, larger radius of curvature decreased the lateral load amplitude by 58% with mitigated oscillations. The C1 configuration displays distinctive positive-negative phase transitions at a 15° inclination, whereas the C5 profile maintains 32% lower lateral load fluctuations. The vertical force coefficient analysis reveals localized high-pressure zones for specific inclination-deadrise pairs: 25° deadrise at 25° inclination and 35° deadrise at 30° inclination. These findings provide critical insights for optimizing hull geometry in high-speed vessel design, enabling balanced load mitigation and hydrodynamic stability through strategic curvature parameter selection.