Experiments and CFD of a high-speed deep-V planing hull – part II: Slamming in waves

Part II of this two-part paper presents the results from experiments and simulations of a high-speed deep-V planing hull operating in head waves (both regular and irregular). Results from calm water comparisons were presented in Part I of this paper. The regular waves generated in the experiments showed more variability than desired, likely related to limitations of the wave maker capabilities. Both simulation and experimental pressure measurements showed re-entering and emerging peaks. The emerging slam is due to the hull emerging from the next wave peak and being pushed airborne again. The regular and irregular wave tests were used to see how well a single wave representation of the most probable wave (RWA) of an irregular wave field could provide motion, acceleration, and slamming pressure predictions for the irregular wave field. An extreme wave slam event correlation study using the CFD from irregular wave results is presented, showing the largest slams were correlated to consecutive waves that were short (small λ/L) and steep (small λ/H). The experimental mount and wave quality, especially for irregular waves, were factors for validation of resistance and slamming. Validation included motions, accelerations, and re-entering and emerging slamming pressures. Regular wave models for irregular waves and extreme event correlations were also investigated. Issues for future study were identified and included the experimental mount, the validation of resistance in waves, and reasons for the large experimental uncertainties and CFD errors for irregular waves.