Study Of The Slamming Load Caracteristics Under Direct Wave Impact On The Wet-Deck Of SWATH

During ocean voyages,ships will encounter severe sea conditions and slamming.Due to the special structure of the small waterplane area twin hull ship(SWATH),the wet-deck may be damaged by slamming.At present,the research on the physical mechanism of SWATH slamming is insufficient.Therefore,this article focuses on the study of the wave surface motion mode and the characteristics of the slamming load under the wet-deck during the slamming process of the SWATH restrained model.In order to verify the effectiveness and accuracy of the numerical simulation method,the numerical simulation method of water entry of the structure in clam water was first studied.The slamming process of wedge and bow flare entering the water were simulated respectively.The accuracy of the numerical simulation method was verified by comparison,and the influence of the three-dimensional effect was studied.Secondly,the slamming load test of the SWATH restrained model in regular wave was carried out.Test points and test conditions were designed.The variation rules of the slamming pressure peak value of different sections under the same test condition was summarized.And the variation law of the average value of slamming pressure between different wave height and different wave length was analyzed.Thirdly,the numerical simulation method of the slamming of the SWATH constrained model in regular wave was studied.The numerical wave-making method was first studied.Then,the convergence analysis of the slamming pressure simulation results of the SWATH restrained model was carried out.The slamming load variation rules and wave surface flow mode of different sections during the SWATH restrained model slamming in regular wave were preliminarily analyzed.The simulation results were used to guide the selection of slamming pressure measuring points in the model test.Finally,the slamming pressure results of numerical simulation and model test were compared.The accuracy of the numerical simulation results was verified.According to the numerical simulation results,the lateral and longitudinal motion modes of the wave surface under the wet-deck were analyzed separately.The variation of wave surface motion mode under the wet-deck in different test conditions during slamming was summarized.The lateral and longitudinal pressure distribution of the wet deck were analyzed,and the variation of the pressure distribution and the dangerous part when the slamming occurs were obtained.Finally,the variation of wave surface and flow field were analyzed simultaneously.