Numerical Study On The Low Speed Oblique Water-exit Process Of The Trans-media Vehicle

The issue of water-exit from trans-media vehicle is gradually being widely concerned by the shipbuilding and weapon industries,so many countries have invested a lot of manpower and material resources in research.This article studies the oblique water-exit process of the trans-media vehicle,which is a complex process involving solid,liquid,and gas three-phase coupling and has a strong nonlinear relationship.Studying this characteristic process can provide certain assistance for future information investigation and target strike.This article uses numerical simulation methods to study the process of oblique water-exit of a trans-media vehicle.The main research content is as follows:Based on the fluid software STAR-CCM+,realize the six degrees of freedom body motion technology and build nested grids;Compare the experimental results with the numerical simulation results to verify the correctness of the numerical calculation method used in the entire article.Verify and calculate parameters such as different grid quantities and different computational domain sizes,and ultimately determine the calculation parameters.In order to study the influence of the structure of the vehicle on the oblique water-exit process,the oblique water-exit process of the vehicle at different centroid positions was analyzed and studied,describing the changes in bubble morphology,surface wetting area,and related motion characteristics parameters.Within the calculation scope of this article,the centroid with relatively stable navigation is selected.And based on this centroid,the oblique water-exit process of different quality vehicle was studied,and the impact of different quality vehicle on the oblique water-exit process was ultimately obtained.In order to study the effects of different navigation conditions and wave conditions on the oblique water-exit process,multiple influencing factors such as: initial navigation speed,initial navigation angle,angle of attack,cross flow velocity,water-exit phase position,wave height,wave length,etc.were studied.The changes in liquid phase volume fraction and surface wetting area at different typical moments were described,and the complete water-exit process velocity,angular velocity,and deflection angle of the vehicle were obtained.Graph the changes in centroid displacement and other curves,and finally obtain the attitude and centroid displacement changes of the oblique water-exit process under different influencing factors.Provide reference for the research on the process of the water-exit of the vehicle in the later stage.