Study on the inflow velocity of ships based on fuzzy theory

Abstract

In order to study the relationship between the information of the inlet and the inlet velocity, the inlet velocity was evaluated based on a variety of factors. The computational fluid dynamics simulation process, the water VOF technique to realize visualization, access to the water inlet velocity and analysis into the water velocity changes with time, the analysis break area, height, shape, the influence of longitudinal position of inlet velocity, inlet velocity model for the evaluation of structure based on fuzzy theory, quantitative breach the influence degree of the shape, location of feed speed, choose different fuzzy operator feed speed calculation. The results show that:for the damaged inlet water of this model, the inlet water velocity shows a trend of increasing, decreasing, slightly increasing and basically stabilizing. The inlet water velocity increases linearly with the area of the breach, while the height and longitudinal position of the breach have no effect on the inlet water velocity. The larger the proportion of the vertical length of the breach, the larger the inlet water velocity. After considering the different fracture positions and shapes, the comprehensive inlet velocity can be evaluated based on the fuzzy theory. The comprehensive inlet velocity after considering the main factors is 2.08 m/s, and the comprehensive inlet velocity after considering all the influencing factors is 1.88 m/s.