Taking KCS ship model as an example, using numerical tank technology and commercial CFD software, the free heave and trim motion of ship model sailing in infinite depth of still water is simulated in the time domain. Based on the coupled solution of ship motion equation and fluid flow equation, the VOF method is used to deal with the nonlinear free liquid surface, and the overlapping grid technique is used to deal with the grid. Finally, the relevant conditions of the ship model such as resistance, heave and trim are obtained, and the detailed information of the flow field including free surface wave, ship surface wave height and ship surface dynamic pressure are obtained at the same time, which is helpful to understand the mechanism of ship heave and trim motion. The calculated results are compared with the relevant experimental data, and the agreement with the experimental data is good.
CFD numerical simulation plays an important role in the design and research of marine fire water cannon. In order to improve the accuracy and reliability of numerical hydrodynamic simulation on the inner flow field of fire water cannon, the present article presented a method based on Richardson extrapolation method to estimate the grid error. And then the low-error computational grids are employed to simulate the inner flow field of the marine fire water cannon with different contraction angles. The change rules of spraying velocity of marine fire water cannon with contraction angles under different inlet pressure are obtained.
The results show that optimizing the contraction angle of fire water cannon has a certain effect on reducing turbulence and increasing the velocity of outlet. This study might provide a grid error analysis method for the optimization design of marine fire water cannon by using numerical method in the future.
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