| Currently, in order to improve design standards of contained liquid vessels and maritime navigation safety, it's urgent to establish the full mathematical model and theoretical analysis considering three mutual coupling of the hull movement, the liquid sloshing and dynamic deformation of the tank structure, so it's able to predict ship motion and loads effectively. This paper mainly discusses the mutual coupling analysis method about tank sloshing and structural deformation, and reveals the mechanism of mutual coupling, in order to further study the mutual coupling of the liquid sloshing, dynamic deformation of the tank structure and the hull movement. The processes are as the following:First of all, it's established about the mathematical model of tank sloshing, and on the base of it, the numerical model is discussed simply and verified by comparing to the experiment data, then further analysis results are presented. So the correlative numerical calculations include the two-dimensional, three-dimensional as well as the LNG tank sloshing vessels.Secondly, it's established to the structural dynamic equations of motion on the base of a two-dimensional simple elastic structure, selecting the Newmark-βmethod as a numerical method for solving the structure equations of motion, and also translating it to a C language program.Finally, the method combining CFD software and the C language programs is used for solving the mutual coupling of structural and fluid under the sloshing problem. The calculation is first to verify the correctness of the C language programs by Comparing to the result of Ansys software, and then apply it to the sloshing fluid and flexible anti-sloshing structure in the coupling solution.This article is mainly obtained the following conclusions:1,For the rigid tankFirst, by comparing with the experimental data,confirmed that the numerical model used in this article is correct;Second, through a large number of calculations for different conditions and analyzing the results, summarized the reasons in the calculation of using the Fluent for the existence of some errors as follows: (1) the existence of discrete numerical errors, such as rounding error, truncation error, etc.; (2) use a method of "patch method" to monitor the wall pressure, so the accuracy of pressure values is relative with the division of cell surface or body; (3) For large-amplitude sloshing, the tank wall suffered from the impact load is more frequent, and therefore the simulation need the Net Grid quality higher;Third, according to the accumulated experience, generally we can select the grid spacing of 0.01 meters and the time step of 0.01 seconds, if the calculations do not converge, it can be properly reduced, but not less than 0.001s;Fourth, the sloshing tank problems in the real ship are more complex and need more in-depth studies.2,The simulation of considering structural deformationFirst of all, with Ansys software, the program is verified and the results show that it is feasible;Secondly, the study method which adopting sloshing fluid and flexible anti-sloshing structure has certain significance;Thirdly, since the small size of the flexible anti-sloshing structure, the flow field don't change very clearly, we need for further follow-up studies;... |
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