Two-dimensional numerical models of liquid sloshing in a partially filled rectangular tank using two CFD programs ADINA and COMSOL, which both base on the finite-element method and the arbitrary-Lagrangian-Eulerian method, are developed and validated against each other and available analytical solution and experimental data. Natural frequencies of the liquid tank with water are computed using ADINA and compared with analytical solutions. Parametric sensitivity studies are carried out by a series of numerical experiments, which are conducted to investigate the effects of excitation frequencies and filling levels on the liquid sloshing under surge and pitch excitation.

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