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ISSN Печать: 2169-2785
ISSN Онлайн: 2167-857X
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FREE LIQUID SURFACE SLOSHING IN A TANK OF A MOVING VEHICLE AND ITS SUPPRESSION
Краткое описание
Liquid sloshing in a tank is a frequently encountered anomalous fluctuation phenomenon of free liquid surfaces. Therefore, it is of great practical significance for the automobile industry to study liquid sloshing dynamics. In this paper, a numerical technique based on the volume of fluid (VOF) method is proposed to solve a classical liquid sloshing model for the free liquid interface in a tank. In the simulation process, the fluent k−ε turbulence model is used and the acceleration source term is compiled by user-defined functions. The two most important parameters are the surface tension coefficient and the kinematic viscosity of the liquid, which correspond to 0.0206 N/m and 7.6 × 10-5 m2/s, respectively. Compared to the potential flow theory with three liquid level cases, employing the VOF method can obtain the free-surface fluctuation behaviors during sloshing on a variety of more complicated boundary conditions. The numerical results show that they are in good agreement with the theoretical solution based on the potential flow theory when fuel is not able to contact the upper wall or infiltrates the left or right walls simultaneously. In order to damp large-amplitude liquid sloshing, lateral baffles with different arrays were installed in the tank. It was found that the installed baffles can effectively suppress sloshing. Subsequently, the structural length and installation position of the lateral baffle, as well as the length of the vertical baffle were optimized. It is shown that the lateral baffle length should be set as 0.15 m and installed at the same height as the free surface, which will result in a good suppression effect. When installed in the middle of the bottom wall to damp the sloshing, a vertical baffle with a length from 0.14 to 0.15 m has a much better effect.
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