Abstract
Sloshing is associated with the structural safety of liquid storage vessel. Installing the baffles inside the containers would be beneficial for the mitigating the damage due to the severe sloshing. In this study, an innovative type of double-side curved baffle was proposed to evaluate its effect on reducing sloshing in a rectangular tank under surge and pitch excitation. For comparison with conventional baffles, effects of the vertical baffle and the T-type baffle on mitigating sloshing were also studied experimentally and numerically by analyzing the free surface wave elevation as well as the hydrodynamic pressure on the tank wall. The effective stress at the double-side curved baffle along the height direction of the baffle is much smaller than that at the T-type baffle although they have the same mitigation effect on sloshing wave heights. The sloshing-induced effective stress on the double-side curved baffles was analyzed by varying their radian. Findings show that the effective stress on the baffle tends to decrease with the increase in the radian. The velocity field was presented to observe effect of the baffles on sloshing with the aid of ADINA and laboratory experiments conducted on a hexapod motion platform.
Highlights
Liquid sloshing means severe motion of a free surface liquid inside a partially filled container, which is an unsteady and highly nonlinear phenomenon with frequency jump, shift in resonant frequency, super-harmonic resonance, responses at higher harmonics, and fractional harmonics of forcing frequency and difficult to describe in full detail [1]
Celebi and Akyildiz [4] used the volume of fluid (VOF) techniques to track the free surface of the fluid and studied the nonlinear sloshing phenomenon of the liquid in the partially filled rectangular tank
By tracking the true position of the free surface, the Arbitrary Lagrange Euler (ALE) method can realize the analysis of the fluid-structure coupling problem by the interaction between solid and liquid being transferred to each other through the coupling surface [32]. e basic equation is as follows: f where f is the convection velocity described by a certain physical quantity and ci is the convection velocity described by the Euler method. ci ui − wi, where ui is the material velocity of the fluid particle, wi is the velocity of the grid in the reference coordinate system, and x is the reference coordinate in the reference coordinate system
Summary
Liquid sloshing means severe motion of a free surface liquid inside a partially filled container, which is an unsteady and highly nonlinear phenomenon with frequency jump, shift in resonant frequency, super-harmonic resonance, responses at higher harmonics, and fractional harmonics of forcing frequency and difficult to describe in full detail [1]. Jin et al [20] studied experimentally effect of different horizontal porous baffles on liquid sloshing under different external excitation frequencies and amplitudes. Chu et al [23] investigated the characteristics of liquid sloshing with multiple vertical baffles installed on the bottom of the rectangular tank by varying the external excitation frequency, baffle number, and height. Unal et al [24] studied numerically the liquid sloshing in a closed and partially filled two-dimensional (2D) rectangular tank with T-type baffle under rotating excitation. Yu et al [25] experimentally studied effect of suppressing sloshing by using two perforated floating baffles under different solidity ratios, filling levels, and excitations.
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