Browsing by Author "Shri, S."

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Experimental Study on Liquid Sloshing Dynamics in a Sway Excited Rectangular Tank
(Springer Science and Business Media Deutschland GmbH, 2024) Sahaj, K.V.; Shri, S.; Nasar, T.
An experimental shake table program is performed to explore the hydrodynamic behavior of liquid sloshing phenomena in a partially filled rectangular tank of 1:43 scaled tank subjected to sway excitation. Three different aspect ratios (hs/l, liquid depth, hs to the length of the tank, l) of 0.163, 0.325 and 0.488 which corresponds to 25%, 50% and 75% fill depths are considered. Excitation parameters such as frequencies ranging from 0.45 to 3.2Â Hz which encompasses up to fifth mode of sloshing frequency and amplitudes of 4 and 8Â mm are considered. An experimental setup is designed and devised to measure the sloshing force by using ballast mass concept. The experimental parameters such as run-up of sloshing oscillation, sloshing force and spectral energy are discussed. Experimental results of sloshing oscillation are compared with the numerical works of Nasar et al. (J Nav Archit Mar Eng 9:43â€“65, 2012). The present study reveals that the effect of excitation on sloshing oscillation is more pronounced near first mode of resonance and insignificant at off-resonance conditions. The effect of excitation amplitude on the fill level is pronounced in the order of 50, 25 and 75% fill levels on sloshing oscillation, sloshing force and spectral energy. The sloshing force is found to be about 9.32, 26.03 and 26.43Â N for the excitation parameters of forcing frequency (f) that equals to first mode sloshing frequency (f1) and amplitude of excitation Aâ€‰=â€‰8Â mm. The sloshing tank with 75% fill depth experiences more sloshing force on its containment than 25 and 50% fill depths. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Scale effects of sloshing on a sway excited rectangular ship tank
(Royal Institution of Naval Architects membership@rina.org.uk 10 Upper Belgrave Street London SW1X 8BQ, 2019) Shri, S.; Nasar, T.
Sloshing behavior of liquid in containers is one of the fundamental fluid-structure interactions. Liquid sloshing is associated with various dynamical systems and engineering problem, such as the liquid cargo slosh in ships and trucks of transporting liquid, oil oscillation in large tanks, and water oscillation in a reservoir due to ground and wind acceleration, etc. Oscillation of water in a partially filled container due to the external forces or external disturbances is called as sloshing. An experimental study has been carried out to study the scale effects on sloshing dynamics of liquid in a partially filled sway excited rectangular tank. The model tanks considered in this study are 1:43, 1:57 and 1:86. The aspect ratio (hs/L) of 0.1625, 0.325, 0.4875 are adopted which represents 25%, 50% and 75% of liquid fill levels of tank depth respectively. A sloshing tank is positioned on the shake table such that during the sway excitations, the sloshing oscillations occurs along the longitudinal axis. Time histories of sloshing oscillations and sloshing force are measured using load cells and wave probes, respectively. The effect of excitation frequencies and excitation amplitudes on sloshing force and sloshing oscillations is discussed here. Â© 2019: The Royal Institution of Naval Architects
SLOSHING DYNAMICS IN SWAY EXCITED RECTANGULAR SCALED TANKS
(Department of Naval Architecture and Marine Engineering, 2023) Shri, S.; Nasar, T.
This paper presents the result obtained from a series of experiments conducted on different scaled rectangular tanks mounted on shake table, to study the scale effects of sloshing with sway excited motion. Three different tanks of model scales of 1:86, 1:57 and 1:43 are considered for present study. The tests are carried out for the aspect ratio (hs/l, where hs liquid depth and l is the length of the tank)of 0.1625, 0.325, and 0.4875 which represents 25%, 50% and 75% of liquid fill levels, respectively. The sloshing oscillations occur in the longitudinal axis when subjected to sway excitations. Sloshing forces and sloshing oscillation time histories are measured using load cells and wave probes, respectively. The effect of excitation amplitudes and excitation frequencies on sloshing oscillations and sloshing force are presented herein. It is found that violent sloshing is experienced for 50% filled condition irrespective of scaled tanks, excitation amplitudes and excitation frequencies. The sloshing force is maximum in 1:43 scaled tank than other scaled sloshing tanks irrespective of the excitation frequency and amplitude for 50% fill level. Based on the experimental observations and analysis of results, it is concluded that proportionate volume of water and tank size decides the severity of sloshing in the partially filled moving tanks. © 2022.
Sloshing Dynamics in Sway Excited Rectangular Scaled Tanks; 横荡激励下矩形缩比罐中的液体晃动力学
(Editorial Board of Journal of Harbin Engineering, 2023) Sahaj, K.V.; Shri, S.; Nasar, T.
The present paper presents the sloshing oscillation behaviour and sloshing force in three different tanks of model scales of 1:86, 1:57 and 1:43. The rectangular tank is mounted on shake table, to study the scale effect of sloshing with sway excited motion. The tests are carried out for the aspect ratio (hs/l, where hs liquid depth and l is the length of the tank) of 0.162 5, 0.325, and 0.487 5 which represents 25%, 50% and 75% of liquid fill levels, respectively. Seventeen excitation frequencies ranging from 0.456 6 Hz to 1.975 7 Hz are considered, which covers up to the fifth sloshing mode. The sloshing oscillations occurs in the longitudinal axis when subjected to sway excitations. An experimental setup is designed and devised to measure sloshing force by the concept of ballast mass. The inertia forces are measured by load cells and sloshing oscillation time histories are measured by capacitance probes. It is found that violent sloshing is experienced for 50% filled condition irrespective of scaled tanks, excitation amplitudes and excitation frequencies. The sloshing force is maximum in 1:43 scaled tank than other scaled sloshing tanks irrespective of the excitation frequency and amplitude for 50% fill level. Based on the experimental observations and analysis of results, it is concluded that proportionate volume of water and tank size decides the severity of sloshing in the partially filled tanks. © 2023, Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature.