Accuracy of Non-inertial Reference Frame on Sloshing Phenomenon with Intelligent Control in Rectangular Tanks Under Oblique Excitation

Abstract

In this paper, the 3D numerical modelling of the sloshing phenomenon in rectangular tanks was conducted under the oblique excitation. The effect of the aspect ratio on the maximum side wall, bed hydrodynamic forces and the maximum water run up over the side wall investigated under the intelligent controls. The non-inertial reference frame method was used to apply the dynamic excitation to the fluid body, and the volume of fluid (VOF) method was used to define the water surface variations. The experimental benchmark test case was used to verify the non-inertial reference frame method and effect of the excitation direction, frequency and amplitude were studied. Results show that the non-inertial reference method is more accurate than other method to predict the sloshing phenomenon. Using Flow-3D software, intelligent controls and big data algorithms the optimal numerical results are obtained. Then to study the effect of the geometrical parameters on the sloshing phenomenon, three rectangular tanks with different length/width ratio were considered and for various frequencies ratio were loaded under harmonic excitations. Based on these considerations, for all cases the maximum pressure force on the side wall occurs when the excitation is parallel with the side wall, and the maximum water surface occurs for the longitudinal excitation. By increasing the length/width ratio the maximum pressure force on the side wall decreases and on the other hand the maximum pressure force on the tank bottom increases.