| Under seismic excitation,the heavy liquid metal(HLM)in the partially filled nuclear reactor can be set to motion,known as sloshing.Fast reactor is one of the fourth generation advanced nuclear reactor type.Free surface in main vessel of pool-type fast reactor could slosh with height up to a few meters under seismic condition,which will cause impact load on main vessel wall.In this present study,sloshing behavior in a 3-D annular tank investigated using ANSYS-CFX(Version 16.0)software,subjected to various seismic excitation frequencies,with and without baffles conditions.To simulate 3D incompressible viscous two-phase flow in a tank partially filled with liquid,the volume of fluid(VOF)method based on the finite volume method has been utilized.External Seismic excitations to the tank are imposed horizontally in the x-direction of the tank by using expression.Simulation is being carried out for 10 sec by using variable time method.The purpose of the present work is to examine computationally the effect of earthquake frequency content on the seismic behavior of main vessel of fast reactors representative by annular tank to check variation of impact pressure relative to the different location,and affects the sloshing phenomenon,when the tank with and without vertical baffle,seismically excited with frequency equal to natural frequency of the liquid in the tank.The analysis shows that if the tank subjected to seismic excitations at resonant excitation Frequencies,liquid sloshing will become extreme and impact pressures on the wall will be intensified.Result shows that after tank is equipped with vertical baffles the sloshing loads is reduced and almost linear behavior of the free surface is observed in each section.Time variation of pressure in relation to different locations also investigated by monitoring at certain point in tank wall. |
