Abstract
Recently, when earthquake occurs, damage to container due to fluid motion in the container has been discovered and reported. Under this type of condition fluid surface in the container oscillates greatly and the motion of fluid becomes a three-dimensional complex flow with a breaking wave. Therefore, the necessity to develop a three-dimensional numerical simulation method for solving nonlinear hydraulics phenomena is very important.This paper shows the changes of vortex strength using a three-dimensional particle method subject to the oscillation fluid in a cylindrical container, and comparing with the experimental results the relation between vortex strength and fluid motion pattern is discovered and characterized. In addition, this study shows the transaction of motion pattern depending on depth radius ratio through to the relation between vibration frequency and depth radius ratio.
