Large-amplitude Sloshing Research Articles

Dynamic simulation of fluid-structure interaction problems involving large-amplitude sloshing

Dynamic simulation of fluid-structure interaction problems involving large-amplitude sloshing

Large-Amplitude Sloshing in an Oil Tanker with Baffle-Plate/Drilled Holes

The sloshing dynamics in a tank partially filled with liquid oil was simulated in this study. The formulation uses primitive variables on a staggered grid system for solving incompressible Navier-Stokes equations, which are subjected to the distortion of free surface. We made use of a volume of fluid technique to resolve numerical difficulties in association with nonlinear free-surface boundary conditions while a two-dimensional quadratic upwind advection scheme to deal with flux nonlinearities. Two problems, namely the free oscillation and the solitary wave propagation, have been chosen for benchmarking the method presented here. The liquid oscillations under conditions of resonance or nonresonance frequency in an oil tanker containing a perforated baffle plate have been studied extensively for two different liquid levels. Through this simulation, we have found that the degree of sloshing can be mitigated by these baffle plates.

3-D Sloshing Analysis by an Arbitrary Lagrangian-Eulerian Finite Element Method

This paper presents a new Arbitrary Lagrangiae-Eulerian (ALE) finite element method for the analysis of three-dimensional large-amplitude sloshing problems. The present method is composed of three phases, i.e., Phase 1: Purely Lagrangian calculation. Phase 2: Remeshing procedure and Phase 3: Rezoning procedure. By applying these procedures, the present method has succeeded in overcoming the main difficulty of computation in the large-amplitude sloshing analysis. In the Lagrengian calculation, a new fractional step method that satisfies the free-surface boundary condition has been applied, and treatment of the free surface on the multi-sloped wall boundary has been advanced. In the remeshing procedure, a method based on boundary-fitted coordinates is introduced. Numerical results are compared with experimental results, and it is shown that this method is sufficiently accurate to calculate the three-dimensional sloshing. Furthermore, a numerical example of large-amplitude sloshing in a tank with roofs and chamfers illustrates the validity of the method for the computation of large-amplitude sloshing waves whose free surface configuration is a double-valued function.

Notes on the stabilized space-time finite-element formulation of unsteady incompressible flows

This paper gives a review of our research efforts on the stabilized space-time finite element formulation of unsteady incompressible flows, including those involving moving boundaries are interfaces. Iterative solution techniques employed to solve the equation systems resulting from the space-time finite element discretization of these flow problems are also reviewed. Results are presented for certain unsteady flow problems, including large-amplitude sloshing and flows past oscillating cylinders.

Slosh wave excitation in a partially filled rotating tank due to gravity jitters in a microgravity environment

The dynamical behavior of fluids, in particular the effect of surface tension on partially-filled rotating fluids (cryogenic liquid helium and helium vapor), in a full-scale Gravity Probe-B Spacecraft propellant tank without probe imposed by various frequencies of gravity jitters have been investigated. Twelve case studies of slosh wave excitation due to various frequencies of gravity jitters under different rotating speeds of propellant tank and different levels of background gravity environment have been numerically simulated. Results disclose the conditions for the excitation of large amplitude slosh waves which shall be avoided in the design of cryogenic liquid propellant system.