In the present paper, two-dimensional violent sloshing flows are simulated by a constraint interpolation profile method combined unified procedure (CCUP) and smoothed particle hydrodynamics (SPH) method. The present CCUP scheme is based on finite difference method and constrained interpolation profile (CIP) method. Freesurface flows are considered as multi-phase problems with air and water phases. The tangent of hyperbola for interface capturing (THINC) scheme is applied to trace free-surface profile. The SPH method based on Lagrangian formulation is also applied in this study to simulate violent fluid deformations due to sloshing. Numerical simulations are carried out for partially filled 2-D tanks under harmonic sway and roll motions with various water depths and frequencies, and the results are compared for both methods.
Sloshing phenomena considered in engineering problems involve violent resonant free-surface flows with strong nonlinear behavior. In such cases, sloshing flows cause local impact pressure. Thus, the prediction of slosh-induced loads becomes an essential element in the design of LNG carriers, LNG related offshore structures, and ships with liquid cargo such as VLCC. A lot of studies on ship sloshing problem were carried out in 1970s and early 1980s. Recently, the demand for sloshing analysis is rising again for the design of much larger LNG carriers and LNG floating-production-storage-offloading (LNG-FPSO) vessels. Many numerical studies on sloshing flows have been reported during last two decades. Some representative work have been introduced by Faltinsen (1978, 2000), Bridges (1982), Mikelis (1984), Wu (1998) and Kim (2001). Despite numerous studies, few methods are applicable for actual engineering use such as the simulation of violent flows and the prediction of impact loads. In this study, two different numerical methods, constraint-interpolationprofile (CIP)-based finite difference method called CIP-combined and unified procedure (CCUP), and smoothed-particle-hydrodynamics (SPH) method, are considered to solve violent sloshing problem.
