Sloshing Simulation of Single-Phase and Two-Phase SPH using DualSPHysics

Abstract

The sloshing phenomenon is one of the free surface flow that can endanger liquid cargo carriers such as ships. Sloshing is defined as the resonance of fluid inside a tank caused by external oscillation. When sloshing is close to the natural frequency of the tank it could endanger ships. Particle method has the advantages to be applied because sloshing is dealing with free surface. One of the particle methods is Smoothed Particle Hydrodynamics (SPH). In this study, compressible SPH was used as a result of the pressure oscillation, which exists because of the effect of density fluctuation as nature of weakly compressible SPH. To reduce pressure noise, a filtering method, Low Pass Filter, was used to overcome pressure oscillation. Three pressure sensors were used in the sloshing experiment with a combination of motions and filling ratios. Only one pressure sensor located in the bottom was used to validate the numerical results. A set of SPH parameters were derived that fit for the sloshing problem. The SPH results show a good agreement with the experiment’s. The difference between SPH and experiment is under 1 % for sway, but a larger difference shows in roll. Low pass filter technique could reduce pressure noise, but comprehensive method needs to develop for general implementation.

Numerical simulation of water wave propagation using DualSPHysics

“…Most researchers use the SPH method in analyzing nonlinear free-surface flow problems and the interactions on solid structures. Such as research on breaking wave modelling and the interaction of coastal structures with water waves [3,4], sloshing in the prismatic tank [5][6][7][8], and the impact of water waves on offshore structures [9]. These studies showed the potential of using SPH method in marine and coastal engineering applications and application for actual problem in engineering field.…”

Sensitivity analysis of SPH parameters for long-distance water wave propagation

“…SPH is a meshless and Lagrangian approach suitable for large deformation problems such as water wave propagation, sloshing, and dam break, and related studies. Application for free surface flow, such as sloshing, was performed for a prismatic tank with and without baffle [1][2][3][4]. The results indicate SPH has good accuracy for violent flow in the sloshing phenomenon.…”

Investigation of Sloshing in Different Tank Shapes using Smoothed Particle Hydrodynamics

“…Sloshing inside a ship's LNG fuel tank was conducted in 3 hours duration in real-time and could provide reasonable local pressure estimations [5]. Multi-phase flow sloshing was performed with δ-SPH and particle shifting technique [6], and a similar study was conducted with a prismatic tank for two and three dimensions of twophase SPH [7,8]. The results showed SPH has good agreement with both quantitative and qualitative, though in three-dimension computation takes time to compare with mesh-based CFD solver.…”