Multiphase smoothed particle hydrodynamics modeling of forced liquid sloshing
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Abstract In the present paper, an improved multiphase weakly compressible smoothed particle hydrodynamics model for balancing the accuracy and stability of the long‐term simulations is proposed to model the forced liquid sloshing in a tank. The governing equations of the multiphase flow are discretized by considering the density discontinuity over the interface. To suppress the pressure oscillation, a previous density correction term suitable only for single‐phase problems is modified and incorporated into the discrete continuity equation to suit multiphase problems. The modified density reinitialization algorithm is implemented to calculate the pressure of the boundary particles, and the coupled dynamic solid boundary treatment (SBT) is employed to determine the rigid wall condition. For convenience, a numerical probe algorithm is also proposed to accurately measure the wave height. The present model exhibits a better numerical stability than the previous multiphase smoothed particle hydrodynamics model, and its results well confirm with the experimental data of the forced sloshing of liquid excited by swaying or rolling.Keywords:
Smoothed Particle Hydrodynamics
Slosh dynamics
Multiphase flow
Discontinuity (linguistics)
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With the development of offshore LNG production and offloading,sloshing of LNG in partially filled tanks has become an important research subject for the offshore industry.In this paper SPH(Smoothed Particle Hydrodynamics) method is used for the numerical simulation of large amplitude liquid sloshing in two dimensional liquid tanks.The computed wave surface profile is compared with experimental results,well in agreement.The feasibility of this method to be used to simulate large amplitude liquid sloshing is validated.
Slosh dynamics
Smoothed Particle Hydrodynamics
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Abstract The sloshing phenomenon is one challenging event in fluid-structure interaction especially for the liquid carrier such as a ship. Sloshing can endanger ships when there is energetic sloshing with volatile liquid inside the tank. One of the LNG carriers is membrane type which the tank is prismatic. The study aims to reproduce long-duration sloshing using a prismatic tank. The particle method so-called smoothed particle hydrodynamics is used to deal with long-duration sloshing. To accommodate of experiment condition a two-phase SPH is used. To accelerate SPH computation, a GPU solver is used in this study. The hydrostatic pressure from SPH is compared with an analytic solution and dynamics pressure is compared with experimental data to validate the results. The result shows SPH has good accuracy for hydrostatic pressure and dynamics pressure shows a similar trend to experiment with spurious pressure. Finally, free surface deformation has a tendency similar to experiment with void of air trapped in the water that can capture by SPH.
Slosh dynamics
Smoothed Particle Hydrodynamics
Hydrostatic equilibrium
Impact pressure
Hydrostatic pressure
Free surface
Fluid–structure interaction
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Smoothed Particle Hydrodynamics
Multiphase flow
Particle (ecology)
Incompressible Flow
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Slosh dynamics
Smoothed Particle Hydrodynamics
Free surface
Impact pressure
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Slosh dynamics
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Free surface
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In order to investigate the effects of liquid sloshing inside a spherical tank, a numerical model called “Smoothed Particle Hydrodynamics” was used. Firstly, the accuracy of the method was examined with the help of previously done experiments. The SPH is a Lagrangian particlebased method and very effective to model nonlinear problems as in liquid sloshing. This conference paper represents the outcomes of an ongoing PhD project.
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This study aimed to validate the single-phase and two-phase smoothed particle hydrodynamics (SPH) on sloshing in a tank. There have been many studies on sloshing in tanks based on meshless particle methods, but few researchers have used a large number of particles because there is a limitation on the total number of particles when using only CPUs. Additionally, few studies have investigated the influence of air phase on tank sloshing based on two-phase SPH. In this study, a dedicated sloshing experiment was conducted at the National Research Institute of Fishing Engineering using a prismatic tank with a four-degrees-of-freedom forced oscillation machine. Three pressure gauges were used to measure local pressure near the corners of the tank. The sloshing experiment was repeated for two different filling ratios, amplitudes, and frequencies of external oscillation. Next, a GPU-accelerated three-dimensional SPH simulation of sloshing was performed using the same conditions as the experiment with a large number of particles. Lastly, two-dimensional sloshing simulations based on single-phase and two-phase SPH were carried out to determine the importance of the air phase in terms of tank sloshing. Based on systematic comparisons of the single-phase SPH, two-phase SPH, and experimental results, this paper presents a detailed discussion of the role of air-phase in terms of sloshing. The currently achievable accuracy when using SPH is demonstrated together with a few sensitivity analyses of SPH parameters.
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Abstract The sloshing phenomenon is one of the events in a liquid carrier vehicle such as airplanes and ships. Sloshing is a dangerous phenomenon because sloshing can effect ship motions that create excessive motion in liquid carrier vehicles. Long duration sloshing is challenging problems to solve using smoothed particle hydrodynamics (SPH). Stable, accurate, and reliable computation time is tried to achieve by many researchers. In this study, long-duration sloshing in the prismatic tank is tried to reproduce using single-phase and two-phase SPH. Firstly, the experiment is carried out using prismatic tank, with three pressure sensors, and a forced oscillation machine. In this study, only roll motion is used to reproduce hydrodynamics pressure with a low filling ratio. The results show SPH could reproduce fairly hydrodynamics pressure with spurious pressure oscillation. Static pressure is well reproduced by SPH.
Slosh dynamics
Smoothed Particle Hydrodynamics
Oscillation (cell signaling)
Impact pressure
Spurious relationship
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Predicting the response of liquefied natural gas (LNG) contained in vessels subjected to external waves is extremely important to ensure the safety of the transportation process.In this study, the coupled behavior due to ship motion and liquid tank sloshing has been simulated by the Smoothed-Particle Hydrodynamics (SPH) method.Firstly, the sloshing flow in a rectangular tank was simulated and the related loads were analyzed to verify and validate the accuracy of the present SPH solver.Then, a three-dimensional simplified LNG carrier model, including two prismatic liquid tanks and a wave tank, was introduced.Different conditions were examined corresponding to different wave lengths, wave heights, wave heading angles, and tank loading rates.Finally, the effects of liquid tank loading rate on LNG ship motions and sloshing loading were analyzed, thereby showing that the SPH method can effectively provide useful indications for the design of liquid cargo ships.
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The purpose of the research described here is to study the implementation of Smoothed Particle Hydrodynamics (SPH) algorithms as an adequate means for propellant slosh simulations in 1g and 0g environments. The dualSPHysics solver has been adapted for propellant slosh simulations. Simulated sloshing liquid frequency and damping ratio data for 1g cases has been compared to existing experiments for both spherical and prismatic container geometries. The 0g case has been studied to determine what further modifications would be required to obtain realistic simulations results. The findings in this research will be used to create a sloshing simulation to determine torques applied to a cubesat during operations.
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