Two-phase SPH simulation of fluid–structure interactions

Gong, Kai; Shao, Songdong; Liu, Hua; Wang, Benlong; Tan, Soon Keat

doi:10.1016/j.jfluidstructs.2016.05.012

Cited by 108 publications

(34 citation statements)

References 38 publications

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“…It poses a great challenge for these factors being considered properly and implemented in a numerical method. [28][29][30] The meshless smoothed particle hydrodynamics (SPH) method [31][32][33][34] has advantages to deal with the nonlinear interaction with large free-surface deformation, 35,36 violent impact, 37,38 and other nonlinear phenomena. 39,40 A wide validation of the SPH model against different sloshing flow conditions was conducted.…”

Section: Article Scitationorg/journal/phfmentioning

confidence: 99%

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

et al. 2019

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The flooding of a damaged ship in waves is a complex process, often coupled with the internal and external liquid motion together with the ship hull motion. Paramount to the operation safety, in order to improve the prediction accuracy of ship motion during the flooding process, the strip theory is applied to study the dynamic response of the damaged ship in beam seas; a smoothed particle hydrodynamics (SPH) model is developed to consider the coupling effects of various factors including internal sloshing of intact cabins and damaged cabins and external waves. The numerical wave tank with a perfectly matched layer absorbing boundary condition is established and validated by the experimental results. The detailed sensitivity study is carried out focusing on the effects of damaged opening sizes, the relative position of opening, and the incident wave and the liquid loading conditions on the dynamic response of the damaged ship in regular beam waves. It is observed that the flooding process was slowed down and interrupted by the water exchanges at the damaged opening due to the dynamic motion. Compared with the opening facing the incident wave, the back one endangered the ship pronouncedly with large amplitude and frequency roll motion. It is also revealed that the liquid tank in the damaged ship imposes a significant influence on its rolling response. It is further demonstrated that the present SPH model is capable of handling the nonlinear phenomenon in a flooding process of a damaged ship.Published under license by AIP Publishing. https://doi.

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Section: Article Scitationorg/journal/phfmentioning

confidence: 99%

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

et al. 2019

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“…To examine the effect of particle filtering for the simulation of interaction between the multi-phase fluids and the moving rigid body involving violent multi-interface deformation, an experiment of wedge falling into calm two-layer water-oil fluid is carried out by following Gong et al (2016). To absorb the disturbance on the wall boundary, sponge layers were placed along the lateral and bottom boundary of the tank with a thickness of about 0.02 m (Fig.…”

Section: Validating Wedge Falling Into Multi-fluidmentioning

confidence: 99%

Improved SPH simulation of spilled oil contained by flexible floating boom under wave–current coupling condition

Shen

Chen

et al. 2018

Journal of Fluids and Structures

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A multi-phase Smoothed Particle Hydrodynamics (SPH) method is developed to model the failure process of a flexible oil boom. An algorithm is proposed based on the dynamic boundary particles (DBPs) for preventing the particle disorders during the multi-fluid particle movement around the solid boundary. The improved multi-phase SPH model is firstly validated by the experimental data of a wedge falling into a two-layer oil-water fluid. Then a numerical wave-current flume is established with an active absorbing piston-type wave generator and a circulating current system. The model reliability is validated against the measured vertical profiles of velocity. Simulation of the flexible floating boom movement is implemented by introducing a Rigid Module and Flexible Connector (RMFC) multi-body system. The model is finally applied to the simulation of movement of a flexible floating boom in containing industrial gear oil under the combined waves and currents. Good agreements are obtained between the SPH modeling results and the experimental data in terms of the ambient wave-current field, hydrodynamic responses of the 2 floating body and evolution process of the oil slick for the flexible boom. The hydrodynamic responses and containment performances of the flexible floating boom are also compared with those of the rigid one. It is found from both the experimental and numerical results that two vortices of the water phase exist in the front and rear of the boom skirt and the size of the front vortex decreases with an increase of the current velocity while the wake vortex is reversed. It is also found that the skirt of the flexible boom has a larger magnitude of the swaying and rolling than the rigid one and the maximum quantity of the escaped oil of a flexible boom within one wave cycle is about 5% more than a rigid one under the present test conditions.

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“…In summary, positive background pressure can stabilise SPH by suppressing unphysical voids, but it also introduces error, and the optimum trade-off between these effects is not clear. To date there has been no study on the application of background pressure in single phase flows with a free surface [17,24,25,26], since in the absence of surface tension the pressure at the free surface must be zero in weakly-compressible SPH [27,28].…”

Section: Introductionmentioning

confidence: 99%

Application of background pressure with kinematic criterion for free surface extension to suppress non-physical voids in the finite volume particle method

Moghimi¹,

Quinlan²

2019

Engineering Analysis with Boundary Elements

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Lagrangian particle methods such as smoothed particle hydrodynamics (SPH) and the finite volume particle method (FVPM) can suffer from non-physical voids in the spatial discretisation, due to the inability of numerical particles to deform as continuum fluid elements can. It is known that the situation can be improved for wall-bounded flows in SPH by adding a uniform background pressure to ensure positive absolute pressure everywhere. In this article, we investigate the application of background pressure in FVPM, and show that numerical voids grow under negative pressure and collapse under positive pressure. To use this technique in free-surface flow, however, the background pressure must be applied as an atmospheric pressure at the free surface. A kinematic criterion for free surface extension (KCFSE) to differentiate physical free surfaces from new numerical voids has been developed, supplementing the inherent capability of FVPM to identify free-surface particles robustly. The novel method enables background pressure to be applied at physical free surfaces and throughout the fluid, but not in non-physical voids, facilitating the suppression of such spurious voids. The KCFSE is validated for a translating square cylinder inside a rectangular numerical domain, with and without a free surface, and liquid in an oscillating rectangular tank.

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Two-phase SPH simulation of fluid–structure interactions

Cited by 108 publications

References 38 publications

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

Smoothed particle hydrodynamics (SPH) model for coupled analysis of a damaged ship with internal sloshing in beam seas

Improved SPH simulation of spilled oil contained by flexible floating boom under wave–current coupling condition

Application of background pressure with kinematic criterion for free surface extension to suppress non-physical voids in the finite volume particle method

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