Numerical Model of Oil Film Diffusion in Water Based on SPH Method

Li, Daming; Zhen, Zhu; Zhang, Hongqiang; Li, Yanqing; Tang, Xingchen

doi:10.1155/2019/8250539

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…e oil particles move according to the governing equations, and there is no need to generate meshes in the problem domain. e Lagrangian methods commonly used in oil spill simulation include the SPH (smoothed particle hydrodynamics) method [18][19][20] and the MPS (moving particle semi-implicit) method [21,22]. e meshless method is suitable for simulating the spreading and dispersion of the oil, but it is difficult to track the free surface.…”

Section: Spreading Models Of Oil Spillsmentioning

confidence: 99%

An Improved Particle Number-Based Oil Spill Model Using Implicit Viscosity in Marine Simulator

Qiu

Ren

et al. 2021

Mathematical Problems in Engineering

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Improving the physical realism of oil spill scenes in marine simulators can further enhance the emergency response capabilities of officials in charge and crew members and help reduce losses caused by oil spill disasters. In order to uniformly simulate the spreading, drift, breakup, and merging of oil spills at sea, we propose an improved divergence-free position-based fluid (DFPBF) framework based on the particle number density model. In our DFPBF framework, the governing equations for oil spills and ocean are discretized by Lagrangian particles, and the incompressibility of oil spills and ocean is ensured by solving the divergence-free velocity constraint solver and constant density constraint solver. In order to stably simulate the fate and transport of oil spills with higher viscosity, we introduce an implicit viscosity solution scheme for our DFPBF framework. The implicit solver uses a splitting concept to decouple viscosity solve and adopts an implicit scheme to discretize the integration of viscous force. Moreover, our DFPBF framework can ensure a divergence-free velocity field before applying the implicit viscosity scheme, which avoids the undesired bulk viscosity effects. The simulation results show that our DFPBF framework can stably simulate oil spills of various viscosities, especially high-viscosity crude oils.

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Section: Spreading Models Of Oil Spillsmentioning

confidence: 99%

An Improved Particle Number-Based Oil Spill Model Using Implicit Viscosity in Marine Simulator

Qiu

Ren

et al. 2021

Mathematical Problems in Engineering

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“…The method, being easy to work with a reasonable degree of accuracy, could be extended to complicated physics without much trouble [27]. The SPH method is gaining popularity in a variety of fields and has a wide range of applications such as multiphase flow [25,28], biomedicals [15,17,19,29], fluid-solid interaction [12,[29][30][31][32][33], and hydrodynamic instability [34,35].…”

Section: Smooth Particle Hydrodynamicsmentioning

confidence: 99%

Using Discrete Multiphysics Modelling to Assess the Effect of Calcification on Hemodynamic and Mechanical Deformation of Aortic Valve

2020

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This study proposes a 3D particle-based (discrete) multiphysics approach for modelling calcification in the aortic valve. Different stages of calcification (from mild to severe) were simulated, and their effects on the cardiac output were assessed. The cardiac flow rate decreases with the level of calcification. In particular, there is a critical level of calcification below which the flow rate decreases dramatically. Mechanical stress on the membrane is also calculated. The results show that, as calcification progresses, spots of high mechanical stress appear. Firstly, they concentrate in the regions connecting two leaflets; when severe calcification is reached, then they extend to the area at the basis of the valve.

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“…Smoothed Particle Hydrodynamics (SPH) originally proposed for simulation of astrophysical problems (Gingold and Monaghan, 1977) has been extensively applied for the study of many different fluid flows such as propagation of impulsive landslide waves (Ataie-Ashtiani and Shobeyri, 2008), wave interactions with porous media (Shao, 2010), free surface viscoelastic flows (Ren and Jiang, 2016), multiphase flows (Khayyer et al, 2019), oil film diffusion in water (Li et al, 2019) and underwater explosions (Zhuang and Dong, 2020). In the original version of this method called weakly compressible SPH (WCSPH), the fluid pressure is calculated explicitly by employing an equation of state with a simple computational algorithm.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Solitary Wave Power Absorption by Rotating Slotted Flappers using Incompressible SPH Method

Heydari¹,

Shobeyri²

2023

Preprint

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In this study, the incompressible smoothed particle hydrodynamics (ISPH) as a mature enough mesh-less method is applied to simulate the oscillatory motion of different slotted rotating flappers at the end of a numerical tank under the hydrodynamic load of a solitary wave. The solitary wave can be considered a simple model of ocean waves with long-lasting source of eco-friendly and renewable energy. Many engineering devices such as rotating flappers have been proposed and designed to capture this energy. On the other hand, these structures can also be applied to withstand destructive waves for example Tsunami waves with huge potential to cause severe damage to coastal structures and loss of life in shore regions. This study investigates the performance of a number of 2-D rotating bottom-hinged flappers slotted with different patterns representing a new conceptual model of a wave energy absorber device capable of protecting coastal structures. With providing structural facilities, various slotting patterns can be arranged for a single flapper to have appropriate performance for different wave conditions with the lowest construction cost. Based on the obtained numerical results, it has been found that the spring stiffness of the flapper has the most important physical parameter determining the amount of wave power extraction. In addition to this, the spring friction also has a significant effect on the dissipation of the absorbed power. The slotted flappers also show different rotational motion with less captured power in comparison with the solid flapper. Several physical properties such as the slotted area provided in the flapper and the corresponding pattern, the spring stiffness and friction and other related properties must be determined to protect desired structures at the predefined level and capture maximum energy as much as possible. The findings of this research can be used as a preliminary guide to design more realistic 3-D protective flappers for complex flow conditions.

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Numerical Model of Oil Film Diffusion in Water Based on SPH Method

Cited by 7 publications

References 41 publications

An Improved Particle Number-Based Oil Spill Model Using Implicit Viscosity in Marine Simulator

An Improved Particle Number-Based Oil Spill Model Using Implicit Viscosity in Marine Simulator

Using Discrete Multiphysics Modelling to Assess the Effect of Calcification on Hemodynamic and Mechanical Deformation of Aortic Valve

Numerical Simulation of Solitary Wave Power Absorption by Rotating Slotted Flappers using Incompressible SPH Method

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