Numerical Simulation of Behavior of Sand Particles during High-Speed Penetration with Particle Method

The phenomena that occur during high-speed penetration of a projectile into sand particles are interesting subjects in engineering. The macro-scale research themes are the behavior of the ejected sand particles and the progress of the high-speed projectile, while the micro-scale research themes are the deformation and fragmentation of a single sand particle. Studies of these unique phenomena were conducted using both experiments and numerical simulation. Although accurate simulation of the behavior of sand particles during high-speed penetration is difficult because sand particles have characteristics of both fluids and solids, the reproducibility of the actual phenomena has improved in recent years with the development of particle methods. In our research, we conducted simulations of the phenomena using Smoothed Particle Hydrodynamics (SPH), which is a mesh-free, particle-based method. The results showed the possibility of accurate reproduction during high-speed projectile penetration into sand particles at the macro-scale.

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Numerical Simulation of an Ice Beam in Four-Point Bending Using SPH

Volume 10: Polar and Arctic Science and Technology ◽

10.1115/omae2014-23228 ◽

2014 ◽

Cited By ~ 2

Author(s):

Jitapriya Das ◽

Dražen Polić ◽

Sören Ehlers ◽

Jørgen Amdahl

Keyword(s):

Numerical Simulation ◽

Sea Ice ◽

Failure Time ◽

Free Particle ◽

Particle Method ◽

Primary Objective ◽

Bending Test ◽

Four Point Bending ◽

Mesh Free ◽

Mesh Free Method

The flexural strength of sea ice is crucial for ice going vessels and hence the knowledge of mechanical properties of ice is very important for the design of such vessels. The primary objective of this investigation is the numerical simulation of sea ice in four-point bending using Smoothed Particle Hydrodynamics (SPH), which being a mesh free method offers a lot of advantages over traditional grid-based approaches. The numerical results will be compared to earlier simulations of in-situ four-point bending test results in terms of force, displacement and failure time. Further, the comparison of the SPH-based numerical simulations with the available literature will serve as a basis to discuss the potential advantages and shortcomings of the mesh free particle method used to model flexural failure of sea ice.

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Flow over sills by the MPS mesh-free particle method

Journal of Hydraulic Research ◽

10.1080/00221686.2011.607302 ◽

2011 ◽

Vol 49 (5) ◽

pp. 649-656 ◽

Cited By ~ 14

Author(s):

Aidin Jabbari Sahebari ◽

Yee-Chung Jin ◽

Ahmad Shakibaeinia

Keyword(s):

Free Particle ◽

Particle Method ◽

Mesh Free

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Optimization of Moving Particle Semi-Implicit (MPS) Method and Studying of Flow Instability

Volume 8: Computational Fluid Dynamics (CFD); Nuclear Education and Public Acceptance ◽

10.1115/icone26-81948 ◽

2018 ◽

Author(s):

Kailun Guo ◽

Ronghua Chen ◽

Suizheng Qiu ◽

Wenxi Tian ◽

Guanghui Su ◽

...

Keyword(s):

Multiphase Flows ◽

Flow Instability ◽

Free Particle ◽

Particle Method ◽

Severe Accident ◽

Particle Methods ◽

Two Phase ◽

Mps Method ◽

Viscosity Term ◽

Moving Particle

Multiphase flow widely exists in the nature and engineering. The two-phase flow is the highlight of the studies about the flow in the vessel and steam explosion in nuclear severe accidents. The Moving Particle Semi-implicit (MPS) method is a fully-Lagrangian particle method without grid mesh which focuses on tracking the single particle and concerns with its movement. It has advantages in tracking complex multiphase flows compared with gird methods, and thus shows great potential in predicting multiphase flows. The objective of this thesis is to develop a general multiphase particle method based on the original MPS method and thus this work is of great significance for improving the numerical method for simulating the instability in reactor severe accident and two-phase flows in vessel. This research is intended to provide a study of the instability based on the MPS method. Latest achievements of mesh-free particle methods in instability are researched and a new multiphase MPS method, which is based on the original one, for simulating instability has been developed and validated. Based on referring to other researchers’ papers, the Pressure Poisson Equation (PPE), the viscosity term, the free surface particle determination part and the surface tension model are optimized or added. The numerical simulation on stratification behavior of two immiscible flows is carried out and results are analyzed after data processing. It is proved that the improved MPS method is more accurate than the original method in analysis of multiphase flows. In this paper, the main purposes are simulating and discussing Rayleigh-Taylor (R-T) instability and Kelvin-Helmholtz (K-H) instability. R-T and K-H instability play an important role in the mixing process of many layered flows. R-T instability occurs when a lower density fluid is supported by another density higher fluid or higher density fluid is accelerated by lower density fluid, and the resulting small perturbation increases and eventually forms turbulence. K-H instability is a small disturbance for two different densities, such as waves, at the interface of the two-phase fluid after giving a fixed acceleration in the fluid. Turbulence generated by R-T instability and K-H instability has an important effect in applications such as astrophysics, geophysics, and nuclear science.

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Influence of Pipeline Inclination on Hydraulic Conveying of Sand Particles

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D ◽

10.1115/imece2012-93199 ◽

2012 ◽

Cited By ~ 1

Author(s):

Ahmed Mohamed Nossair ◽

Peter Rodgers ◽

Afshin Goharzadeh

Keyword(s):

Particle Transport ◽

High Speed ◽

Sand Dune ◽

Sand Particle ◽

Hydrocarbon Production ◽

Production Wells ◽

Load Transport ◽

Bed Load Transport ◽

Sand Particles ◽

Dune Dynamics

The understanding of sand particle transport by fluids in pipelines is of importance for the drilling of horizontal and inclined hydrocarbon production wells, topside process facilities, infield pipelines, and trunk lines. Previous studies on hydraulic conveying of sand particles in pipelines have made significant contributions to the understanding of multiphase flow patterns, pressure drop and particle transport rate in horizontal pipelines. However, due to the complexity of the flow structure resulting from liquid-sand interactions, the mechanisms responsible for bed-load transport flow for hydraulic conveying of sand particles have not been extensively studied in inclined pipelines. This paper presents an experimental investigation of hydraulic conveying of sand particles resulting from a stationary flat bed in both horizontal and +3.6 degree upward inclined pipelines. The characteristics of sand transportation by saltation from an initial sand bed are experimentally visualized using a transparent Plexiglas pipeline and high-speed digital photography. The dune formation process is assessed as a function of pipeline orientation. Based on the visualized dune morphology, pipeline inclination is found to have a significant influence on hydraulic conveying of sand dune dynamics (i.e., dune velocity), as well as sand dune geometry (i.e., dune pitch and characteristic dune angles).

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A Mesh-Free Particle Method for Transient Full-Wave Simulation

IEEE Transactions on Magnetics ◽

10.1109/tmag.2007.892411 ◽

2007 ◽

Vol 43 (4) ◽

pp. 1333-1336 ◽

Cited By ~ 8

Author(s):

Guido Ala ◽

Elisa Francomano ◽

Adele Tortorici ◽

Elena Toscano ◽

Fabio Viola

Keyword(s):

Free Particle ◽

Particle Method ◽

Wave Simulation ◽

Full Wave ◽

Mesh Free

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Disease contagion models coupled to crowd motion and mesh-free simulation

Mathematical Models and Methods in Applied Sciences ◽

10.1142/s0218202521400066 ◽

2021 ◽

pp. 1-19

Author(s):

Parveena Shamim Abdul Salam ◽

Wolfgang Bock ◽

Axel Klar ◽

Sudarshan Tiwari

Keyword(s):

Free Particle ◽

Numerical Test ◽

Particle Method ◽

Coupled System ◽

Disease Spread ◽

Force Model ◽

Social Force ◽

Pedestrian Dynamics ◽

Mesh Free ◽

Crowd Motion

Modeling and simulation of disease spreading in pedestrian crowds have recently become a topic of increasing relevance. In this paper, we consider the influence of the crowd motion in a complex dynamical environment on the course of infection of the pedestrians. To model the pedestrian dynamics, we consider a kinetic equation for multi-group pedestrian flow based on a social force model coupled with an Eikonal equation. This model is coupled with a non-local SEIS contagion model for disease spread, where besides the description of local contacts, the influence of contact times has also been modeled. Hydrodynamic approximations of the coupled system are derived. Finally, simulations of the hydrodynamic model are carried out using a mesh-free particle method. Different numerical test cases are investigated, including uni- and bi-directional flow in a passage with and without obstacles.

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