scholarly journals Non-Symmetrical Collapse of an Empty Cylindrical Cavity Studied with Smoothed Particle Hydrodynamics

2021 ◽  
Vol 11 (8) ◽  
pp. 3500
Author(s):  
Andrea Albano ◽  
Alessio Alexiadis
Keyword(s):  
Shock Waves ◽  
Smoothed Particle Hydrodynamics ◽  
Cylindrical Cavity ◽  
High Velocity ◽  
Pressure Field ◽  
Anisotropic Pressure ◽  
Cavity Radius ◽  
Double Peaks ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

The non-symmetrical collapse of an empty cylindrical cavity is modeled using Smoothed Particle Hydrodynamics. The presence of a nearby surface produces an anisotropic pressure field generating a high-velocity jet that hits the surface. The collapse follows a different dynamic based on the initial distance between the center of the cavity and the surface. When the distance is greater than the cavity radius (detached cavity) the surface is hit by traveling shock waves. When the distance is less than the cavity radius (attached cavity) the surface is directly hit by the jet and later by other shock waves generated in the last stages of the of the collapse. The results show that the surface is hit by a stronger shock when distance between the center of the cavity and the surface is zero while showing more complex double peaks behavior for other distances.

Examining a modified algorithm of smoothed particle hydrodynamics for a high velocity perforation of an aluminum beam

Meccanica ◽  
2013 ◽  
Vol 48 (7) ◽  
pp. 1623-1636 ◽  
Author(s):  
Vahab Haghighat Namini ◽  
Nima Amanifard ◽  
Aboulfazl Darvizeh ◽  
Katayoon Mohamadi
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
High Velocity ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Aluminum Beam ◽  
Modified Algorithm

AN IMPLEMENTATION OF THE SMOOTHED PARTICLE HYDRODYNAMICS FOR HYPERVELOCITY IMPACTS AND PENETRATION TO LAYERED COMPOSITES

2013 ◽  
Vol 10 (03) ◽  
pp. 1350056 ◽  
Author(s):  
G. R. LIU ◽  
C. E. ZHOU ◽  
G. Y. WANG
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
High Velocity ◽  
Numerical Solutions ◽  
Equations Of State ◽  
Damage Model ◽  
High Rate ◽  
Material Strength ◽  
Layered Composites ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Driven by applications in the design of protective structure systems, the need to model high velocity impact is becoming of great importance. This paper presents a Smoothed Particle Hydrodynamics (SPH) procedure for 3D simulation of high velocity impacts where high rate hydrodynamics and material strength are of great concern. The formulations and implementations of the Johnson–Cook strength and damage model considering temperature effect, and Mie–Gruneison and Tilloton equations of state are discussed. The performance of the procedure is demonstrated through two example analyses, one modeling a cubic tungsten projectile penetrating a multi-layered target panel and the other involving a sphere perforating a thin plate. The results obtained, with comparisons made to both experimental results and other numerical solutions previously reported, show that our SPH-3D implementation is accurate and reliable for modeling the overall behavior of the high rate hydrodynamics with material strength.

scholarly journals Interaction of Shock Waves with Discrete Gas Inhomogeneities: A Smoothed Particle Hydrodynamics Approach

2019 ◽  
Vol 9 (24) ◽  
pp. 5435 ◽  
Author(s):  
Andrea Albano ◽  
Alessio Alexiadis
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Shock Tube ◽  
Smoothed Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Interaction Of Shock Waves ◽  
Smoothed Particle ◽  
Different Shapes ◽  
The Difference

In this study, we propose a smoothed particle hydrodynamics model for simulating a shock wave interacting with cylindrical gas inhomogeneities inside a shock tube. When the gas inhomogeneity interacts with the shock wave, it assumes different shapes depending on the difference in densities between the gas inhomogeneity and the external gas. The model uses a piecewise smoothing length approach and is validated by comparing the results obtained with experimental and CFD data available in the literature. In all the cases considered, the evolution of the inhomogeneity is similar to the experimental shadowgraphs and is at least as accurate as the CFD results in terms of timescale and shape of the gas inhomogeneity.

scholarly journals Towards a Smoothed Particle Hydrodynamics Algorithm for Shocks Through Layered Materials

2013 ◽  
Author(s):  
Iason Zisis ◽  
Bas van der Linden ◽  
Christina Giannopapa
Keyword(s):  
Shock Waves ◽  
Density Distribution ◽  
Smoothed Particle Hydrodynamics ◽  
Shock Loading ◽  
Numerical Technique ◽  
Layered Materials ◽  
Functionally Graded ◽  
Particle Hydrodynamics ◽  
Graded Material ◽  
Smoothed Particle

Hypervelocity impacts (HVIs) are collisions at velocities greater than the target object’s speed of sound. Such impacts produce pressure waves that generate sharp and sudden changes in the density of the materials. These are propagated as shock waves. Previous computational research has given insight into this shock loading for the case of homogeneous materials. Shock-wave propagation through materials with discontinuous density distribution has not been considered in depth yet. Smoothed Particle Hydrodynamics (SPH) is a numerical technique, which has been extensively used for the simulation of HVIs. It is especially suitable for this purpose as it describes both the solid and fluid-like behavior effectively as well as the violent breakup of the material under impact. In previous studies on SPH, impact loading of composite materials was modeled by homogenization of the material, or under assumption of being a so-called functionally graded material (FGM). Both these models neglect the reflection-transmission effects on the interface between materials of different density. In this paper the shock loading of layered materials is studied. A modification to the standard SPH method is developed and tested, that incorporates materials with purely discontinuous density distribution. The developed method’s performance at simple shock loading cases is investigated; reflection-transmission patterns of shock-waves through layered materials are discussed, along with a parametric study of the governing parameters.

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