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A parameter-free total Lagrangian smooth particle hydrodynamics algorithm applied to problems with free surfaces Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-18 Kenny W. Q. Low, Chun Hean Lee, Antonio J. Gil, Jibran Haider, Javier Bonet
This paper presents a new Smooth Particle Hydrodynamics computational framework for the solution of inviscid free surface flow problems. The formulation is based on the Total Lagrangian description of a system of first-order conservation laws written in terms of the linear momentum and the Jacobian of the deformation. One of the aims of this paper is to explore the use of Total Lagrangian description
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True shape modeling of bio-particulate matter flow in an aero-cyclone separator using CFD–DEM simulation Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-12 Mahmoud A. El-Emam, Ling Zhou, Wei Dong Shi, Chen Han
The multi-phase flow of air and bio-particulate matter exists in many biological and environmental systems such as aerodynamic separating devices, fluidized bed combustion, and feed processing machinery. Integration of the computational fluid dynamics (CFD) and discrete element method (DEM) codes was performed to study bio-particle loading ratios' effect on the cyclone device performance. Every individual
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VisualSPHysics: advanced fluid visualization for SPH models Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-12 O. García-Feal, A. J. C. Crespo, M. Gómez-Gesteira
VisualSPHysics, an open-source tool for creating realistic visualizations of smoothed particle hydrodynamics (SPH) simulations, is presented here. The proposed approach is used to import SPH simulations (from DualSPHysics code) into 3D graphics software (Blender) and supports a wide range of visual effects (realistic lighting and materials, texturing, motion blur and foam simulation). The tool features
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Elastic calibration of a discrete domain using a proper generalized decomposition Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-12 J. Girardot, E. Prulière
Current discrete/lattice methods can simulate a continuous mechanical behavior thanks to a network of bonds. The main drawback of these approaches is the need of a calibration process to link the emerging behavior of the structure and the parameters of the local mechanical bond. It is proposed in this work to use a fast and recent reduction model technique to build once and for all an exhaustive data
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A 3D DEM simulation to study the influence of material and process parameters on spreading of metallic powder in additive manufacturing Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-05 K. Marchais, J. Girardot, C. Metton, I. Iordanoff
The aim of this work is to understand the granular behavior of metal powder during the spreading phase of the LBM process in order to study the effect of powder properties and process parameters on the quality of the layer deposited before laser fusion. This is a numerical work performed with simulations based on the discrete element method where each powder grain is simulated. The numerical model
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Investigation of the grain breakage behaviour of 2D granular materials with disordered pore distribution Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-03 Quanshui Huang, Wei Zhou, Gang Ma, Jiangzhou Mei, Kun Xu
Granular materials have been widely used in the field of geotechnical engineering. Being one of the intrinsic properties of granular materials, the internal grain porosity greatly affects their mechanical properties, grain crushing in particular. In this article, the single porous grains with different degrees of disordered pore distribution were generated and fully investigated with discrete element
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Numerical analysis of the brittle–ductile transition of deeply buried marble using a discrete approach Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-03 Yiping Zhang, Chong Shi, Yulong Zhang, Junxiong Yang, Xiao Chen
In high geostress areas, rocks tend to experience plastic deformation processes and show ductility. Therefore, the study of the mechanical properties of rocks, especially the post-peak behavior, is crucial for underground geotechnical engineering. For this reason, the macroscopic mechanical property of marble is studied by using the PFC/PBM numerical method. An improved numerical marble sample with
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Producing 3D friction loads by tracking the motion of the contact point on bodies in mutual contact Comp. Part. Mech. (IF 1.696) Pub Date : 2021-01-02 Luning Fang, Dan Negrut
We outline a phenomenological model to assess friction at the interface between two bodies in mutual contact. Although the approach is general, the application inspiring the approach is the discrete element method. The kinematics of the friction process is expressed in terms of the relative 3D motion of the contact point on the two surfaces in mutual contact. The model produces expressions for three
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High-stress impact–abrasion test by discrete element modeling Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-22 Edouard Izard, Haithem Ben Hamouda, John Vande Voorde
This work presents a discrete element model (DEM) of the impeller–tumbler wear test in order to investigate high-stress impact–abrasion mechanisms on steel plates with the use of abrasive granite particles. A DEM calibration procedure of the granite particles is first performed to set particle-scale DEM parameters such as particle shape, density and frictions. The simulations of the impeller–tumbler
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A particle packing parallel geometric method using GPU Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-22 Lucas G. O. Lopes, Diogo T. Cintra, William W. M. Lira
The purpose of this paper is to present a methodology for obtaining granular models from a GPU parallel implementation of the geometric separation particle packing strategy. This methodology is suitable for the generation of large-scale granular models used in discontinuous media simulations. The proposed approach uses disk-shaped particles (two-dimensional approach) and parallelization mechanisms
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Molecular dynamics performance for coronavirus simulation by C, N, O, and S atoms implementation dreiding force field: drug delivery atomic interaction in contact with metallic Fe, Al, and steel Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-17 Aliakbar Karimipour, Ali Amini, Mohammad Nouri, Annunziata D’Orazio, Roozbeh Sabetvand, Maboud Hekmatifar, Azam Marjani, Quang-vu Bach
Coronavirus causes some illnesses to include cold, COVID-19, MERS, and SARS. This virus can be transmitted through contact with different atomic matrix between humans. So, this atomic is essential in medical cases. In this work, we describe the atomic manner of this virus in contact with various metallic matrix such as Fe, Al, and steel with equilibrium molecular dynamic method. For this purpose, we
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Optimized advance front method of packing dense ellipse for generating the convex polygon structure statistically equivalent with real material Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-10 Libing Du, Xinrong Liu, Yafeng Han, Zhiyun Deng, Yiliang Tu
A new constructive method, called optimized advance front method (OAFM), for ellipse packing is proposed. The OAFM allows particle rotation at several angles and movement along a local advance front. Combined with the ellipse approximated by four connected arcs and a series of sequential coordinate transformations, the OAFM generates dense ellipse packing with any imposed size, aspect ratio, and orientation
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Coupling of SPH and Voronoi-cell lattice models for simulating fluid–structure interaction Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-09 Young Kwang Hwang, John E. Bolander, Yun Mook Lim, Jung-Wuk Hong
In this study, a new methodology for coupling smoothed particle hydrodynamics (SPH) and the Voronoi-cell lattice model (VCLM) is proposed for simulating fluid–structure interaction (FSI). Free-surface flow of the fluid is modeled using SPH; the structural components are modeled by the VCLM, which accounts for both geometric and material nonlinear behaviors. The FSI algorithm is effective regardless
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An improved material point method using moving least square shape functions Comp. Part. Mech. (IF 1.696) Pub Date : 2020-11-02 Jae-Uk Song, Hyun-Gyu Kim
In this study, moving least square (MLS) shape functions are employed to reduce the cell-crossing error occurred in conventional material point method (MPM) when material particles pass through grid cell boundaries. The level of smoothness of MLS shape functions for mapping information from material particles to a background grid can be controlled by the support size of MLS weight functions. A simple
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A fully coupled particle method for dynamic analysis of saturated soil Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-30 J. L. Mroginski, H. G. Castro, J. M. Podestá, P. A. Beneyto, A. R. Anonis
Among other numerical issues, it is well known that the finite element method (FEM) lacks objectivity in reproducing high deformation rates due to extreme external actions. In geotechnical applications, the coupling of large solid deformations with the pore fluid flow is a critical subject, being one of the multiple scenarios where FEM could have restricted applications. In order to overcome the aforementioned
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Full-scale simulation and validation of bucket filling for a mining rope shovel by using a combined rigid FE-DEM granular material model Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-30 Andreas Svanberg, Simon Larsson, Rikard Mäki, Pär Jonsén
Rope shovels and other heavy mining equipment used for loading fragmented rocks to extract minerals from the earth are used in almost every open pit mine. The optimization of the loading process is of enormous value due to the extremely large amount of material turn over. In this work, a full-scale numerical model of the loading process is developed. Granular material of copper ore is modeled in a
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Stabilized generalized interpolation material point method for coupled hydro-mechanical problems Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-17 Xiaoqin Lei, Siming He, Lizhou Wu
The material point method (MPM) has been increasingly used to simulate coupled hydro-mechanical problems involving large deformations. However, when addressing saturated porous media with an almost incompressible liquid phase, the classic explicit MPM with low-order interpolation functions is not stable if no further stabilization approach is used. In this study, a solid-velocity–liquid-velocity-based
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Karamelo: an open source parallel C++ package for the material point method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-14 Alban de Vaucorbeil, Vinh Phu Nguyen, Chi Nguyen-Thanh
A simple and robust C++ code for the material point method (MPM) called Karamelo is presented here. It was designed to provide an open source, fast, light and easy-to-modify framework for both conducting research on the MPM and research using the MPM, instead of a finite element package. This paper presents the overall philosophy, the main design choices and some of the original algorithms implemented
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SPH modelling of hydrodynamic lubrication: laminar fluid flow–structure interaction with no-slip conditions for slider bearings Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-09 Marco Paggi, Andrea Amicarelli, Pietro Lenarda
The FOSS CFD-SPH code SPHERA v.9.0.0 (RSE SpA) is improved to deal with “fluid–solid body” interactions under no-slip conditions and laminar regimes for the simulation of hydrodynamic lubrication. The code is herein validated in relation to a uniform slider bearing (i.e. for a constant lubricant film depth) and a linear slider bearing (i.e. for a film depth with a linear profile variation along the
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Collapse simulation of masonry arches induced by spreading supports with the combined finite–discrete element method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-10-09 Xudong Chen, Hongfan Wang, Andrew H. C. Chan, Anil K. Agrawal, Yingyao Cheng
Masonry arches are usually composed of individual blocks or voussoirs, which are highly discontinuous and nonlinear, and it is extremely difficult or even impossible to simulate their collapse behavior using finite element methods. Therefore, a combined finite–discrete element method (FDEM) is employed to simulate the collapse behavior of dry-joint masonry arches induced by spreading supports. With
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DEM simulations of polydisperse media: efficient contact detection applied to investigate the quasi-static limit Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-21 Tom Shire, Kevin J. Hanley, Kevin Stratford
Discrete element modeling (DEM) of polydisperse granular materials is significantly more computationally expensive than modeling of monodisperse materials as a larger number of particles are required to obtain a representative elementary volume, and standard contact detection algorithms become progressively less efficient with polydispersity. This paper presents modified contact detection and inter-processor
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Grand challenges for Smoothed Particle Hydrodynamics numerical schemes Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-19 Renato Vacondio, Corrado Altomare, Matthieu De Leffe, Xiangyu Hu, David Le Touzé, Steven Lind, Jean-Christophe Marongiu, Salvatore Marrone, Benedict D. Rogers, Antonio Souto-Iglesias
This paper presents a brief review of grand challenges of Smoothed Particle Hydrodynamics (SPH) method. As a meshless method, SPH can simulate a large range of applications from astrophysics to free-surface flows, to complex mixing problems in industry and has had notable successes. As a young computational method, the SPH method still requires development to address important elements which prevent
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Discrete element modeling of cantilever beams subjected to geometric nonlinearity and particle–structure interaction Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-16 Prasenjit Ghosh, G. K. Ananthasuresh
The discrete element method (DEM) is a general discrete modeling technique traditionally used to model granular material and discontinuous phenomena such as fracture and fragmentation of solids. We investigate the efficacy of DEM to model deformable elastic continua, cantilever beams in particular, and describe their mechanical behavior under loading. Of distinct interest is the ability of DEM to capture
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Toward a design methodology for particle dampers by analyzing their energy dissipation Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-15 Niklas Meyer, Robert Seifried
Particle dampers show a huge potential to reduce undesired vibrations in technical applications even under harsh environmental conditions. However, their energy dissipation depends on many effects on the micro- and macroscopic scale, which are not fully understood yet. This paper aims toward the development of design rules for particle dampers by looking at both scales. This shall shorten the design
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Particle-scale numerical modeling of thermo-mechanical phenomena for additive manufacturing using the material point method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-15 Takashi Maeshima, Youngkyu Kim, Tarek I. Zohdi
A fundamental numerical model at the powder particle scale based on the material point method (MPM) is developed for selective laser sintering (SLS). In order to describe the thermo-mechanical phenomena, a laser heat source model with a Gaussian energy distribution and the Perzyna viscoplastic model with a return mapping algorithm are employed. The principal process conditions, such as the laser power
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On the convergence of the generalized finite difference method for solving a chemotaxis system with no chemical diffusion Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-14 J. J. Benito, A. García, L. Gavete, M. Negreanu, F. Ureña, A. M. Vargas
This paper focuses on the numerical analysis of a discrete version of a nonlinear reaction–diffusion system consisting of an ordinary equation coupled to a quasilinear parabolic PDE with a chemotactic term. The parabolic equation of the system describes the behavior of a biological species, while the ordinary equation defines the concentration of a chemical substance. The system also includes a logistic-like
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Wall to particle bed contact conduction heat transfer in a rotary drum using DEM Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-12 Manogna Adepu, Shaohua Chen, Yang Jiao, Aytekin Gel, Heather Emady
Contact conduction heat transfer behavior in a rotary drum using the discrete element method (DEM)-based simulation codes MFIX-DEM (open-source) and EDEM (commercial) is investigated. Simulations are performed to compare the performance of open-source and commercial code models with experimental data. This study also aims to investigate the effects of particle size distribution (PSD), rotation speed
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Erosion dynamics of wet particle agglomerates Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-11 Thanh-Trung Vo
We study the erosion dynamics of wet particle agglomerates inside a simple shear flow of noncohesive granular materials by relying on the three-dimensional discrete-element simulations. The simulation model is discretized by assembling of wet and dry spherical particles. By systematically varying different parameters related to the shear flow of dry particles (the shear rate), the wet agglomerates
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Multiscale modeling of continuous crushing of granular media: the role of grain microstructure Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-08 Fan Zhu, Jidong Zhao
Natural granular materials such as sands often possess complex microstructural features including cleavage and minerals interfaces. Those features bring apparent mechanical anisotropy to particles and are known to have pronounced influence on particle crushing characteristics. This paper presents a multiscale simulation of continuous crushing of granular sand under one-dimensional compression in consideration
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Breakage behavior of biomass pellets: an experimental and numerical study Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-06 Hamid Gilvari, Wiebren de Jong, Dingena L. Schott
The presence and generation of fines and dust in the bulk of biomass pellets have inflicted several problems in the supply chain during transportation and storage, and the breakage behavior of pellets has been scarcely studied so far. Fines and dust are the consequences of impact and abrasive forces through the whole supply chain; however, the breakage happens at the particle level. Therefore, to study
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A meshfree generalized finite difference method for solution mining processes Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-05 Isabel Michel, Tobias Seifarth, Jörg Kuhnert, Pratik Suchde
Experimental and field investigations for solution mining processes have improved intensely in recent years. Due to today’s computing capacities, three-dimensional simulations of potential salt solution caverns can further enhance the understanding of these processes. They serve as a “virtual prototype” of a projected site and support planning in reasonable time. In this contribution, we present a
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Simulation of air invasion in immersed granular beds with an unresolved FEM–DEM model Comp. Part. Mech. (IF 1.696) Pub Date : 2020-09-02 M. Constant, N. Coppin, F. Dubois, V. Vidal, V. Legat, J. Lambrechts
This paper is devoted to an unresolved model for the simulation of air invasion in immersed granular flows without interface reconstruction between the liquid and the gas. Experiments of air invading a granular bed immersed in ethanol were achieved in a Hele-Shaw cell to observe the gas invasion paths and to calibrate the numerical multiscale model. The grains movements are computed at a fine scale
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Adaptive particle method based on moments for simulating the mass transport in natural flows Comp. Part. Mech. (IF 1.696) Pub Date : 2020-08-13 Adrien Berchet Berchet, Anthony Beaudoin, Serge Huberson Huberson
In this work, two modifications of an adaptive particle method based on the moments of the internal concentration of numerical particles are presented to introduce the effect of local shears on the mass transport in natural flows. This moment method uses a Taylor expansion of the flow velocity field to derive the transport equation of moments. The first modification is based on the introduction of
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HOSS: an implementation of the combined finite-discrete element method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-07-31 Earl E. Knight, Esteban Rougier, Zhou Lei, Bryan Euser, Viet Chau, Samuel H. Boyce, Ke Gao, Kurama Okubo, Marouchka Froment
Nearly thirty years since its inception, the combined finite-discrete element method (FDEM) has made remarkable strides in becoming a mainstream analysis tool within the field of Computational Mechanics. FDEM was developed to effectively “bridge the gap” between two disparate Computational Mechanics approaches known as the finite and discrete element methods. At Los Alamos National Laboratory (LANL)
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Explicit incompressible smoothed particle hydrodynamics in a multi-GPU environment for large-scale simulations Comp. Part. Mech. (IF 1.696) Pub Date : 2020-07-26 Daniel Morikawa, Harini Senadheera, Mitsuteru Asai
We present an explicit incompressible smoothed particle hydrodynamics formulation with stabilized pressure distribution and its implementation in a multiple graphics processing unit environment. The pressure Poisson equation is stabilized via both pressure invariance and divergence-free conditions, and its explicit formulation is derived using the first step of the Jacobi iterative solver. Also, we
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Linearization-based methods for the calibration of bonded-particle models Comp. Part. Mech. (IF 1.696) Pub Date : 2020-07-25 Kolja Jarolin, Maksym Dosta
In the work at hand, two methods for the calibration of the elastic material parameters of bonded-particle models (BPMs) are proposed. These methods are based on concepts of classical mechanics and enable a faster calibration compared to the conventional trial and error strategy. Moreover, they can be used to counter-check the consistency of the BPM. In the first method, the mathematical model is linearized
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Discrete element method using cohesive plastic beam for modeling elasto-plastic deformation of ductile materials Comp. Part. Mech. (IF 1.696) Pub Date : 2020-07-11 Vinh D. X. Nguyen, A. Kiet Tieu, Damien André, Lihong Su, Hongtao Zhu
This paper introduces a three-dimensional (3D) simulation to model the elasto-plastic deformation of ductile materials by discrete element method (DEM) using cohesive plastic beam approach. The Euler–Bernoulli beam theory is applied to calculate force and torque reactions of the cohesive beam bond that can account for plastic strain. In order to simulate the elasto-plastic behavior of materials, a
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Lagrangian finite element method with nodal integration for fluid–solid interaction Comp. Part. Mech. (IF 1.696) Pub Date : 2020-07-10 Alessandro Franci
This work presents a fully Lagrangian Finite Element Method (FEM) with nodal integration for the simulation of fluid–structure interaction (FSI) problems. The Particle Finite Element Method (PFEM) is used to solve the incompressible fluids and to track their evolving free surface, while the solid bodies are modeled with the standard FEM. The coupled problem is solved through a monolithic approach to
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Accelerated simulations of direct shear tests by physics engine Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-29 Hantao He, Junxing Zheng, Zhaochao Li
Physics engines, originally developed to simulate physical and mechanical processes in modern video games, are increasingly used as a scientific computational platform in many disciplines due to their high computational efficiency. This study explores the feasibility of using an open-source physics engine, Project Chrono, to simulate direct shear tests. This study develops a series of pre-processing
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Distribution function correction-based immersed boundary lattice Boltzmann method for thermal particle flows Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-26 Shi Tao, Qing He, Baiman Chen, Frank G. F. Qin
A novel immersed boundary lattice Boltzmann method (IB-LBM) is proposed to simulate the complex thermal particle flows. In the present scheme, the boundary condition is directly implemented by correcting the distribution function at the neighboring points around the interface, similar to the original LBM. Furthermore, an adjustment parameter is introduced for ensuring the accuracy in the boundary treatment
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A novel framework for elastoplastic behaviour of anisotropic solids Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-25 Zhou Lei, Christopher R. Bradley, Antonio Munjiza, Esteban Rougier, Bryan Euser
A general framework for developing nonlinear hyperelastic/plastic constitutive laws for anisotropic solids experiencing large strains and strain rates has been developed. The proposed framework does not rely on the “a priori” known strain energy function, but instead introduces a physical decomposition of the material element into seven physically independent stress bearing mechanisms, each of which
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Numerical modeling of the tension stiffening in reinforced concrete members via discontinuum models Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-21 Bora Pulatsu, Ece Erdogmus, Paulo B. Lourenço, José V. Lemos, Kagan Tuncay
This study presents a numerical investigation on the fracture mechanism of tension stiffening phenomenon in reinforced concrete members. A novel approach using the discrete element method (DEM) is proposed, where three-dimensional randomly generated distinct polyhedral blocks are used, representing concrete and one-dimensional truss elements are utilized, representing steel reinforcements. Thus, an
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The study on performances of kernel types in solid dynamic problems by smoothed particle hydrodynamics Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-16 Meng Shuangshuang, Hassan Frissane, Lorenzo Taddei, Nadhir Lebaal, Sebastien Roth
As the earliest meshless method, smoothed particle hydrodynamics (SPH) has been applied in solid dynamics because of its great potentials in simulating extremely large deformations. In terms of the essence of SPH, it uses a kernel function for numerical approximations. Some studies demonstrate mathematically that the types of the kernel function directly influence the stability and overall accuracy
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A curing model for the numerical simulation within additive manufacturing of soft polymers using peridynamics Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-11 Philipp Hartmann, Christian Weißenfels, Peter Wriggers
Within this paper, the modelling and simulation of extrusion-based Additive Manufacturing (AM) processes of curing polymers is presented. The challenge of the AM is the adjustment of processing parameters. This includes the application of laser radiation to locally accelerate the curing in order to control the final geometry of the implant. Since complex multi-physical coupling effects are hardly predictable
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Simulation of mixed-mode fracture using the combined finite–discrete element method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-06 S. Boyce, Z. Lei, B. Euser, E. E. Knight, E. Rougier, J. C. Stormont, M. M. Reda Taha
It has been shown experimentally that under mixed tensile and compressive stress states, a corresponding mixed-mode fracture will occur. In this paper, the formation of mixed-mode fractures is investigated using the combined finite–discrete element method. A series of simulations with confining pressures ranging from 7.5 to 150 MPa generate a spectrum of mixed-mode failure conditions. These stress
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A coupled FEM–DEM method for the modeling of fluids laden with particles Comp. Part. Mech. (IF 1.696) Pub Date : 2020-06-02 Ana C. S. Fernandes, Henrique C. Gomes, Eduardo M. B. Campello, André S. Müller, Paulo M. Pimenta
This work presents a computational method for the solution of problems involving flowing fluid media laden with solid particles. The idea is based on previous works by the authors on (though then separately considered) fluid–structure interaction and particle dynamics. The fluid problem is treated through an Eulerian finite element approach, with the resulting system of nonlinear equations being iteratively
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Distributed intelligence and the equivalence of matter and information Comp. Part. Mech. (IF 1.696) Pub Date : 2020-05-27 Esteban Rougier, Antonio Munjiza, Jasna Munjiza
In this paper, it is argued that science of discontinua represents a major paradigm shift in how scientific research is done. First, a historical perspective is given, followed by key aspects of discontinuum simulations and its potential in aiding research and development. This is followed by a philosophical perspective on equivalence of matter and information as inspired by Aristotle’s quest for souls
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Modeling earthquakes with off-fault damage using the combined finite-discrete element method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-05-11 Kurama Okubo, Esteban Rougier, Zhou Lei, Harsha S. Bhat
When a dynamic earthquake rupture propagates on a fault in the Earth’s crust, the medium around the fault is dynamically damaged due to stress concentrations around the rupture tip. Recent field observations, laboratory experiments and canonical numerical models show the coseismic off-fault damage is essential to describe the coseismic off-fault deformation, rupture dynamics, radiation and overall
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On the truncated integral SPH solution of the hydrostatic problem Comp. Part. Mech. (IF 1.696) Pub Date : 2020-05-06 F. Macià, P. E. Merino-Alonso, A. Souto-Iglesias
Uniqueness of solutions to the SPH integral formulation of the hydrostatic problem, and the convergence of such solution to the exact linear pressure field, are theoretically demonstrated in this paper using Fourier analytical techniques. This problem involves the truncation of the kernel when the Dirichlet boundary condition (BC) on the pressure is imposed at the free surface. Certain hypotheses are
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Combining peridynamics and generalized interpolation material point method via volume modification for simulating transient responses Comp. Part. Mech. (IF 1.696) Pub Date : 2020-04-24 Zhixin Zeng, Yu-Chen Su, Xiong Zhang, Zhen Chen
By using nonlocal discrete force functions, peridynamics (PD) can effectively deal with the problems involving discontinuities and singularities. As a continuum-based particle method, the material point method (MPM) and its advanced version, generalized interpolation material point method (GIMP), use local and nonlocal spatial discretization, respectively, to effectively simulate large deformations
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Correction to: An efficient and stabilised SPH method for large strain metal plastic deformations Comp. Part. Mech. (IF 1.696) Pub Date : 2019-11-09 Giorgio Greto, Sivakumar Kulasegaram
The symbol was introduced incorrectly inside the “Time-stepping the solution” box, directly under the “Compute first Piola–Kirchhoff stress tensor Pi” as in “Appendix A” listing.
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Penetration of annular and general jets into underwater plates Comp. Part. Mech. (IF 1.696) Pub Date : 2020-04-08 Zhifan Zhang, Cheng Wang, Wenlong Xu, Haoliang Hu
Underwater structures can be seriously damaged by a metal jet associated with underwater explosion. Three main modes—Shaped Charge Jet, Jetting Projectile Charge and Explosive Formed Projectile—are included for traditional metal jets. Compared with the traditional ones, an annular jet may cause more serious damage into a target. Hence, a comparison for the entire process of annular and general jets
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Breaking characteristics of ice cover and dynamic ice load on upward–downward conical structure based on DEM simulations Comp. Part. Mech. (IF 1.696) Pub Date : 2020-04-04 Xue Long, Shewen Liu, Shunying Ji
In ice-covered regions, the upward–downward ice-breaking cones are applied widely to reduce the ice load on the vertical jacket offshore platforms. The ice load is affected by the diameter of cone at the water level. In particular, the sea ice can impact on the vertical portion of the platform which is beyond the covered area of the upward–downward cone under the extreme low or high water level. In
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Discharge characteristics of binary particles in a rectangular hopper with inclined bottom Comp. Part. Mech. (IF 1.696) Pub Date : 2020-04-01 Zhongliang Zhang, Yongqi Liu, Bin Zheng, Ruiyang Li, Peng Sun
The stable discharge of particles through the hopper plays a key role in many industrial applications. In order to investigate the discharge characteristics of binary particles in a rectangular hopper with an inclined bottom, the discrete element method (DEM) was used to simulate the discharge process. The accuracy of DEM was validated by comparing calculated and experimental values. The influences
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Extension of B-spline Material Point Method for unstructured triangular grids using Powell–Sabin splines Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-26 Pascal de Koster, Roel Tielen, Elizaveta Wobbes, Matthias Möller
The Material Point Method (MPM) is a numerical technique that combines a fixed Eulerian background grid and Lagrangian point masses to simulate materials which undergo large deformations. Within the original MPM, discontinuous gradients of the piecewise-linear basis functions lead to the so-called grid-crossing errors when particles cross element boundaries. Previous research has shown that B-spline
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An algorithm for generating mechanically sound sphere packings in geological models Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-21 François Bonneau, Luc Scholtès, Hugo Rambure
The discrete element method (DEM) is a powerful tool for simulating complex mechanical behaviors which discretizes the targeted medium with particles. The properties of particle assemblies used in DEM simulations directly impact the behavior of the simulated medium. It is thus of critical importance to generate particle assemblies so as to (1) avoid any bias induced by their fabric and (2) conform
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A discrete element study of the effect of particle shape on packing density of fine and cohesive powders Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-13 H. S. Elmsahli, I. C. Sinka
Fine and cohesive powders typically exhibit low packing density, with solid volume fraction around 0.3. Discrete element modelling (DEM) of particulate materials and processes typically employs spherical particles which have much larger solid fractions (e.g. 0.64 for dense random packing of frictionless spheres). In this work a range of quasi-spherical particles are designed, represented by a number
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Fracture shearing of polycrystalline material simulations using the material point method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-12 Samuel J. Raymond, Bruce D. Jones, John R. Williams
In this work, we present a newly developed workflow to study the combined effect of shear and normal stresses upon a preexisting fracture plane. This workflow is used to study the behavior of both single grain and polycrystalline materials, with varying material properties. The surface roughness and aperture of preexisting fractures are highly dependent upon the dynamic stress behavior within rock
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A smooth contact algorithm for the combined finite discrete element method Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-12 Zhou Lei, Esteban Rougier, Bryan Euser, Antonio Munjiza
From its inception, the combined finite discrete element method has used a distributed potential contact force algorithm to resolve interaction between finite elements. The contact interaction algorithm relies on evaluation of the contact force potential field. The problem with existing algorithms is that the potential field introduces artificial numerical non-smoothness in the contact force. This
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Realistic soil particle generation based on limited morphological information by probability-based spherical harmonics Comp. Part. Mech. (IF 1.696) Pub Date : 2020-03-10 Quan Sun, Junxing Zheng
Three-dimensional imaging techniques, such as X-ray computed tomography, have been used to scan realistic particle geometries. However, these techniques are labor intensive, time-consuming, and costly to obtain a large number of particles. Therefore, it is desirable if computers can be taught to generate realistic particles based on given morphological properties. This paper develops a particle generation
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