5,142 Hits in 9.9 sec

Return mapping for nonsmooth and multiscale elastoplasticity

Xuxin Tu, José E. Andrade, Qiushi Chen
2009 Computer Methods in Applied Mechanics and Engineering  
This feature affords the method the ability to integrate nonsmooth ðC 0 Þ evolution laws that may not be integrable using implicit methods.  ...  We present a semi-implicit return mapping algorithm for integrating generic nonsmooth elastoplastic models.  ...  The DEM model used in the multiscale computation is a modification of Oval, an open source GNU software that was developed by Prof. Matthew R. Kuhn from the University of Portland.  ... 
doi:10.1016/j.cma.2009.02.014 fatcat:hueumt25ejcg5dxurokslmz4wq

Implement the particle finite element method in ABAQUS

Haichao Li, Sheng Zhang
2020 Japanese Geotechnical Society Special Publication  
We implement the particle finite element method (PFEM) in the general numerical simulation framework ABAQUS to investigate the quasi-static collapse of two-dimensional granular columns and landslides.  ...  As a recently proposed continuum approach, the PFEM inherits both the solid mathematical foundation of the particle of the traditional finite element method and the flexibility of particle methods in simulating  ...  The large granular systems normally are comprised of billions of particles, using the discrete element method (DEM) (Cundall and Strack 1979) , to conduct related numerical simulation will be time-costing  ... 
doi:10.3208/jgssp.v08.c16 fatcat:cwzlq3saznbuvjfch7z62alv44

Comparative investigation of dynamic implicit and explicit methods for the Lattice Discrete Particle Model [chapter]

M. Pathirage, F. Thierry, D. Tong, G. Cusatis, D. Grégoire, G. Pijaudier-Cabot
2022 Computational Modelling of Concrete and Concrete Structures  
In this study, the performance of the Lattice Discrete Particle Model (LDPM), newly implemented in the implicit solver CAST3M was investigated.  ...  There are in general two classes of time integration algorithms for dynamics problems, namely implicit and explicit methods.  ...  Each tetrahedral element in LDPM is composed of 12 facets (equivalent of integration points in classical finite elements).  ... 
doi:10.1201/9781003316404-59 fatcat:56vjbzwyxbdd3mnpe3wskvuc7m

On the numerical modeling of granular material flows via the Particle Finite Element Method (PFEM)

C. Dávalos, J. Cante, J.A. Hernández, J. Oliver
2015 International Journal of Solids and Structures  
The gist of the employed modeling approach was already presented by the authors in a recent work [38] , but no proper description of the underlying numerical techniques was provided therein.  ...  The present paper focuses precisely on the detailed discussion of such numerical tech- Keywords Granular material; finite elements; Particle finite elements  ...  Acknowledgement The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement  ... 
doi:10.1016/j.ijsolstr.2015.06.013 fatcat:am2vmqtv45d2ldgy3o4z62tpoq

A semi-implicit material point method for the continuum simulation of granular materials

Gilles Daviet, Florence Bertails-Descoubes
2016 ACM Transactions on Graphics  
Thanks to a semi-implicit timestepping scheme and a careful spatial discretization of our rheology built upon the Material-Point Method, we are able to preserve at each time step the exact coupling between  ...  We validate our method by successfully capturing typical macroscopic features of some classical experiments, such as the discharge of a silo or the collapse of a granular column.  ...  Lagrée for his help in reviewing the literature on granular simulation, R. Narain for sharing his code, and anonymous reviewers for their insightful feedbacks.  ... 
doi:10.1145/2897824.2925877 fatcat:yy5hijeuzvfaplz7xj4r6dsamq

Multiscale framework for behavior prediction in granular media

José E. Andrade, Xuxin Tu
2009 Mechanics of materials (Print)  
In this work, a predictive multiscale framework for modeling the behavior of granular materials is presented.  ...  The high-quality predictions obtained using the multiscale method highlight its potential to unravel complex material behavior where hitherto phenomenological models have failed.  ...  The expert feedback from the  ... 
doi:10.1016/j.mechmat.2008.12.005 fatcat:czshknp6kvbg5bgek2nhh6ko2u

Multiscale modeling for bioresources and bioproducts

M. Barnabé, N. Blanc, T. Chabin, J.-Y. Delenne, A. Duri, X. Frank, V. Hugouvieux, E. Lutton, F. Mabille, S. Nezamabadi, N. Perrot, F. Radjai (+2 others)
2018 Innovative Food Science & Emerging Technologies  
Hugouvieux) 1 Authors are listed in alphabetical order. 1 properties and macroscopic behavior of soft-matter and granular systems, using numerical and experimental methods borrowed from physics and mechanics  ...  These predictive methods are illustrated in the context of cheese ripening, grape maturity prediction and bacterial production.  ...  Acknowledgement The authors thank the PhD students, postdocs, colleagues and collaborators who contributed to some of the results cited in the Reference section.  ... 
doi:10.1016/j.ifset.2017.09.015 fatcat:zic5po24fnbx5dds3yidkzhdxe

Preprocessing structured clinical data for predictive modeling and decision support

Mónica Oliveira, Filipe Janela, Henrique Martins, José Ferrão
2016 Applied Clinical Informatics  
Methods Along standard data processing stages – extracting database entries, defining features, processing data, assessing feature values and integrating data elements, within an EDPAI framework –, we  ...  It may advise researchers on potential pitfalls and implications of methodological decisions in handling structured data, so as to avoid biases and help realize the benefits of the secondary use of EHR  ...  The authors thank the thorough and insightful comments from anonymous referees on an earlier version of this paper. The authors remain responsible for any omissions and inaccuracies in this article.  ... 
doi:10.4338/aci-2016-03-soa-0035 pmid:27924347 pmcid:PMC5228148 fatcat:yrnjgprzgrbfxbye6yxxrlisw4

Tools for performance simulation of heat, air and moisture conditions of whole buildings

Monika Woloszyn, Carsten Rode
2008 Building Simulation  
The purpose of a recent international collaborative project, IEA ECBCS Annex 41, has been to advance development in modelling the integral heat, air and moisture transfer processes that take place in "  ...  This paper will illustrate some of the modelling work that has taken place within the project and present some of the simulation tools used.  ...  The collaboration with and contributions from all colleagues is greatly acknowledged.  ... 
doi:10.1007/s12273-008-8106-z fatcat:wrnpil7khnbzvewm7gm3kaolvy

Granular element method for three-dimensional discrete element calculations

Keng-Wit Lim, José E. Andrade
2013 International journal for numerical and analytical methods in geomechanics (Print)  
This paper endows the recently-proposed granular element method (GEM) with the ability to perform 3D discrete element calculations.  ...  Furthermore, the applicability of GEM is enhanced by its tight integration with existing non-uniform rational B-Splines modeling tools and ability to provide a seamless transition from binary images of  ...  ACKNOWLEDGEMENTS This work is partially supported by the NSF CAREER Grant No. 1060087 and the AFOSR YIP Grant No. FA9550-11-1-0052 of the California Institute of Technology.  ... 
doi:10.1002/nag.2203 fatcat:nggvrk2tuvc7tmxkjtmclmv6kq

Particle-Based Approach for Simulation of Nonlinear Material Behavior in Contact Zones [chapter]

Evgeny V. Shilko, Alexey Yu. Smolin, Andrey V. Dimaki, Galina M. Eremina
2020 Springer Tracts in Mechanical Engineering  
This chapter is devoted to a brief review of recent advances in the development of the popular particle-based discrete element method (DEM).  ...  The most important achievement of this group is a generalized formulation of the method of homogeneously deformable discrete elements.  ...  Acknowledgements The work was performed according to the Government research assignment for ISPMS SB RAS.  ... 
doi:10.1007/978-3-030-60124-9_4 fatcat:bagk2a5725f3xinor7alvbxjs4

Granular element method for computational particle mechanics

José E. Andrade, Keng-Wit Lim, Carlos F. Avila, Ivan Vlahinić
2012 Computer Methods in Applied Mechanics and Engineering  
The new method, called GEM, bypasses one of the current bottlenecks in computational discrete mechanics of granular materials by allowing discrete elements to take realistic and complex granular shapes  ...  This paper presents a method within the family of the Discrete Element Method (DEM) capable of accurately capturing grain shape by using Non-Uniform Rational Basis-Splines (NURBS).  ...  In light of these advances in characterization of granular materials, and the tremendous increase in computational power, we propose a new paradigm for discrete element methods based on Non-Uniform Rational  ... 
doi:10.1016/j.cma.2012.06.012 fatcat:ekqerpmtivgjditafmcaf3ymsq

From mitochondrial ion channels to arrhythmias in the heart: computational techniques to bridge the spatio-temporal scales

G. Plank, L. Zhou, J. L Greenstein, S. Cortassa, R. L Winslow, B. O'Rourke, N. A Trayanova
2008 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
The goals of this article are (i) to review the techniques that are currently employed to model cardiac electrical activity in the heart, discussing the strengths and weaknesses of the various approaches  ...  Achieving sufficient computational efficiency is the key to success in the quest to develop multiscale realistic models that are expected to lead to better understanding of the mechanisms of arrhythmia  ...  This work was supported by Marie Curie Fellowship MC-OIF 040190 funded by the European Commission and SFB grant F3210-N18 from the Austrian Science Fund (FWF) to G.P.; NIH grants R37-HL54598, R33-HL87345  ... 
doi:10.1098/rsta.2008.0112 pmid:18603526 pmcid:PMC2778066 fatcat:fr72o7csbzh6vnf73u2fgrll4i

A finite element implementation of the nonlocal granular rheology

David L. Henann, Ken Kamrin
2016 International Journal for Numerical Methods in Engineering  
-the granular fluidity, which is a scalar state parameter describing the susceptibility of a granular element to flow.  ...  A FINITE-ELEMENT IMPLEMENTATION OF THE NONLOCAL GRANULAR RHEOLOGY † Our notational conventions follow those of Gurtin [28].  ...  Finally, the model is fully continuum, in contrast to hybrid discrete element/continuum methods [26] .  ... 
doi:10.1002/nme.5213 fatcat:qe6uv35mwjabdjrvpbylhk3u34

Numerical Dynamics of Granular Materials [chapter]

Jean Jacques Moreau
2002 Solid Mechanics and its Applications  
The principles of the method are sketched, in particular the way possible collisions or other nonsmooth features of the evolution are handled.  ...  Contact Dynamics is a numerical method, suitable for computing the dynamical motion of large collections of rigid bodies, with Coulomb friction taken into account in the event of contact.  ...  DEM, sometimes also read as Discrete Element Method). Numerical simulation may be conducted thanks to the methods referred to in the foregoing.  ... 
doi:10.1007/978-94-017-1154-8_1 fatcat:fx7ff4xzy5fojnqozfm2l5arde
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