WhoIsDoingWhat

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Contents

Who is doing what

Václav Šmilauer

About me

  • Former PhD student at CVUT Prague & UJF Grenoble
  • Currently freelancer

Field of interest

  • Discrete concrete models for elastic, non-elastic (incl. damage) behavior & applications
  • Software engineering

Working on

  • CPM (Concrete Particle Model), in pkg/dem/ConcretePM.?pp; python scripting; performance; parallelization
  • Moved over to the WooDEM fork of Yade, as freelancer

Annoying bugs/missing features

  • Badly scalable collider -- for >50k particles, collider takes over 80% of simulation time! (there are O(n) algorithms (Munjiza's NBS, for instance) but not implemented in Yade. Do you have a master student to work on that? Quite nice topic for master's thesis.
  • Lack of documentation for many classes, lack of documentation for yade in general
  • Duplicated code, unfinished/dirty code, undocumented code, deprecated code. Shouldn't we do some review of all code for docs, functionality and hacks?

Vincent Richefeu

About me

  • Assistant Professor at the University Joseph Fourier

Field of interest

  • (until now) wet granular materials
  • micro-mechanics and physics
  • DEM (MD-like and CD approaches)
  • Force laws (called constitutive laws in yade)

Working on

  • Avanlanches
  • generation of sphere packings

Annoying bugs/missing features

  • I don't feel good with interaction parameters that are stored (embeded) in bodies
  • Lack of design documentation (although there are very usefull documents written by kindly people)

Bruno Chareyre

About me

  • Assistant Professor in Grenoble University (INPG)

Field of interest

  • DEM and DEM-fluid couplings (capillary effects and internal flows)
  • micro-mechanics and homogenization in granular materials
  • modelling of snow creep
  • multiscale approaches

Working on

  • Triaxial testing
  • Contact laws (CohesiveFrictional, VolumicLaw,...)
  • Solving flow equations efficiently in coupled problems
  • Usage of triangulation in Yade (contact detection, local strain, volumic law, fluid flow)

Anton Gladky

About me

  • Work on PHD in TU Bergakademie Freiberg
  • Mining Engineer (grad.2004, National Mining University, Ukraine)

Field of interest

  • DEM modeling of mining rocks, implementing it in YADE
  • Mining rocks behaviour in high pressure grinding machines

Working on

  • RockPM (Rock particle module)
  • Packing scripts

Emanuele Catalano

About me

  • PhD Student in Grenoble INP
  • Geotechnical Engineer (grad. 2009, Politecnico di Torino, Italy)

Field of interest

  • Discrete Element Modelling
  • Coupled fluid - solid problems

Working on

  • A flow solver engine to be implemented in YADE

Annoying bugs/missing features

  • LACK of documentation? Initiation of a 'Level 2' guide will come soon. I'll do my best.

Roger Arnold

About me

  • Graduate student in Environmental Engineering at Virginia Tech in Blacksburg, VA

Field of interest

  • River Mechanics
  • Water Quality

Working on

  • Incipient motion and transport of sediment in turbulent flow

Annoying bugs/missing features

  • Lack of documentation (has made it difficult for me to learn YADE with no prior DEM experience )
  • It would be nice to have more DEM-fluid coupling in YADE

Janek Kozicki

About me

  • Assistant Professor at the Gdańsk University of Technology

Field of interest

  • software engineering and C++ design
  • discrete modeling

Working on

  • Development_schedule, albeit so slowly you almost don't ever notice
  • Lattice model
  • Polyhedron collisions

Annoying bugs/missing features

  • there isn't a single person who gets paid for yade software development, we all have to do our "own research" having no time to improve the tool that everyone uses.
  • coding style and naming inconsitencies
  • not using boost serialization
  • not using boost units
  • our yade website is a mess, and there are many of them! This one, some other on wikidot (?) some leftovers on berlios, and something on launchpad. And maybe even few more.

Sergei Dorofeenko

About me

  • Cand. Sci. (Phys.-Math.)
  • Researcher at the Institute of Problems of Chemical Physics RAS, Chernogolovka, Russia

Field of interest

  • Simulation of multiphase flows with chemical reactions
  • Filtration Combustion
  • Discrete Element Modelling (MD-like)
  • Computational Fluid Dynamics

Working on

  • Coupling DEM (YADE) and CFD (OpenFOAM) for coupled granular-fluid flows.
  • Using triangulated surfaces to define the walls
  • Parallelization
  • Performance

Annoying bugs/missing features

  • Lack of documentation
  • Coding style and naming inconsitencies
  • Lack of regression tests
  • Need more performance
  • Removing particles from simulation?

Feng Chen

About me

Geotechnical Engineer at HNTB Federal, Baton Rouge, LA (http://fchen3.googlepages.com/home)

(Recently graduated from PhD program in Department of Civil and Environmental Engineering, University of Tennessee, Knoxville)

Field of interest

  • Fluid-Particle interaction using Tsuji's (1993) method
  • Seepage flow in granular material
  • Fluidized bed
  • Application of DEM in chomratography column

Working on

YADE-DEM and OpenFOAM coupling, and planning to release YADE-OpenFOAM coupled code in the near future with verified examples and documents.

Looking for a good application of DEM-CFD not only in the research field.

Annoying bugs/missing features

Steep learning curve, Linux platform made it difficult to get more people join in.

Dang Hoang Kien

About me

  • PhD student at McGill University

Field of interest

  • Coupling DEM&FEM with application in geomechanics

Working on

  • FEM package for YADE using explicit solver, currently includes tetaherdon (4, 9 nodes with 1,4 and 5 Gauss points), hexahedron (8 nodes, 20 nodes with 1 and 8 Gauss points). (done but only compatible with old version)
  • Collider and packing algorithms. (compatible with old version)
  • Coupling DEM&FEM using interface and bridging domain

Annoying bugs/missing features

  • Basic classes (and even not the basic classes) are often changed so other users may not want to update to the most-to-date version. It limits the advantage of the new version.

Luc Sibille

About me

  • Lecturer at the University of Nantes (France)

Field of interest

  • DEM and DEM-fluid coupling (internal flows)
  • physical models with analogic materials (e.g. Schneebeli cylinders)
  • failure in granular matter
  • internal erosion in soils

Working on

  • Triaxial testing
  • Implementation of LBM in Yade to solve fluid dynamic flows
  • Degradation/modification of the granular assembly at the grain or contact scale

Annoying bugs/missing features

  • We need a dedicated research engineer to boost Yade development
  • Definition of the simulation in one big xml file (even if there is Python), what about three files: a file to define the loading programme, a second file to define the geometry and a third file to define the interaction parameters.

Jérôme Duriez

About me

  • Researcher at IRSTEA institute, please see herein for more details

Luc Scholtès

About me

  • Post-doctoral fellow at CSIRO - Earth Science and Resource Engineering

Field of interest

  • Hydro-Mechanical Couplings (unsaturated and saturated flows)
  • Rock Mechanics
  • Micro-Mechanics and Homogenization in granular materials (multi-scale approach)

Working on

  • Triaxial Testing
  • Contact Laws (CapillaryCohesiveLaw, RockJointedLaw...)
  • Texture effects on macroscopical behaviour
  • Geometry Import (Discrete Fracture Network)

Annoying bugs/missing features

  • We need a dedicated research engineer to boost Yade development

Jingsong Chen

About me

PhD student in Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, USA

Field of interest

  • Hot Asphalt Mixture packing;
  • Asphalt Concrete cracking and strength;
  • Creep of Asphalt Mixture;
  • Pavement material experiment simulation (like APA, IDT)

Working on

Hot Asphalt Mixture packing simulation by using YADE, and planning to do some research on Asphalt Concrete cracking and strength;

Annoying bugs/missing features

  • Compatibility of different version;
  • Insufficient example and document;

TRAN Van Tieng

About me

  • PhD Student at the University of Grenoble (France)
  • Invited Student at CSIRO - Earth Science and Resource Engineering (Brisbane,Australia)

Field of interest

  • Discrete Element Modelling
  • DEM-fluid coupling (unsaturated and saturated materials)
  • Mechanical behaviour of Concrete

Working on

  • Triaxial Testing
  • Contact laws (Elastic-Hardening-Damage constitutive law with a non linear relationship between forces and displacements)
  • Modelling of the unsaturated and saturated concrete's behaviours under high confining pressure (up to GPa)

Annoying bugs/missing features

Chiara Modenese

About me

  • PhD Student in Engineering Science, University of Oxford, UK
  • Structural Engineer (2009, University of Padua, Italy)

Field of interest

  • Discrete Element Modelling
  • Contact Mechanics
  • Constitutive modelling of granular materials
  • Numerical modelling of lunar soil

Working on

  • Triaxial test numerical simulations
  • Contact laws (HertzMindlin, contact law in the presence of adhesion)

Viet Tran

About me

  • PhD Student in Geotechnical Engineering, McGill University, Canada

Field of interest

  • Discrete Element Modelling
  • Coupled Finite Element/Discrete Element Method
  • Numerical modelling of geotechnical problems

Working on

  • Interface between DEM and FEM
  • Coupled FEM/DEM in tunneling

Klaus Thoeni

About me

  • PostDoc at The University of Newcastle, Australia

Field of interest

  • Numerical methods (DEM, BEM, FEM)
  • Coupling of different methods
  • Rock fall analysis and rock mechanics
  • Tunnelling and underground constructions
  • Structural analysis

Working on

  • Implementation of a particle model for double-twisted rock fall nets (WirePM)
  • Interaction model between rock fall net and rock boulders

Annoying bugs/missing features

  • Undocumented code and deprecated code
  • To many yade related websites. Informations often do not coincide or are duplicated!
  • Mess of scripts in the trunk version! Many scripts do not run mainly because the code is updated at some stage but nobody updates the scripts.
  • Missing list with favourite features! Let me start...

Favourite features

  • Open source
  • Linux based
  • Integration of python
  • Great flexibility in adding your own contact law etc.
  • Easy pre- and post-processing

Christian Jakob

About me

  • PhD at TU Bergakademie Freiberg, Germany

Field of interest

  • Numerical investigation of soils with Discrete Element Method on microscale
  • Hydromechanical coupling methods (continuum-discrete, DEM-SPH, DEM-LBM)

Working on

  • Micromechanical investigation of sandy soil under increasing water level
  • Capillary effects in an unsaturated granular material
  • Triggermechanisms for liquefaction without external stimulation

Favourite features

  • Clumps within periodic space
  • Simulation Inspection

Jan Stránský

About me

  • PhD student at CTU, Prague, Czech Republic

Field of interest

  • Concrete modeling
  • Numerical modeling in general

Working on

  • Development and improvement of concrete model in Yade
  • DEM-FEM coupling

Favourite features

  • Python
  • Open source
  • Clumps
  • Interaction masks