WhoIsDoingWhat

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Contents

Who is doing what

Václav Šmilauer

About me

  • PhD student at CVUT Prague & UJF Grenoble

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

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 at the 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)

Annoying bugs/missing features

  • We need a dedicated research engineer to boost Yade development
  • The time gain with "parallel" option is still very small (wait! not sure of that)

Anton Gladkyy

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

Annoying bugs/missing features

  • LACK of documentation. Thanks to all who created articles, dedicated to YADE usage and development.
  • Good to have YADE deb-package in repositories.

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

  • PhD student at Grenoble INP

Field of interest

  • Mechanical behaviour of rock joints
  • Rock (in)stabilities

Working on

  • various loading Engines, in rock joints experiments framework (will be commited normally)
  • contact law, including momentum transfert

Annoying bugs/missing features

  • Documentation, as everyone : to explain which part of Yade does what, to make difference betwenne which one is old and doesn't work anymore (like former contact laws who cared only on "persistentInteractions", or old Colliders...) compared to which one is up-to date...
  • Linked whith that : the rythm of updates, without that other users can understand if they procur major advantages or typo corrections
  • I would see, as Luc Sibille, interest in splitting .xml files

Luc Scholtès

About me

  • Post-doctoral fellow at the Nantes University

Field of interest

  • DEM and Fluid couplings (capillary effects and internal flows)
  • micro-mechanics and homogenization in granular materials (multi-scale approach)

Working on

  • Triaxial testing
  • Contact laws (CapillaryCohesiveLaw, HydrodynamicLaw,...)
  • Coupling YADE with LBM
  • Texture effects on macroscopical behaviour

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;

Your Name (template: copy&paste, do not delete)

About me

Field of interest

Working on

Annoying bugs/missing features