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A discrete element method (DEM), also called a distinct element method, is any of a family of numerical methods for computing the motion and effect of a large number of small particles. Though DEM is very closely related to molecular dynamics, the method is generally distinguished by its inclusion of rotational degrees-of-freedom as well as stateful contact and often complicated geometries (including polyhedra). With advances in computing power and numerical algorithms for nearest neighbor sorting, it has become possible to numerically simulate millions of particles on a single processor. Today DEM is becoming widely accepted as an effective method of addressing engineering problems in granular and discontinuous materials, especially in granular flows, powder mechanics, and rock mechanics.

Attributes	Values
rdf:type	Thing
rdfs:label	Discrete element method (en)
rdfs:comment	A discrete element method (DEM), also called a distinct element method, is any of a family of numerical methods for computing the motion and effect of a large number of small particles. Though DEM is very closely related to molecular dynamics, the method is generally distinguished by its inclusion of rotational degrees-of-freedom as well as stateful contact and often complicated geometries (including polyhedra). With advances in computing power and numerical algorithms for nearest neighbor sorting, it has become possible to numerically simulate millions of particles on a single processor. Today DEM is becoming widely accepted as an effective method of addressing engineering problems in granular and discontinuous materials, especially in granular flows, powder mechanics, and rock mechanics. (en)
differentFrom	Finite element method
sameAs	Discrete element method Discrete element method
dbp:wikiPageUsesTemplate	dbt:Cite_book dbt:Cite_encyclopedia dbt:Cite_journal dbt:Distinguish dbt:Harv dbt:Harvtxt dbt:More_citations_needed dbt:Reflist dbt:Short_description
Subject	Numerical differential equations
thumbnail	wiki-commons:Special:FilePath/Cundall_DEM.gif?width=300
foaf:depiction
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Discrete_element_method?oldid=1072183499&ns=0
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Wikipage revision ID	1072183499 (xsd:integer)
Link from a Wikipage to another Wikipage	Fluid Numerical analysis Numerical methods for ordinary differential equations Verlet integration Adhesion Barnes–Hut simulation Boundary value problem Friction Numerical differential equations Discontinuous deformation analysis Meshfree methods Octree Peter A. Cundall Powder metallurgy Quadratic growth Quadtree Chemical reaction Plasticity (physics) Cohesion (chemistry) Compaction simulation Computational fluid dynamics Continuum mechanics Control flow Coulomb's law Elasticity (physics) Homogenization (chemistry) Movable cellular automaton Newton's laws of motion Soil mechanics Solid Electric charge Electrostatics Finite element method Galaxy Gravity Symplectic integrator Extended discrete element method Fast multipole method Heat transfer Molecular dynamics Pauli exclusion principle London dispersion force Velocity Leapfrog integration dbr:Ante_Munjiza dbr:Antonio_Bobet dbr:Contact_plasticity dbr:Distinct_element_method dbr:Generalized_discrete_element_method dbr:Liquid_bridging dbr:Nenad_Bicanic dbr:Roger_Owen_(mathematician)
has abstract	A discrete element method (DEM), also called a distinct element method, is any of a family of numerical methods for computing the motion and effect of a large number of small particles. Though DEM is very closely related to molecular dynamics, the method is generally distinguished by its inclusion of rotational degrees-of-freedom as well as stateful contact and often complicated geometries (including polyhedra). With advances in computing power and numerical algorithms for nearest neighbor sorting, it has become possible to numerically simulate millions of particles on a single processor. Today DEM is becoming widely accepted as an effective method of addressing engineering problems in granular and discontinuous materials, especially in granular flows, powder mechanics, and rock mechanics. DEM has been extended into the Extended Discrete Element Method taking heat transfer, chemical reaction and coupling to CFD and FEM into account. Discrete element methods are relatively computationally intensive, which limits either the length of a simulation or the number of particles. Several DEM codes, as do molecular dynamics codes, take advantage of parallel processing capabilities (shared or distributed systems) to scale up the number of particles or length of the simulation. An alternative to treating all particles separately is to average the physics across many particles and thereby treat the material as a continuum. In the case of solid-like granular behavior as in soil mechanics, the continuum approach usually treats the material as elastic or elasto-plastic and models it with the finite element method or a mesh free method. In the case of liquid-like or gas-like granular flow, the continuum approach may treat the material as a fluid and use computational fluid dynamics. Drawbacks to homogenization of the granular scale physics, however, are well-documented and should be considered carefully before attempting to use a continuum approach. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Discrete_element_method
is rdfs:seeAlso of	Slope stability analysis
is Wikipage redirect of	Discrete Element Method Discrete particle method Discrete particle model
is Link from a Wikipage to another Wikipage of	Numerical modeling (geology) CFD-DEM CFD-DEM model Discontinuous deformation analysis Discrete Element Method Discrete calculus DEM (disambiguation) DPM List of mathematics-based methods List of numerical analysis topics List of people associated with Imperial College London Cohesion number Compaction simulation Computational fluid dynamics Movable cellular automaton Finite element method Index of physics articles (D) Extended discrete element method Extreme Loading for Structures

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