Video Prof. Wriggers - Particles 2011

Titulo: **On Different DEM-FEM Coupling Schemes in Engineering Applications**

Conferenciante **Prof. P. Wriggers**

Area Tematica: **Computational material failure and fracture**

Fecha, lugar y evento: **26/10/2011**, **Barcelona, II International Conference on particle-based Methods Fundamentals and Applications PARTICLES 2011**

Resumen:* *

*Many of the raw materials handled in chemical industries appear in granulated or particulate form. Ideally, in an attempt to reduce laboratory expenses, one would like to make predictions of a complex granular flow's behavior by numerical simulations, with the primary goal being to minimize timeconsuming trial and error experiments. Often the particles are submerged in fluids or they contact solids. Thus coupling of the discrete element method, describing the particles, and the finite element method, describing solid deformations or fluid flow, has to be considered. For this different methods are available that depend upon the application. Discrete elements and solids can be coupled via surfaces when contact problems are present. This surface coupling may lead to two different formulations. These are related to particles submerged in solids or solids submerged in particles. Applications of such coupling are non-cohesive frictional granular materials that can localize or are penetrated in a pile driving process. Here the problem domain is split into a domain of small, rather homogeneous deformation that will be modeled as continuum using the Finite Element Method (FEM) and a domain of large, eventually discontinuous deformation modeled by a three-dimensional Discrete Element Method (DEM). Another coupling is related to particle-fluid flow systems. These are of great practical importance in the production processes of chemical and food industries as well as in geological engineering problems related to fluvial erosion, fluidized beds and sedimentation. Such problems generally require an accurate characterization and a highly resolved model of the fluid-particle flow at multiple temporal and spatial scales. In particular, in order to account for the microscale particle-fluid and particle-particle interactions within the coupled twophase flow system, the numerical resolution should be of the order of a representative particle dimension. Here, an efficient fictitious boundary method is applied for the simulation of three-dimensional large-scale particle-fluid flows. Several examples show the applicability of the methods to real size engineering problems *

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