Granular materials in a split-bottom ring shear cell geometry show wide shear bands under slow, quasi-static deformation. From discrete element simulations (DEM), several continuum fields like the deformation gradient and stress are computed and evaluated with the goal to formulate objective constitutive relations for the flow behavior. From a single simulation only, by applying timeand (local)...

A homogenization strategy for granular materials is presented and applied to a three-dimensional Discrete Element Method (DEM), that uses superellipsoids as particles. Macroscopic quantities are derived from the microscopic quantities resulting from a DEM simulation by averaging over representative volume elements (RVEs). The implementation of a RVE is described in detail regarding the definiti...

Using satellite cloud images to simulate clouds is one of the new visual simulation technologies in Virtual Reality (VR). Taking the original data of satellite cloud images as the source, this paper depicts specifically the technology of 3D satellite cloud imaging through the transforming of coordinates and projection, creating a DEM (Digital Elevation Model) of cloud imaging and 3D simulation....

The Distinct Element Method (DEM) is a numerical method for the simulation of the behaviour of media consisting of discrete particles, and is widely used for process optimization in the food and pharmaceutical industries. The DEM is very computationally expensive, but has properties that make it amenable to acceleration by reconfigurable computing. This paper presents the design of an implement...

The Discrete Element Method (DEM) is attracting increasing interest for the simulation of industrial granular flows. While the majority of previous DEM modelling has considered two-dimensional flows, we present here a series of three-dimensional simulations for a number of important industrial applications. The charge motion in a 5 m diameter ball mill and in a Hicom nutating mill, discharge fr...

A three-dimensional multi-scale discrete–continuum model (Finite Volume Method × Discrete Element Method, FVM DEM) is developed for a discrete-based description of the mechanical behavior granular soils in boundary value problems (BVPs). In such scheme, constitutive response material derived through direct DEM computations on representative volume element attached to each mesh element. The appr...

The rapid progress of lidar technology has made the acquirement and application of high-resolution digital elevation model (DEM) data increasingly popular, especially in regards to the study of floodplain flow. However, highresolution DEM data pose several disadvantages for floodplain modeling studies; e.g., the data sets contain many redundant interpolation points, large numbers of calculation...

A deterministic dynamic element matching (DEM) approach to ADC testing is introduced and compared with a common random DEM method. With both approaches, a highly non-ideal DAC is used to generate an excitation for a DUT that has linearity that far exceeds that of the test stimulus. Simulation results show that both methods can be used for testing of ADCs but with a substantial reduction in the ...

Bei der Analyse und dem Design drahtloser Kommunikationssysteme spielt die Modellierung und Simulation der Signalausbreitungswege eine immer wichtigere Rolle. Im Zusammenhang mit adaptiven Empfängerkonzepten für zukünftige Mobilfunksysteme sind dabei die räumlichen Ausbreitungseigenschaften auf dem Funkkanal von besonderem Interesse. Aus der Literatur sind verschiedene Modellierungsansätze beka...

Comprehension of wet particle behavior is great importance in science and engineering. In the past two decades, modeling simulation for particles have been extensively studied because their various industrial applications. The discrete element method (DEM) employed to simulate behavior. To calculate behavior, several capillary force models developed so far. Roughly speaking, are classified into...