Zusammenfassung Zur Simulation pastöser Materialien in der DEM wird ein Kontaktmodell vorgestellt, welches beim Kontaktverlust zweiter ursprünglich Kontakt befindlicher Partikel (diskrete Elemente) eine anziehende Kraft (Kohäsionskraft) basierend auf einem polynomischen Ansatz bildet. Dieses folglich kapillare ist somit Lage, pastöse für Industrie orientierte DEM-Simulationen nachzubilden. Zum ...

The simulation of ground clutter is the key and knot problem in radar simulation system. The simulation of ground clutter based on DEM is studied. It is introduced how to use fractal arithmetic to produce random digital elevation. After obtaining the orographic’s height, draw the 3D terrain with the OpenGL technology, in order to realize the demonstration of 3D terrain. Based on DEM, terrain is...

The paper describes the development and performance of parallel algorithms for the discrete element method (DEM) software. Spatial domain decomposition strategy and message passing inter-processor communication have been implemented in the DEMMAT code for simulation of visco-elastic frictional granular media. The novel algorithm combining link-cells for contact detection, the static domain deco...

Size reduction process is widely used in the chemical and pharmaceutical industries. Jetmill is one of the most commonly used tool for such processes due to advantages they over other mills such as low contamination and narrow product size distribution. However the efficiency of the jet milling process is very low, furthermore the jet-milling process is sensitive to many parameters such as feed...

A study of four constitutive contact models employed in discrete element analysis is presented. Most discrete element simulations employ simple contact models due to computational time constraints. However, few works are available in literature which evaluates the suitability of these simple models to simulate DEM applications. The influence of more complex models on bulk behavior is examined t...

Gegenstand des vorliegenden Artikels ist die Vorstellung des aktuellen Entwicklungstandes von POSEIDON, einem Werkzeug zur Modellierung, Simulation und Analyse von Petri-Netzen. Die breite Palette verfügbarer Simulationsund Analysealgorithmen sowie die konsequente Ausrichtung der Bedienkonzepte an die Bedürfnisse akademischer Anwender, prädestinieren POSEIDON für die Nutzung im wissenschaftlich...

In the application of microscopic simulation models, the importance of model calibration and validation cannot be overemphasized. A recent study proposed a systematic approach of conducting simulation model calibration and validation procedure on the basis of experimental design and optimization, and applied it to an isolated intersection using a VISSIM simulation model. This study further eval...

The benefit of using the Discrete Element Method (DEM) for simulations of fracture in heterogeneous media has been widely highlighted. However modeling large structure leads to prohibitive computations times. We propose to take advantage of Graphics Processor Units (GPUs) to reduce the computation time, taking advantage of the highly data parallel nature of DEM computations. GPUs are massively ...

We present a meshless simulation method for multiphase fluid-particle systems using Smoothed Particle Hydrodynamics (SPH) and the Discrete Element Method (DEM). Rather than fully resolving the interstitial fluid, which is often infeasible, we use an unresolved fluid model based on the locally averaged Navier Stokes equations. A variable-h SPH formulation is used to calculate the fluid phase, wh...

Ablaufsimulation ist eine mächtige und bedeutende Analysemethode, die vor dem Hintergrund zunehmender Vernetzung von Systemen und steigender Komplexität der Abläufe hohe Kosteneinsparungspotentiale bietet. Bei nicht fachgerechter Anwendung birgt die Methode allerdings erhebliche Risiken. Nur mit Verifikation und Validierung (V and V) zur Prüfung der Gültigkeit von Simulationsmodellen lassen sic...