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DY: Fachverband Dynamik und Statistische Physik

DY 22: Granular matter / contact dynamics I

DY 22.2: Talk

Wednesday, March 28, 2007, 16:00–16:15, H2

Granular detachment from a moving bulk — •Claas Bierwisch, Torsten Kraft, Michael Moseler, and Hermann Riedel — Fraunhofer-Institut für Werkstoffmechanik, Wöhlerstraße 11, 79108 Freiburg, Germany

Powder discharge under gravity from a moving reservoir into a cavity has been investigated using discrete element simulations. Agglomerate models were used besides spherical grain representations. Granular friction and cohesion have been calibrated within quasi two dimensional reference and validation experiments. While all models were able to predict flow rates for simple geometries they differ strongly when tested in fully three dimensional cavities and in the angles of repose which they form. Coarse graining effects on static and dynamic properties as well as universal scaling properties of velocity fields will be presented furthermore.