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DY: Fachverband Dynamik und Statistische Physik

DY 62: Poster - Dynamics

DY 62.10: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

Simulation of the Chain Fountain — •Lukas Zwirner, Volker Becker, and Klaus Kassner — Otto-von-Guericke Universität Magdeburg, Institut für Theoretische Physik/Computerorientierte Theoretische Physik

Although chain dynamics is a subject of investigation since the 17th century, chains exhibit various counterintuitive behaviors, e. g. the end of a chain falls faster than g, due to tension (Hamm, Geminard: Am. J. Phys., Vol 78, No. 8. Aug. 2010).

Another spectacular example — the chain fountain — was investigated by Biggins et al. (Proc. R. Soc. A 470, 2014) inspired by a famous youtube video, which was made by Steve Mould and scored ∼1.5 million views. Such a chain fountain can be established by pulling an appropriate chain, resting in a beaker, over the rim. Then, it ’flows’ out due to gravity. However, instead of just sliding on the rim the chain forms a fountain. Biggins et al. argued that the origin of the chain fountain should be a pushing reaction force from the beaker during pickup process.

Our aim is to simulate these phenomena. Therefore a two-dimensional DEM simulation for granular matter was altered to allow links between polygonal particles, represented by damped springs. This allows us to study the behavior of different 2D chains with little restrictions (the chain elements need to be convex polygons) and to get detailed insight into the forces and tensions acting in the chain and thus into the origin of the fountain formation.