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Priv.-Doz. Dr. Günther Grün

Universität Bonn

Cascadic thin film dewetting: experiment and simulation

Abstract: Recently, Herminghaus, Jacobs, and Seemann succeeded to determine quantitatively the effective interface potential of thin liquid film systems. Their data were used as an input for a dimensionalized version of the thin film equation, and precise simulations of complex dewetting scenarios became achievable for the first time. In such a way, insight in dominant dewetting mechanisms was gained which allowed to predict novel dewetting morphologies. In this talk, we will sketch the modeling aspects and we will compare experimental and numerical results with each other. The main emphasis, however, will be on the special features of entropy consistent finite element schemes for the thin film equation which is fourth order degenerate parabolic. A subtle discretization of the arising nonlinearities turns out to be the key ingredient to guarantee efficiency, convergence, and preservation of non-negativity.
Zeit: Freitag, 10. Januar, 2003, 14.15 Uhr
Ort:FU Berlin, Arnimallee 2-6, Raum 032 im EG

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