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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 87: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)

CPP 87.11: Vortrag

Donnerstag, 19. März 2020, 12:15–12:30, ZEU 255

Simulations of Thermal Fluctuations with a Thin Film Lattice Boltzmann Model — •Stefan Zitz¹, Jens Harting^1,2, and Andrea Scagliarini³ — ¹Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Nuremberg, Germany — ²Eindhoven University of Technology, Eindhoven, The Netherlands — ³Consiglio Nazionale delle Ricerche, Rome, Italy

The effect of thermal fluctuations on thin film flows is an interesting yet challenging phenomenon. Although in experiments their presence is undeniable thermal fluctuations are often neglected in the analysis of the results. Also in simulations their inclusion is far from being trivial due to the stochastic nature of the fluctuations.

Here we present a numerical approach to include the influence of thermal fluctuations. Based on our newly developed lattice Boltzmann method we show how to effectively match the thin film regime and further how to include thermal fluctuations in a self consistent matter [1].

One problem of deterministic thin film simulations is the discrepancy between experimental and simulated rupture times in dewetting experiments. It has been shown that the experimental rupture times are shorter than the ones predicted by deterministic simulations. We will show that adding fluctuations does reduce the rupture time to better match the experimental results. To this end we will also address the importance of the fluid substrate interaction, e.g. the equilibrium contact angle θ_eq.
S. Zitz, J. Harting et al., Phys. Rev. E 100:3, 033313, 2019