Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Micro and Nanofluidics II
CPP 38.4: Vortrag
Donnerstag, 25. März 2010, 10:15–10:30, H39
Fluid-surface interaction models in Lattice-Boltzmann simulations — •Calin Dan1, Martin Hecht1,2, and Jens Harting1,3 — 1Institute for Computational Physics, Universität Stuttgart, Pfaffenwaldring 27, 70569 Stuttgart, Germany — 2High Performance Computing Center, Universität Stuttgart, Nobelstraße 19, 70569 Stuttgart, Germany — 3Department of Applied Physics, Technische Universiteit Eindhoven, Den Dolech 2, 5600 MB Eindhoven, The Netherlands
An accurate description of fluid-surface interactions is critical for simulations of microfluidic setups. The Molecular Dynamics method is preferred by many researchers to simulate the related phenomena, but these simulations are computationally extremely demanding. Alternatively, the Lattice-Boltzmann method can model the complex phenomena taking place at fluid-surface interfaces by applying for example a phenomenological model, which is based on the well-known Shan-Chen multi-component Lattice-Boltzmann model. However, it is a priori not clear how the influence of parameters like the temperature, charges, or impurities can be taken into account. In this work, we investigate the formulation of fluid-surface interactions within the Lattice-Boltzmann method and quantitatively compare our results to Molecular Dynamics simulations. We calibrate our model parameters using surface tension measurements and apply different implementations to investigate the behavior of a droplet in a capillary with complex fluid-surface interactions.