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Abstract: Exploring the hydrodynamic boundary of a surface by approaching a colloidalsphere and measuring the occurring drag force is a common experimentaltechnique. However, numerous parameters like the wettability and surfaceroughness influence the result. In experiments these cannot be separatedeasily. For a deeper understanding of such surface effects a tool is requiredthat predicts the influence of different surface properties. In this paper wepresent computer simulations based on the lattice Boltzmann method of a spheresubmerged in a Newtonian liquid. We show that our method is able to reproducethe theoretical predictions for flat and noninteracting surfaces. In order toprovide high precision simulation results the influence of finite size effectshas to be well controlled. Therefore we study the influence of the requiredsystem size and resolution of the sphere and demonstrate that already moderatecomputing resources allow the error to be kept below 1%.



Autor: Christian Kunert, Jens Harting

Fuente: https://arxiv.org/







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