Dresden 2017 – wissenschaftliches Programm
CPP 44.6: Vortrag
Mittwoch, 22. März 2017, 16:15–16:30, HÜL 186
Microscopic derivation of the hydrodynamics of active-Brownian-particle suspensions — Stefano Steffenoni1, •Gianmaria Falasco2, and Klaus Kroy2 — 1Max planck for the mathematics in the science, leipzig — 2Institute for theoretical physics, leipzig
We derive the hydrodynamic equations of motion for a fluid of active particles described by under- damped Langevin equations that reduce to the Active-Brownian-Particle model, in the overdamped limit. The contraction into the hydrodynamic description is performed by locally averaging the particle dynamics with the non-equilibrium many-particle probability density, whose formal expres- sion is found in the physically relevant limit of high-friction through a multiple-time-scale analysis. This approach permits to identify the conditions under which self-propulsion can be subsumed into the fluid stress tensor and thus to define systematically and unambiguously the local pressure and surface tension of the active fluid.