Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 14: Complex Fluids
DY 14.2: Vortrag
Freitag, 4. März 2005, 15:45–16:00, TU H3010
A mesoscopic, particle-based model for fluid flow with a nonideal equation of state — •Thomas Ihle1, Erkan Tuzel1,2, and Daniel Kroll1 — 1Department of Physics, North Dakota State University, Fargo, ND 58105, USA — 2School of Physics and Astronomy, 116 Church Street SE, University of Minnesota, Minneapolis, MN 55414, USA
A recently introduced stochastic model for fluid flow, called Stochastic Rotation Dynamics (SRD), is a promising tool for the coarse-grained modeling of a fluctuating solvent, particularly for colloidal, vesicle and polymer suspensions. Instead of solving Navier-Stokes equations explicitly, the fluid is modelled by ”fluid”-particles with continuous velocities and efficient multi-particle collisions. It is shown how the transport coefficients can be calculated exactly and that they are in very good agreement with numerical simulations. A new extension of the model is presented where the collision rules depend on particle velocities which leads to a nonideal equation of state. These rules obey detailed-balance and an H-theorem. Transport coefficients, equation of state and speed of sound are calculated and compared with numerics.