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D. Toneian, G. Kahl, G. Gompper, R. G. Winkler:
"Non-Newtonian Hydrodynamics in Generalized Multiparticle Collision Dynamics";
Talk: Vienna Theory Lunch Club Seminar, Wien (invited); 2015-12-01.

When studying systems where macroscopic objects are dissolved in a fluid, one may want to investigate phenomena where hydrodynamic interactions play an important role: the movement of particles induces a flow field, which in turn propagates and may influence far-away objects in interesting ways. In these cases, one can neither simply neglect the solvent, nor perform computer simulations on an atomistic scale since they are impracticably expensive, due to the orders of magnitude separating the characteristic length- and time-scales of the solvent and the solute. So-called "mesoscale" simulation techniques try to find a compromise, capturing the physically relevant aspects of the system while being computationally efficient. One such technique, called Multi-Particle Collision Dynamics, is described, and an extension is presented that allows one to simulate a viscoelastic (non-Newtonian) solvent. Some characteristic properties of such fluids are explored, from the points of view of both theory and simulation.

Project Head Gerhard Kahl:
DFS