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CPP: Chemische Physik und Polymerphysik

CPP 10: POSTER Nonequilibrium Phenomena in Soft Condensed Matter

CPP 10.3: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Nonlinear dynamics of elastic nano-filaments — •Hirofumi Wada and Roland Netz — Physik Department, Technical University Munich, 85748 Garching, Germany

Dynamics of flexible filaments in viscous fluids, which is dominated by hydrodynamic dissipation and elasticity, is characterized by an intriguing interplay between geometry and physics. Examples are the motion of vortex lines in superconductors, the buckling and super-coiling of rubber tubes or long DNA molecules, and the swimming of bacteria flagella. We developed a dynamic simulation model of elastic filaments in low Reynolds number fluids, in which full couplings between stretch, bend and twist are properly taken into account and the hydrodynamic interaction is also incorporated within the Stokesian technique. We study non-linear dyanmics of filaments subjected to various external forces and boundary conditions. In particular, we describe the stretching instability of a flexible helical spring and the super-coiling behavior of an over-twisted straight filament, and provide some insights into the kinetics of those non-equilibrium phenomena.