Dresden 2006 – wissenschaftliches Programm

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SYSS: Structure Formation and Self-Organization in non-equilibrium Systems

SYSS 3: Structure Formation and Self-Organization in non-equilibrium Systems - Poster

SYSS 3.17: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

The Effect of an Axial Flow on Spiral Vortices and Taylor Vortices — •Christian Hoffmann — Institut für Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken

We present numerical simulations of vortices that appear via primary bifurcations out of the unstructured circular Couette flow in the Taylor-Couette system with counter- and co-rotating cylinders. The full Navier-Stokes equations are solved with a combination of a finite difference and a Galerkin method for fixed axial periodicity lengths of the vortex patterns as well as for finite systems with rigid nonrotating lids. Differences in structure, dynamics, symmetry properties, bifurcation and stability behavior between spiral vortices and Taylor vortices are discussed in quantitative detail and compared to experimental spiral data. Furthermore, we analyze how the above properties are changed by an externally imposed axial through-flow. In particular we investigate when left handed or right handed spirals or toroidally closed Taylor vortices are preferred.