Ch Hoffmann

End-wall effects on the transition between Taylor vortices and spiral vortices (2009)

Altmeyer, S., Hoffmann, Ch., Heise, M., Pinter, A., Lücke, M., Pfister, G.

We present numerical simulations as well as experimental results concerning transitions between Taylor vortices and spiral vortices in the Taylor-Couette system with rigid, non-rotating end-walls in...

Wave-number dependence of the transitions between traveling and standing vortex waves and their mixed states in the Taylor-Couette system (2008)

Pinter, A., Lücke, M., Hoffmann, Ch.

Previous numerical investigations of the stability and bifurcation properties of different nonlinear combination structures of spiral vortices in a counterrotating Taylor-Couette system that were...

Search for SUSY Particles in the 161 GeV Data (2007)

The Susy, V. Buscher, F. Cerutti, A. Colaleo, J. Dann, L. Duflot, ...

: The data collected by Aleph at 161 GeV have been searched for signals of Supersymmetry, and none have been found. These data and those collected last year at 130 and 136 GeV are used to set limits...

Bifurcation of standing waves into a pair of oppositely traveling waves with oscillating amplitudes caused by a three-mode interaction (2007)

Pinter, A., Lücke, M., Hoffmann, Ch.

A novel flow state consisting of two oppositely travelling waves (TWs) with oscillating amplitudes has been found in the counterrotating Taylor-Couette system by full numerical simulations. This...

Controlling the stability transfer between oppositely traveling waves and standing waves by inversion-symmetry-breaking perturbations (2006)

Pinter, A., Lücke, M., Hoffmann, Ch.

The effect of an externally applied flow on symmetry degenerated waves propagating into opposite directions and standing waves that exchange stability with the traveling waves via mixed states is...

Spin photocurrents and circular photon drag effect in (110)-grown quantum well structures (2006)

Shalygin, V. A., Diehl, H., Hoffmann, Ch., Danilov, S. N., Herrle, T., Tarasenko, S. A., ...

We report on the study of spin photocurrents in (110)-grown quantum well structures. Investigated effects comprise the circular photogalvanic effect and so far not observed circular photon drag...

Competition between Traveling Fluid Waves of Left and Right Spiral Vortices and Their Different Amplitude Combinations (2005)

Pinter, A., Lücke, M., Hoffmann, Ch.

Stability, bifurcation properties, and the spatiotemporal behavior of different nonlinear combination structures of spiral vortices in the counter rotating Taylor-Couette system are investigated by...

Spiral Vortices and Taylor Vortices in the Annulus between Rotating Cylinders and the Effect of an Axial Flow (2005)

Hoffmann, Ch., Lücke, M., Pinter, A.

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-rotating as well as with...

Spiral vortices traveling between two rotating defects in the Taylor-Couette system (2005)

Hoffmann, Ch., Lücke, M., Pinter, A.

Numerical calculations of vortex flows in Taylor-Couette systems with counter rotating cylinders are presented. The full, time dependent Navier-Stokes equations are solved with a combination of a...

Spiral and Taylor vortex fronts and pulses in axial through-flow (2003)

Pinter, A., Lücke, M., Hoffmann, Ch.

The influence of an axial through-flow on the spatiotemporal growth behavior of different vortex structures in the Taylor-Couette system with radius ratio eta=0.5 is determined. The Navier Stokes...