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- Jan Abshagen, Juan Muñoz López, Francisco Marqués, Gerd Pfister
- Physical review letters
- 2005

The combined experimental and numerical study finds a complex mechanism of Z(2) symmetry breaking involving global bifurcations for the first time in hydrodynamics. In addition to symmetry breaking via pitchfork bifurcation, the Z(2) symmetry of a rotating wave that occurs in Taylor-Couette flow is broken by a global saddle-node-infinite-period (SNIP)… (More)

- Jan Abshagen, Gerd Pfister, Tom Mullin
- Physical review letters
- 2001

We report the results of the first experimental study of imperfect gluing bifurcations in an extended fluid flow. It is shown that the central features of the theory are robust and are appropriate to describe the dynamics of a nontrivial physical system. The results include the first experimental evidence for a route to chaos which is an essential part of… (More)

- Julia Langenberg, Gerd Pfister, Jan Abshagen
- Physical review. E, Statistical, nonlinear, and…
- 2004

Results of an experimental study of a Hopf bifurcation with broken translation symmetry that organizes chaotic homoclinic dynamics from a T2 torus in a fluid flow as a direct consequence of physical boundaries are presented. It is shown that the central features of the theory of Hopf bifurcation in O(2)-symmetric systems where the translation symmetry is… (More)

- Paul Glendinning, Jan Abshagen, Tom Mullin
- Physical review. E, Statistical, nonlinear, and…
- 2001

Experimental observations of an almost symmetric electronic circuit show complicated sequences of bifurcations. These results are discussed in the light of a theory of imperfect global bifurcations. It is shown that much of the dynamics observed in the circuit can be understood by reference to imperfect homoclinic bifurcations without constructing an… (More)

- Jan Abshagen, Matthias Heise, Julia Langenberg, Gerd Pfister
- Physical review. E, Statistical, nonlinear, and…
- 2007

We present the results of an experimental study on the transition to spiral vortices in flow between concentric counter-rotating cylinders in the presence of an axial through-flow, i.e., in spiral Poiseuille flow. The experiments were performed in an apparatus having an aspect ratio Gamma=L/d=22.8 ( L axial length, d gap width between cylinders) and end… (More)

- Julia Langenberg, Gerd Pfister, Jan Abshagen
- Physical review. E, Statistical, nonlinear, and…
- 2003

Experimental evidence for standing waves resulting from a supercritical Hopf bifurcation that appears as the first pattern-forming instability in counterrotating Taylor-Couette flow is presented. Depending on the aspect ratio two different types of standing waves, denoted as SW0 and SW(pi), could be observed. Both modes have an azimuthal wave number m=1 but… (More)

- Jan Abshagen, J von Stamm, Matthias Heise, Ch Will, Gerd Pfister
- Physical review. E, Statistical, nonlinear, and…
- 2012

We report the results of an experimental study on the multiplicity of states in Taylor-Couette flow as a result of axial localization of azimuthally rotating waves. Localized states have been found to appear hysteretically from time-dependent Taylor-Couette flow at Reynolds numbers significantly above the onset of wavy Taylor vortices. These localized… (More)

- Ch Hoffmann, Matthias Heise, +4 authors Manfred Lücke
- Physical review. E, Statistical, nonlinear, and…
- 2009

Stable domain walls which are realized by a defect between oppositely traveling spiral waves in a pattern-forming hydrodynamic system, i.e., Taylor-Couette flow, are studied numerically as well as experimentally. A nonlinear mode coupling resulting from the nonlinearities in the underlying momentum balance is found to be essential for the stability of the… (More)

- Matthias Heise, Ch Hoffmann, Jan Abshagen, Adrienn Pintér, Gerd Pfister, Manfred Lücke
- Physical review letters
- 2008

We present a new mechanism that allows the stable existence of domain walls between oppositely traveling waves in pattern-forming systems far from onset. It involves a nonlinear mode coupling that results directly from the nonlinearities in the underlying momentum balance. Our work provides the first observation and explanation of such strongly nonlinearly… (More)