TY  - JOUR
A1  - Zienicke, Egbert
A1  - Seehafer, Norbert
A1  - Li, B.-W.
A1  - Schumacher, Jörg
A1  - Politano, H.
A1  - Thess, H.
T1  - Voltage-driven instability of electrically conducting fluids
Y1  - 2003
ER  - 
TY  - INPR
A1  - Zienicke, Egbert
A1  - Seehafer, Norbert
A1  - Feudel, Fred
T1  - Bifurcations in two-dimensional Rayleigh-Bénard convection
N2  - Two-dimensional bouyancy-driven convection in a horizontal fluid layer with stress-free boundary conditions at top and bottom and periodic boundary conditions in the horizontal direction is investigated by means of numerical simulation and bifurcation-analysis techniques. As the bouyancy forces increase, the primary stationary and symmetric convection rolls undergo successive Hopf bifurcations, bifurcations to traveling waves, and phase lockings. We pay attention to symmetry breaking and its connection with the generation of large-scale horizontal flows. Calculations of Lyapunov exponents indicate that at a Rayleigh number of 2.3×105 no temporal chaos is reached yet, but the system moves nonchaotically on a 4-torus in phase space.
T3  - NLD Preprints - 42 
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14534
ER  - 
TY  - JOUR
A1  - Zienicke, Egbert
A1  - Seehafer, Norbert
A1  - Feudel, Fred
T1  - Bifurcations in two-dimensional Rayleigh-Bénard convection
Y1  - 1998
ER  - 
TY  - BOOK
A1  - Zienicke, Egbert
A1  - Seehafer, Norbert
A1  - Feudel, Fred
T1  - Bifurcations in two-dimensional Rayleigh-Bénard convection
T3  - Preprint NLD
Y1  - 1997
SN  - 1432-2935
VL  - 42
PB  - Univ. Potsdam
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Seehafer, Norbert
A1  - Zienicke, Egbert
A1  - Feudel, Fred
T1  - Absence of magnetohydrodynamic activity in the voltage-driven sheet pinch
Y1  - 1996
ER  - 
TY  - INPR
A1  - Seehafer, Norbert
A1  - Zienicke, Egbert
A1  - Feudel, Fred
T1  - Absence of magnetohydrodynamic activity in the voltage-driven sheet pinch
N2  - We have numerically studied the bifurcation properties of a sheet pinch with impenetrable stress-free boundaries. An incompressible, electrically conducting fluid with spatially and temporally uniform kinematic viscosity and magnetic diffusivity is confined between planes at x1=0 and 1. Periodic boundary conditions are assumed in the x2 and x3 directions and the magnetofluid is driven by an electric field in the x3 direction, prescribed on the boundary planes. There is a stationary basic state with the fluid at rest and a uniform current J=(0,0,J3). Surprisingly, this basic state proves to be stable and apparently to be the only time-asymptotic state, no matter how strong the applied electric field and irrespective of the other control parameters of the system, namely, the magnetic Prandtl number, the spatial periods L2 and L3 in the x2 and x3 directions, and the mean values B¯2 and B¯3 of the magnetic-field components in these directions.
T3  - NLD Preprints - 32 
Y1  - 1996
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14328
ER  - 
TY  - BOOK
A1  - Seehafer, Norbert
A1  - Zienicke, Egbert
A1  - Feudel, Fred
T1  - Absence of magnetohydrodynamic activity in the voltage-driven sheet
T3  - Preprint NLD
Y1  - 1996
VL  - 32
PB  - Univ.
CY  - Potsdam
ER  -