University of Bayreuth

Faculty of Mathematics and Physics

Theoretical Physics II

D-95440 Bayreuth, Germany



Prof. Dr. Werner Pesch (pens.)


phone: (+49)-(0)921 / 55-3214

fax: (+49)-(0)921 / 55-2991

Recent Work

O. Zier, W. Zimmerman and W. Pesch
On low-Prandtl-number Convection in an Inclined Layer of Liquid Mercury ,
Journal of Fluid Mechanics 874 , p. 76 (2019)

W. Pesch, A. Krekhov, N. Éber and Á. Buka
Nonlinear analysis of flexodomains in nematic liquid crystals ,
Phys.Rev.E 98 ,032702(2018)

P. Subramanian, O. Brausch, E. Bodenschatz, K. Daniels, T.Schneider and W. Pesch
Spatio-temporal Patterns in Inclined Layer Convection ,
Journal of Fluid Mechanics 794 , p. 719 (2016)

A. Krekhov, B, Dressel, W. Pesch, V. A. Delev and E. S. Batyrshin
Spatio-temporal complexity of electroconvection patterns in nematic liquid crystals ,
Phys.Rev.E 92 ,062510(2015)

A. Krekhov, W. Decker, W. Pesch, N. Éber, P. Salomon,B. Fekete and Á. Buka
Patterns driven by combined AC and DC electric fields in nematic liquid crystals ,
Phys.Rev.E 89 ,052567(2014)

W.Pesch and A. Krekhov
Optical analysis of spatially periodic patterns in nematic liquid crystals: diffraction and shadowgraphy ,
Phys.Rev.E 87 , 052504, 2013

Á. Buka, T. Toth-Katona, N. Éber, A.Krekhov, and W.Pesch
The role of flexoelectricity in pattern formation ,
Chapt. 4 in Flexoelectricity in Liquid crystals, World Scientific, 2013

A.Krekhov, W.Pesch, and Á. Buka
Comment on:
On the threshold characteristics of the flexoelectric domains in a homogeneous electric field:
The case of anisotropic elasticity by Y.G. Marinov and H.P. Hinov, "
Euro.Phys.J E, 31 , 179-189, (2011)}

A.Krekhov, W.Pesch, and &Acute. Buka
Flexoelectricity and and pattern formation in nematic liquid crystals ,
Physical Review E, 83 ,051706(2011)

G.Freund, W.Pesch, and W. Zimmermann
Rayleigh-Bénard convection in the presence of spatial
temperature modulations
J. Fluid Mech. 673 , 318-348 (2011).

G. Ahlers, B. Dressel, J. Oh, and W. Pesch
Strong non-Boussinesq effects near the onset of convection in a fluid near its critical point ,
J. Fluid Mech. 642 , 15-48 (2010).

J.H. McCoy, W. Brunner, W. Pesch, and E. Bodenschatz
Selforganization of topological defects due to applied constraints ,
Phys. Rev. Lett. 101 , 254102 (2008)

G. Seiden, S. Weiss, J. H. McCoy, W. Pesch, and E. Bodenschatz
Pattern Forming System in the Presence of Different Symmetry-Breaking Mechanism ,
Phys.Rev.Lett. 101 , 214503 (2008)

A. Krekhov, W. Pesch, N. Éber, T. Toth-Katona and Á. Buka
Nonstandard electroconvection and flexoelectricity in nematic liquid crystals ,
Phys. Rev. E 77 , 021705 (2008)

W. Pesch, D. Palaniappan, J. Tao, and F. H. Busse
Convection in heated fluid layers subjected to time periodic horizontal accelerations ,
J. Fluid. Mech., 596 , 313 (2008)

K. E. Daniels, O. Brausch, W. Pesch and E. Bodenschatz
Competition and bistability of ordered undulations and undulation chaos in inclined layer convection ,
J. Fluid. Mech. , 597 , 261 (2008)

A. Buka, N. Eber, W.Pesch and L. Kramer,
Isotropic and anisotropic electroconvection , Physics Reports, 448 , 115-132 (2007)

Sheng-Qi Zhou, N. Eber, A. Buka, W.Pesch and G. Ahlers
Onset of electro-convection of homeotropically aligned nematic liquid crystals ,
Phys.Rev. E 74 , 046211 (2006)

W. Pesch, L. Kramer, N. Eber and A. Buka
The Role of Initial Conditions in the Decay of Spatially Periodic Patterns in a Nematic Liquid crystal ,
Phys.Rev. E 73 , 061705 (2006)

S. Madruga, H. Riecke and W. Pesch
Reentrant Hexagons in non-Boussinesq Convection ,
J.Fluid.Mech, 548 , 341 (2006)

F. Busse and W. Pesch
Thermal Convection in a Twisted Magnetic Field ,
Geophys. Astrophys. Fluid Dyn., 100 , 139 (2006)

S. Madruga, H. Riecke and W. Pesch
CGL Defect Chaos and Bursts in Hexagonal Rotating non-Boussinesq Convection ,
Phys.Rev.Lett. 96 , 074501 (2006)

A. Buka, N. Eber and W. Pesch
Convective Patterns in Liquid Crystals Driven by Electric Field , NATO Science Series "Self-assembly, pattern formation and growth phenomena in nano-systems" Eds: A.A.Golovin, A.A.Nepomnyashchy, Springer 2006, pp.55-82. and electronic-Liquid Crystals Communications (, July, 2005

J. L. Rogers, W. Pesch, O. Brausch and M. Schatz
Complex-Ordered Patterns in Shaken Convection ,
Phys. Rev. E, 71 , 066214 (2005)

N. Eber, S.A. Rozanski, S. Nemeth, A. Buka, W. Pesch and L. Kramer
Decay of Spatially Periodic Patterns in a Nematic Liquid Crystal ,
Phys. Rev. E, 70 , 061706 (2004)

A. Buka, B. Dressel, L. Kramer and W. Pesch
Direct transition to electroconvection in a homeotropic nematic liquid crystal , ,
Chaos, 14 , 793 (2004)

A. Buka, B. Dressel, L. Kramer and W. Pesch
Isotropic convection scenarios in an anisotropic fluid, ,
Phys. Rev. Lett., 93 , 044502 (2004)

Th. Walter, W. Pesch and E. Bodenschatz
Dislocation Dynamics in Rayleigh-Bénard Convection , ,
Chaos; 14 , 933 (2004)

J. L. Rogers, M. F. Schatz, W. Pesch, O. Brausch
An Initial Look at Acceleration-Modulated Thermal Convection , in New Directions in Statistical Physics-Applications in Econophysics, Bioinformatics and Pattern Recognition, L. T. Wille, ed., Berlin, Springer (2004)

E. Kurt, F.H. Busse and W. Pesch,
Hydromagnetic Convection in a Rotating Annulus with an Azimuthal Magnetic Field ,
J. Theor. Comp. Fluid Dyn. , 18 , 251 (2004)

M. Hilt, W. Pesch and W. Zimmermann
Two paradigms of spatiotemporal chaos: Spirals in convection and waves on biomembranes ,
NIC-Symposium 2004, Hrsg.: D. Wolf, G. Münster, M. Kremer, NIC Series Vol. 20, ISBN 3-00-012372-5, Verlag John von Neumann-Institut für Computing, Jülich

Yuan-Nan Young, H. Riecke and W. Pesch
Whirling Hexagons and Defect Chaos in Hexagonal Non-Boussinesq Convection ,
New J. Phys., 67 , 135 (2003)

B. Dressel and W. Pesch
Competion between electroconvection and Freedericksz distortions in nematics with slightly positive dielectric anisotropy ,
Phys. Rev. E 67 , 031707 (2003)

J. L. Rogers, M. F. Schatz, and W. Pesch,
Pattern formation in vertically oscillated convection ,
Nonlinearity, 16 , C1 (2003)

A. Buka, B. Dressel, W. Otkowski, K.Camara, T. Toth-Katona, L. Kramer, J. Lindau, G. Pelzl and W. Pesch,
Electroconvection in nematic liquid crystals with positive dielectric and negative conductivity anisotropy ,
Phys. Rev. E 66 , 051713 (2002),

K. M. J. Bajaj, G. Ahlers and W. Pesch < br> Rayleigh-Bénard convection with rotation at small Prandtl numbers. ,
Phys. Rev. E, 65 , 056309 (2002)

B. Dressel, L. Pastur, W. Pesch, E. Plaut, and R. Ribotta
On the competition between periodic and homogeneous modes in spatio-temporal pattern formation ,
Phys. Rev. Lett., 88 , 024503 (2002)

R. Schmitz, W. Zimmermann and W. Pesch
Spiral Defect Chaos: Swift-Hohenberg model versus Boussinesq equations ,
Phys. Rev. E, 65 , 037302 (2002)

C. Voeltz, W. Pesch and I. Rehberg,
Rayleigh-Taylor instability in a sedimenting suspension ,
Phys. Rev. E, 65 , 011404 (2002)

J. L. Rogers, O. Brausch, W. Pesch and M. F. Schatz,
Superlattice patterns in vertically oscillated thermal convection ,
Phys. Rev. Lett., 85 , 4281 (2000)

D. A. Egolf, I. V. Melnikov, W. Pesch, and R. E. Ecke,
Mechanism of Extensive Spatiotemporal Chaos in Rayleigh-Bénard Convection
Nature, 404 , 733 (2000)

E. Bodenschatz, W.Pesch and G. Ahlers,
Recent Developments in Rayleigh-Bénard Convection ,
Annu. Rev. Fluid Mech. 32 , 709-778 (2000).

F.H. Busse, O. Brausch, M. Jaletzky and W. Pesch
Phase turbulence and Heteroclinic Cycles in "Intermittency in Turbulent Flows", J.C. Vassilikos , ed., Cambridge University Press, 2000

L. Kramer and W. Pesch,
Electrohydrodynamic Convection in Nematics ,
in Physical properties of liquid crystals, Vol. 1, D.A. Dunmur, A. Fukuda, and G.R. Luckhurst eds., EMIS Datareview Series, 2000

L. Kramer and W. Pesch,
Convection Instabilities in Nematic Liquid Crystals,
in Macromolecular Systems: Microscopic interactions and Macroscopic Properties, H. Hoffmann, M. Schwoerer and T. Vogtmann eds., Wiley-VCH, 2000

L. Kramer, B. Dressel, H. Zhao and W.Pesch.
Theory of Electroconvection for the Gourmet ,
Mol. Cryst. and Liq. Cryst, 368 , 101, 2000 (Proceedings of the ILCC2000, Sendai, Japan )

S. Sakurai, A. Tschammer, W. Pesch and G. Ahlers
Rayleigh-Bénard Convection in the Presence of a First-Order Phase Change,
Phys. Rev. E, 60 , 539 (1999)

E. Plaut and W. Pesch
Extended Weakly Nonlinear Theory of Planar Nematic Convection,
Phys. Rev. E, 59 , 1747, (1999)

L. Thomas, W. Pesch and G. Ahlers
Rayleigh-Bénard convection in a homeotropically aligned nematic liquid crystal
Phys. Rev. E, 58 , 5885 (1998)

Y. Hu, W. Pesch, G. Ahlers and R. E. Ecke
Convection Under Rotation for Prandtl Numbers Near One: Küppers-Lortz Instability
Phys. Rev. E, 58 ,5821 (1998)

B.B. Plapp, D. A. Egolf, E. Bodenschatz and W.Pesch
Dynamics and Selection of Giant Spirals in Rayleigh-Bénard Convection
Phys. Rev. Lett., 81 , 5334 (1998)

W. Pesch and U. Behn
Electrohydrodynamic Convection in Nematics
in "Evolution of Spontaneous Structures in Dissipative Continuous Systems" F. H. Busse and S. C. Mueller, eds., Springer, 1998

E. Bodenschatz, M. Kaiser, L. Kramer, W. Pesch, A. Weber and W. Zimmermann
Patterns and Defects in Liquid Crystals
in "New Trends in Nonlinear Dynamics and Pattern-Forming Phenomena"
NATO ASI series, B: Physics Vol. 237, P. Coullet and P.Huerre, eds., Plenum , 1998

In Preparation

W. Brunner, J. McCoy, W. Pesch and E. Bodenschatz,
Hexaroll chaos in inclined layer convection
, Preprint

A. Moroz, W. Pesch, H. Riecke,
Stability of Hexagons in non-Boussinesq Convection ,
to be submitted to Phys. Rev. E.