Diploma student, graduate student, postdoctoral researcher
Dr. Thomas Schwager
Bruker AXS, Berlin
Schwager, Dr. Thomas
Publications
Research Projects
Research Projects
Research Projects
Research Projects
Research Projects
Coefficient of restitution as a fluctuating quantity
Physical Review E 84, 041306
(2011)
Fractal Substructures due to Fragmentation and Reagglomeration
AIP Conference Proceedings 1145, 859-862
(2009)
Coefficient of tangential restitution for viscoelastic spheres
The European Physical Journal E, 27, 107-114
(2008)
Coefficient of tangential restitution for the linear dashpot model
Physical Review E, 77, 011304
(2008)
Coefficient of restitution for viscoelastic spheres: The effect of delayed recovery
Physical Review E, 78, 051304
(2008)
Fractal Substructure of a Nanopowder
Physical Review Letters 100, 218002
(2008)
Contact of granular particles and the simulation of rapid flows using event-driven molecular dynamics
European Journal of Environmental and Civil Engineering 12, 827-870
(2008)
Close-packed granular clusters: hydrostatics and persistent Gaussian fluctuations
Granular Matter 10, 21-27
(2007)
Coefficient of restitution and linear dashpot model revisited
Granular Matter 9, 465-469
(2007)
Long-time behavior of granular gases
Modelling and numerics of kinetic dissipative systems (Pareschi, L. and Russo, G. and Toscani, G.), Nova Science, Hauppauge NY
(2006)
Abstract
The most striking phenomenon in the dynamics of granular gases is the formation of clusters and other structures. We investigate a gas of dissipatively colliding particles with a velocity dependent coefficient of restitution where cluster formation occurs as a transient phenomenon. Although for small impact velocity the particles collide elastically, surprisingly the temperature converges to zero.
Efficient numerical simulation of granular matter using the Bottom-To-Top Reconstruction method
Behavior of Granular Media (Walzel, P.; Grochowski, R.; Kruelle, C.; and Linz, S. J.), 151 - 159. Aachen: Shaker.
(2006)
Rolling friction and bistability of rolling motion
Powders & Grains 2005: Proceedings of the 5th International Conference on Micromechanics of Granular Media (Garcia-Rojo, R., Herrmann, H. J., McNamara, S.) 2, 505-509. Taylor & Francis.
(2005)
Computational Granular Dynamics - Models and Algorithms
Springer, Berlin, Heidelberg, New York
(2005)
Transient clusters in granular gases
Journal of Physics: Condensed Matter 17, S2705–S2713
(2005)
Erratum: Giant fluctuations at a granular phase separation threshold [Phys. Rev. E 69, 021302 (2004)]
Physical Review E 69, 059905
(2004)
Transient structures in a Granular Gas
Physical Review Letters 93, 134301
(2004)
Giant fluctuations at a granular phase separation threshold
Physical Review E 69, 021302
(2004)
Violation of Molecular Chaos in dissipative gases
International Journal of Modern Physics C 13, 1263-1272
(2002)
Rigid body dynamics of railway ballast
System Dynamics and Long-Term Behaviour of Railway Vehicles, Track and Subgrade (Popp, K., and Schiehlen, W.), 451-470. Berlin: Springer.
(2002)
Long-time behavior of granular gases with impact-velocity dependent coefficient of restitution
Physica A 325, 274-283
(2002)
Scaling properties of granular materials
Physical Review E 64, 011308
(2001)
Can we scale granular systems?
Powders and Grains 2001: Proceedings of the Fourth International Conference on Micromechanics of Granular Media, Sendai, 21-25 May 2001 (Kishino, Y.), 439-442. Rotterdam: Balkema.
(2001)
Vertically shaken column of spheres. Onset of fluidization
European Physical Journal E 4, 233-239
(2001)
Fluidization of granular material by vertical shaking
Mechanics for a New Millennium - Proceedings of the 20th International Congress on Theoretical and Applied Mechanics, held in Chicago, USA, 27 August - 2 September 2000 (Aref, H. and Philips, J.W.). Dortrecht: Kluwer.
(2000)
Onset of fluidization in vertically shaken granular material
Physical Review E 62, 1361-1367
(2000)
Rolling friction of a hard cylinder on a viscous plane
European Physical Journal B 10, 169-174
(1999)
Coefficient of restitution of colliding viscoelastic spheres
Physical Review E 60, 4465-4472
(1999)
Coefficient of normal restitution of viscous particles and cooling rate of granular gases
Physical Review E 57, 650-654
(1998)
Comment on “Clustering of Granular Assemblies with Temperature Dependent Restitution under Keplerian Differential Rotation”
Physical Review Letters 80, 5708
(1998)
Coefficient of restitution of viscous particles and cooling rate of granular gases
Physical Review E, 57, 650-654
(1998)
Abstract
Materials
We investigate the cooling rate of a gas of inelastically interacting particles. When we assume velocity-dependent coefficients of restitution the material cools down slower than with constant restitution. This behavior might have a large influence to clustering and structure formation processes.
Is there a critical acceleration for the onset of convection?
Physics of Dry Granular Media: Proceedings of the NATO Advanced Study Institute, Cargese, France, September 15-26, 1997 (H. J. Herrmann and J.-P. Hovi and S. Luding) 350, 625-631. Dortrecht: Kluwer.
(1998)
Contact of viscous spheres
Friction, Arching and Contact Dynamics (Wolf, D. E. and Grassberger, P.), 293-299, World Scientific, Singapore
(1997)
Abstract
Materials
In a recent paper an implicit equation for contacting viscoelastic spheres was derived [1]. Integrating this equation it can be shown that the coefficient of normal restitution ε depends on the impact velocity g as 1- ε ∼ g^⅕
Die Kühlrate eines granularen Gases
Dynamik, Evolution, Strukturen: Nichtlineare Dynamik und Statistik komplexer Strukturen (Freund, J.), 237-246. Berlin: Köster.
(1996)
Cooling rate of a granular gas (in German)
Dynamik, Evolution, Strukturen: Nichtlineare Dynamik und Statistik komplexer Strukturen (Freund, J.) 237-246, Köster, Berlin
(1996)
Abstract
Materials
Das dissipative Verhalten granularer Gase ist wegen seiner ungewöhnlichen Eigenschaften von großem wissenschaftlichen Interesse. Goldhirsch and Zanetti [1] und McNamara und Young [2] zeigten, dass ein homogen initialisiertes granulares Gas im Laufe der Zeit instabil ist – nach einiger Zeit der Abkühlung durch dissipative Stöße bilden sich räumliche Dichteinhomogenitäten und schließlich Cluster.