- Numerical modeling and simulation
- Computational fluid dynamics
- Microfluid Dynamics
- X-ray tomography and radiography.
Teilprojekt P4 - Fragmentation in Large Scale DEM Simulations
(Third Party Funds Group – Sub project)Overall project: Skalenübergreifende Bruchvorgänge: Integration von Mechanik, Materialwissenschaften, Mathematik, Chemie und Physik (FRASCAL)
Term: 2. January 2019 - 31. December 2027
Funding source: DFG / Graduiertenkolleg (GRK)
During the past decade, the technique of Discrete Element Simulations (DEM) made great progress and by now it is generally acknowledged as a reliable tool for bulk solids description in a variety of applications. There is a number of models available in the literature to describe fragmentation of particles in DEM simulations, however, by now the predictive power of these models is still poor, especially when dealing with fragmentation probabilities and fragment size distribution. Current approaches use purely spherical models and there is still a gap in predictive fragmentation models for non-spherical particles.
The aim of the present research project is to develop a particle model which allows for both realistic modelling of fragmentation in DEM simulations and at the same time highly efficient large scale simulations.
Teilprojekt P9 - Adaptive Dynamic Fracture Simulation
(Third Party Funds Group – Sub project)Overall project: Fracture across Scales: Integrating Mechanics, Materials Science, Mathematics, Chemistry, and Physics (FRASCAL)
Term: 2. January 2019 - 31. December 2027
Funding source: DFG / Graduiertenkolleg (GRK)
In the simulation of continuum mechanical problems of materials with heterogeneities caused e.g. by a grained structure on a smaller scale compared to the overall dimension of the system, or by the propagation of discontinuities like cracks, the spatial meshes for finite element simulations are typically consisting of coarse elements to save computational costs in regions where less deformation is expected, as well as finely discretised areas to be able to resolve discontinuities and small scale phenomena in an accurate way. For transient problems, spatial mesh adaption has been the topic of intensive research and many strategies are available, which refine or coarsen the spatial mesh according to different criteria. However, the standard is to use the same time step for all degrees of freedom and adaptive time step controls are usually applied to the complete system.
The aim of this project is to investigate the kinetics of heterogeneous, e.g. cracked material, in several steps by developing suitable combinations of spatial and temporal mesh adaption strategies.
Fracture across Scales: Integrating Mechanics, Materials Science, Mathematics, Chemistry, and Physics (FRASCAL)
(Third Party Funds Group – Overall project)Term: 1. January 2019 - 31. December 2027
Funding source: DFG / Graduiertenkolleg (GRK)
The RTG aims to improve understanding of fracture in brittle heterogeneous materials by developing simulation methods able to capture the multiscale nature of failure. With i) its rooting in different scientific disciplines, ii) its focus on the influence of heterogeneities on fracture at different length and time scales as well as iii) its integration of highly specialised approaches into a “holistic” concept, the RTG addresses a truly challenging cross-sectional topic in mechanics of materials. Although various simulation approaches describing fracture exist for particular types of materials and specific time and length scales, an integrated and overarching approach that is able to capture fracture processes in different – and in particular heterogeneous – materials at various length and time resolutions is still lacking. Thus, we propose an RTG consisting of interdisciplinary experts from mechanics, materials science, mathematics, chemistry, and physics that will develop the necessary methodology to investigate the mechanisms underlying brittle fracture and how they are influenced by heterogeneities in various materials. The insights obtained together with the methodological framework will allow tailoring and optimising materials against fracture. The RTG will cover a representative spectrum of brittle materials and their composites, together with granular and porous materials. We will study these at length and time scales relevant to science and engineering, ranging from sub-atomic via atomic and molecular over mesoscale to macroscopic dimensions. Our modelling approaches and simulation tools are based on concepts from quantum mechanics, molecular mechanics, mesoscopic approaches, and continuum mechanics. These will be integrated into an overall framework which will represent an important step towards a virtual laboratory eventually complementing and minimising extensive and expensive experimental testing of materials and components. Within the RTG, young researchers under the supervision of experienced PAs will perform cutting-edge research on challenging scientific aspects of fracture. The RTG will foster synergies in research and advanced education and is intended to become a key element in FAU‘s interdisciplinary research areas “New Materials and Processes” and “Modelling–Simulation–Optimisation”.
- Blank, M., Nair, P., & Pöschel, T. (2023). Modeling surface tension in Smoothed Particle Hydrodynamics using Young-Laplace pressure boundary condition. Computer Methods in Applied Mechanics and Engineering, 406. https://dx.doi.org/10.1016/j.cma.2023.115907
- Goemez, L.R.R., Garciea, N.A., & Pöschel, T. (2023). Macroscopic analogue to entangled polymers. Soft Matter. https://dx.doi.org/10.1039/d3sm00148b
- Götz, H., & Pöschel, T. (2023). DEM-simulation of thin elastic membranes interacting with a granulate. Granular Matter, 25(4). https://dx.doi.org/10.1007/s10035-023-01344-9
- Götz, H., & Pöschel, T. (2023). Granular meta-material: response of a bending beam. Granular Matter, 25(3). https://dx.doi.org/10.1007/s10035-023-01336-9
- Roy, S., Pöschel, T., & Shaheen, M.Y. (2023). Effect of cohesion on the structure of powder layers in additive manufacturing. Granular Matter. https://dx.doi.org/10.1007/s10035-023-01349-4
- Santarossa, A., D'Angelo, O., Sack, A., & Pöschel, T. (2023). Effect of particle size on the suction mechanism in granular grippers. Granular Matter, 25(1). https://dx.doi.org/10.1007/s10035-022-01306-7
- Santarossa, A., Ortellado, L., Sack, A., Gómez, L.R., & Pöschel, T. (2023). A device for studying fluid-induced cracks under mixed-mode loading conditions using x-ray tomography. Review of Scientific Instruments, 94(7). https://dx.doi.org/10.1063/5.0145709
- Varela Rosales, N., Santarossa, A., Engel, M., & Pöschel, T. (2023). Granular binary mixtures improve energy dissipation efficiency of granular dampers. Granular Matter, 25(3). https://dx.doi.org/10.1007/s10035-023-01337-8
- Yoshii, K., Takada, S., Kurosawa, K., & Pöschel, T. (2023). Rheology of dilute granular gas mixtures where the grains interact via a square shoulder and well potential. Physics of Fluids, 35(1). https://dx.doi.org/10.1063/5.0132127
- Brilliantov, N.V., Osinsky, A.I., & Pöschel, T. (2022). Boltzmann Equation in Aggregation Kinetics. In Léon Brenig, Nikolai Brilliantov, Mustapha Tlidi (Eds.), Nonequilibrium Thermodynamics and Fluctuation Kinetics. (pp. 191-216). Springer Science and Business Media Deutschland GmbH.
- Götz, H., Santarossa, A., Sack, A., Pöschel, T., & Müller, P. (2022). Soft particles reinforce robotic grippers: robotic grippers based on granular jamming of soft particles. Granular Matter, 24(1). https://dx.doi.org/10.1007/s10035-021-01193-4
- Roy, S., Xiao, H., Shaheen, M.Y., & Pöschel, T. (2022). Local Structural Anisotropy in Particle Simulations of Powder Spreading in Additive Manufacturing.
- Takada, S., Serero, D., & Pöschel, T. (2022). Transport coefficients for granular gases of electrically charged particles. Journal of Fluid Mechanics, 935. https://dx.doi.org/10.1017/jfm.2022.37
- Torres Menendez, H., Altshuler, E., Brilliantov, N., & Pöschel, T. (2022). Lack of collective motion in granular gases of rotators. New Journal of Physics, 24(7). https://dx.doi.org/10.1088/1367-2630/ac78fb
- Wenzel, T., Sack, A., Müller, P., Pöschel, T., Schuldt-Lieb, S., & Gieseler, H. (2022). Erratum to: Stability of freeze-dried products subjected to microcomputed tomography radiation doses. Journal of Pharmacy and Pharmacology, 74(3), 458-. https://dx.doi.org/10.1093/jpp/rgab174
- Zhao, S.-C., & Pöschel, T. (2022). Collective motion of granular matter subjected to swirling excitation. Physical Review E, 105. https://dx.doi.org/10.1103/PhysRevE.105.L022902
- Goychuk, I., & Pöschel, T. (2021). Fingerprints of viscoelastic subdiffusion in random environments: Revisiting some experimental data and their interpretations. Physical Review E, 104(3). https://dx.doi.org/10.1103/PhysRevE.104.034125
- Goychuk, I., & Pöschel, T. (2021). Insufficient evidence for ageing in protein dynamics. Nature Physics. https://dx.doi.org/10.1038/s41567-021-01269-1
- Goychuk, I., & Pöschel, T. (2021). Nonequilibrium Phase Transition to Anomalous Diffusion and Transport in a Basic Model of Nonlinear Brownian Motion. Physical Review Letters, 127(11). https://dx.doi.org/10.1103/PhysRevLett.127.110601
- Marzulli, V., Cisneros, L.A.T., Di Lernia, A., Windows-Yule, C.R.K., Cafaro, F., & Pöschel, T. (2021). Correction to: Impact on granular bed: validation of discrete element modeling results by means of two-dimensional finite element analysis (Granular Matter, (2020), 22, 1, (27), 10.1007/s10035-019-0988-1). Granular Matter, 23(2). https://dx.doi.org/10.1007/s10035-021-01117-2
- Marzulli, V., Sandeep, C.S., Senetakis, K., Cafaro, F., & Pöschel, T. (2021). Scale and water effects on the friction angles of two granular soils with different roughness. Powder Technology, 377, 813-826. https://dx.doi.org/10.1016/j.powtec.2020.09.060
- Nair, P., Mühlbauer, S., Roy, S., & Pöschel, T. (2021). Can Minkowski tensors of a simply connected porous microstructure characterize its permeability? Physics of Fluids, 33(4). https://dx.doi.org/10.1063/5.0045701
- Rahbari, S.H.E., Otsuki, M., & Pöschel, T. (2021). Fluctuations and like-torque clusters at the onset of the discontinuous shear thickening transition in granular materials. Communications Physics, 4(1). https://dx.doi.org/10.1038/s42005-021-00574-8
- Schiochet Nasato, D., Briesen, H., & Pöschel, T. (2021). Influence of vibrating recoating mechanism for the deposition of powders in additive manufacturing: Discrete element simulations of polyamide 12. Additive Manufacturing, 48. https://dx.doi.org/10.1016/j.addma.2021.102248
- Scholz, C., Ldov, A., Pöschel, T., Engel, M., & Loewen, H. (2021). Surfactants and rotelles in active chiral fluids. Science Advances, 7(16). https://dx.doi.org/10.1126/sciadv.abf8998
- Shakeri, A., Schiochet Nasato, D., Müller, P., Torres Menendez, H., & Pöschel, T. (2021). A robust numerical method for granular hydrodynamics in three dimensions. Journal of Fluid Mechanics, 917. https://dx.doi.org/10.1017/jfm.2021.291
- Weinhart, T., Lechman, J., & Pöschel, T. (2021). Fragmentation and abrasion in granular matter systems. Computational Particle Mechanics, 8(5), 1003-1004. https://dx.doi.org/10.1007/s40571-021-00442-w
- Wenzel, T., Sack, A., Müller, P., Pöschel, T., Schuldt-Lieb, S., & Gieseler, H. (2021). Stability of freeze-dried products subjected to microcomputed tomography radiation doses. Journal of Pharmacy and Pharmacology, 73(2), 212-220. https://dx.doi.org/10.1093/jpp/rgaa004
- Zhao, S.C., & Pöschel, T. (2021). Spontaneous formation of density waves in granular matter under swirling excitation. Physics of Fluids, 33(8). https://dx.doi.org/10.1063/5.0056143
- Goychuk, I., & Pöschel, T. (2020). Finite-range viscoelastic subdiffusion in disordered systems with inclusion of inertial effects. New Journal of Physics, 22(11). https://dx.doi.org/10.1088/1367-2630/abc603
- Goychuk, I., & Pöschel, T. (2020). Hydrodynamic memory can boost enormously driven nonlinear diffusion and transport. Physical Review E, 102(1). https://dx.doi.org/10.1103/PhysRevE.102.012139
- Gómez, L.R., García, N.A., & Pöschel, T. (2020). Packing structure of semiflexible rings. Proceedings of the National Academy of Sciences of the United States of America, 117(7), 3382-3387. https://dx.doi.org/10.1073/pnas.1914268117
- Kollmer, J., Shreve, T., Claussen, J., Gerth, S., Salamon, M., Uhlmann, N.,... Pöschel, T. (2020). Migrating Shear Bands in Shaken Granular Matter. Physical Review Letters, 125(048001). https://dx.doi.org/10.1103/PhysRevLett.125.048001
- Marzulli, V., Torres Cisneros, L.A., di Lernia, A., Windows-Yule, C.R.K., Cafaro, F., & Pöschel, T. (2020). Impact on granular bed: validation of discrete element modeling results by means of two-dimensional finite element analysis. Granular Matter, 22(1). https://dx.doi.org/10.1007/s10035-019-0988-1
- Müller, P., Sack, A., & Pöschel, T. (2020). Misconceptions about gyroscopic stabilization. American Journal of Physics, 88(3), 175-181. https://dx.doi.org/10.1119/10.0000517
- Nair, P., Torres Cisneros, L.A., Windows-Yule, C.R.K., Agrawal, N., Roy, S., & Pöschel, T. (2020). A first-order segregation phenomenon in fluid-immersed granular systems. Powder Technology, 373, 357-361. https://dx.doi.org/10.1016/j.powtec.2020.06.036
- Pollmann, C., Haug, M., Reischl, B., Prölß, G., Pöschel, T., Rupitsch, S.,... Friedrich, O. (2020). Growing old too early: Skeletal muscle single fiber biomechanics in ageing r349p desmin knock-in mice using the myorobot technology. International Journal of Molecular Sciences, 21(15), 1-18. https://dx.doi.org/10.3390/ijms21155501
- Sack, A., Windows-Yule, K., Heckel, M., Werner, D., & Pöschel, T. (2020). Granular dampers in microgravity: sharp transition between modes of operation. Granular Matter, 22(2). https://dx.doi.org/10.1007/s10035-020-01017-x
- Schiochet Nasato, D., & Pöschel, T. (2020). Influence of particle shape in additive manufacturing: Discrete element simulations of polyamide 11 and polyamide 12. Additive Manufacturing, 36. https://dx.doi.org/10.1016/j.addma.2020.101421
- Schmidt, J., Parteli, E.J., Uhlmann, N., Wörlein, N., Wirth, K.-E., Pöschel, T., & Peukert, W. (2020). Packings of micron-sized spherical particles – Insights from bulk density determination, X-ray microtomography and discrete element simulations. Advanced Powder Technology. https://dx.doi.org/10.1016/j.apt.2020.03.018
- Strobl, S., Bannerman, M., & Pöschel, T. (2020). Robust event-driven particle tracking in complex geometries. Computer Physics Communications, 254, 107229. https://dx.doi.org/10.1016/j.cpc.2020.107229
- Torres Cisneros, L.A., Marzulli, V., Windows-Yule, C.R.K., & Pöschel, T. (2020). Impact in granular matter: Force at the base of a container made with one movable wall. Physical Review E, 102(1). https://dx.doi.org/10.1103/PhysRevE.102.012903
- Torres Menendez, H., Sack, A., & Pöschel, T. (2020). Granular Leidenfrost effect in microgravity. Granular Matter, 22(3). https://dx.doi.org/10.1007/s10035-020-01040-y