Granular Matter in Fluids
The fascinating behaviour of granular assemblies with fluid is known to all of us from sunny days at the beach. To really describe the phenomena, the effect of the time-scales, introduced by the fluid transport on relaxation, fluid migration, and failure were studied in particle simulations and accompanying experiments. When fluids are particle suspensions, segregation, deposition, suffusion, backward erosion and bursts develop an additional dynamics of its own. In simulations one needs to couple particle models like Discrete Element Models and Lattice Boltzmann Models with continuum models to estimate for example the impact of debris flow with obstacles and protection means. We developed various new methods to address these challenging topics.
Outreach:
- F.K. Wittel, R. Mani, K. Melnikov, F. Bianchi, and H.J. Herrmann: Capillary interaction in wet granular assemblies: Part 2 in S. Antonyuk (Edt.): Particles in Contact - Micro Mechanics, Micro Process Dynamics and Particle Collective, Springer 2019, 277-310.
- K. Flouris, M. Mendoza, G. Munglani, F.K. Wittel, J.-D. Debus, H.J. Herrmann: Fluid Structure interaction with curved space lattice Boltzmann, in Computers & Fluids 168 (2018), 32-45.
- F. Bianchi, F.K. Wittel, M. Thielmann, P.Trtik, H.J. Herrmann: Tomographic Study of Internal Erosion of Particle Flows in Porous Media. Transport in Porous Media 122 (1/2018), 169-184; DOI:10.1007/s11242-017-0996-8.
- K. Melnikov, F.K. Wittel, H.J. Herrmann: Micro-mechanical Failure Analysis of Wet Granular Matter, Acta Geotechnica 11 (3/2016), 539-548.
- A. Leonardi, F.K. Wittel, M. Mendoza, R. Vetter, H.J. Herrmann: Particle-fluid-structure interaction for debris-flow impact on flexible barriers, Computer-Aided Civil and Infrastructure Engineering 31 (5/2016), 323–333.
- A. Leonardi, F.K. Wittel, M. Mendoza, H.J. Herrmann: Lattice-Boltzmann Method for Geophysical Plastic Flows, in W. Wu, R.I. Borja (Edts.) Recent advances in modelling landslides and debris flow, Springer Series in Geomechanics and Geoengineering (2014), pp. 131-140.
- K. Melnikov, R. Mani, F.K. Wittel, M. Thielmann, H.J. Herrmann: Grain Scale Modeling of Arbitrary Fluid Saturation in Random Packings, Physical Review E 92 (2015), 022206.
- A. Leonardi, M. Cabrera, F.K. Wittel, R. Kaitna, M. Mendoza, W. Wu, H.J. Herrmann: Granular front formation in free-surface flow of concentrated suspensions, Physical Review E 92 (2015), 052204.
- A. Leonardi, F.K. Wittel, M. Mendoza, H.J. Herrmann: Coupled DEM-LBM method for the free-surface simulation of heterogeneous suspensions, Computational Particle Mechanics 1 (1/2014), 3-13.
Marie Curie ITN (Initial Training Networks), Multi Scale Modelling of Landslides and Debris flow external pageMuMoLaDe and DFB Partikel im Kontakt – Mikromechanik, Mikroprozessdynamik und Partikelkollektive PiKO.