Pit Polfer

Fraunhofer Institute for Mechanics of Materials

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Torsten Kraft

Fraunhofer Institute for Mechanics of Materials

Andreas Roosen

Friedrich-Alexander-Universität Erlangen-Nürnberg

Zongwen Fu

Friedrich-Alexander-Universität Erlangen-Nürnberg

Thomas Breinlinger

Fraunhofer Institute for Mechanics of Materials

Claas Bierwisch

Fraunhofer Institute for Mechanics of Materials

Andreas Wonisch

Materials and Systems Research (United States)

Andreas Heunisch

Federal Institute For Materials Research and Testing

Tünde Fülöp

Chalmers University of Technology

François Nicot

Université Grenoble Alpes

Armin Dellert

Friedrich-Alexander-Universität Erlangen-Nürnberg

Cooperative Institutions

Fraunhofer Institute for Mechanics of Materials

Friedrich-Alexander-Universität Erlangen-Nürnberg

Fraunhofer Society

Aix-Marseille Université

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Université Grenoble Alpes

University of Calgary

Institut des Géosciences de l'Environnement

Animal, Santé, Territoires, Risques et Ecosystèmes

Centre National de la Recherche Scientifique

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Surface tension and wetting effects with smoothed particle hydrodynamics

Journal of Computational Physics (2013)

Thomas Breinlinger Pit Polfer Adham Hashibon Torsten Kraft

Particle (ecology)

Volume fraction

Wetting transition

Smoothed Particle Hydrodynamics

Tension (geology)

10.1016/j.jcp.2013.02.038

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Citations (93)

Scaling laws for implicit viscosities in smoothed particle hydrodynamics

EPJ Web of Conferences (2017)

Claas Bierwisch Pit Polfer

Smoothed particle hydrodynamics (SPH) is a particle-based method which solves continuum equations such as the Navier-Stokes equations. A periodic fluidic system under homogeneous shear is studied using SPH in the present work. The total pressure of the system and the shear stress contributions from the SPH interaction terms for pressure and viscosity as well as the contribution caused by velocity fluctuations are analyzed. It is found that the pressure and the shear stress contributions obey certain scaling laws depending on physical properties of the system such as compressibility, viscosity and shear rate as well as the spatial resolution. Some of the identified relations resemble scaling laws for the rheology of dense granular flows. These findings render an assessment of the convergence with respect to the spatial resolution of SPH simulations possible. Furthermore, the similarities between numerical SPH particles and physical grains in dense flow provide a deeper understanding of the nature of the SPH method.

Smoothed Particle Hydrodynamics

Scaling law

Pressure gradient

Compressible flow

10.1051/epjconf/201714015008

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Citations (2)

Influence of the Doctor Blade Shape on Tape Casting—Comparison Between Analytical, Numerical, and Experimental Results

Journal of the American Ceramic Society (2016)

Pit Polfer Zongwen Fu Thomas Breinlinger Andreas Roosen Torsten Kraft

In this study, the influence of the shape of the doctor blade on the flow inside the tape casting unit and on the resulting tape properties is investigated both numerically and experimentally. Using the results from the analysis of the produced tape and from the simulations of the flow inside the tape casting unit, the relationships between blade geometry and the particle orientation in the resulting tape, as well as the resulting tape thickness, are shown. Additionally, the experimentally and numerically obtained results were compared to an analytical model for the prediction of the tape thickness. The simulations were carried out using the particle‐based smoothed particle hydrodynamics method using a non‐Newtonian fluid model to describe the ceramic slurry. Both in experiment and simulation, the influence of the blade geometry on the resulting tape shows good agreement.

Tape casting

Smoothed Particle Hydrodynamics

Particle (ecology)

10.1111/jace.14343

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Citations (19)

Smoothed particle hydrodynamics simulation of nonspherical particle suspensions

Pit Polfer Andreas Wonisch Torsten Kraft

Smoothed Particle Hydrodynamics

Particle (ecology)

Source

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Citations (0)

Correlation Between Anisotropic Green Microstructure of Spherical‐Shaped Alumina Particles and Their Shrinkage Behavior

Journal of the American Ceramic Society (2015)

Zongwen Fu Pit Polfer Torsten Kraft Andreas Roosen

Dimensional control is one of the basic problems in ceramic processing, especially for tape cast ceramic sheets which are used to build up multilayer structures for high‐integrated components. Uncontrolled anisotropic shrinkage can cause geometrical distortion and circuit failure of multilayer ceramics during sintering. The understanding of the relationship between green tape microstructure and shrinkage anisotropy is of great importance for further miniaturization of multilayer devices. In this study, alumina powders with spherical particle shape were used to cast green tapes. The microstructure as well as the pore orientation and the shrinkage behavior were analyzed. According to the sintering theory, grain growth and pore elimination are the two most important mechanisms to describe sintering shrinkage. In this work, three‐dimensional shrinkage behavior of tape cast alumina powders with spherical particle shape was investigated and correlated with pore orientation in the microstructure. Specifically, the reason for the different shrinkage in z ‐direction compared to the lateral shrinkage is in focus. The study is based on experiments as well as on mathematical visualization.

Shrinkage

Green body

Particle (ecology)

10.1111/jace.13567

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Citations (10)

Suspension modeling using smoothed particle hydrodynamics: Accuracy of the viscosity formulation and the suspended body dynamics

Applied Mathematical Modelling (2015)

Pit Polfer Torsten Kraft Claas Bierwisch

Smoothed Particle Hydrodynamics

Suspension

Solver

Particle (ecology)

Volume fraction

Viscous liquid

10.1016/j.apm.2015.10.013

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Citations (15)

Mechanics of densely packed snow across scales: A constitutive modeling strategy based on the 3D H-Model

Journal of Glaciology (2025)

Marie Miot Antoine Wautier Pit Polfer Pierre Philippe Tünde Fülöp

10.1017/jog.2024.112

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Citations (0)

Three-dimensional shrinkage behavior of green tapes derived from spherical-shaped powders: Experimental studies and numerical simulations

Journal of the European Ceramic Society (2015)

Zongwen Fu Pit Polfer Torsten Kraft Andreas Roosen

Shrinkage

Shearing (physics)

10.1016/j.jeurceramsoc.2015.01.032

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Citations (11)

A Comprehensive Simulation Scheme for Tape Casting: From Flow Behavior to Anisotropy Development

Journal of the American Ceramic Society (2011)

Andreas Wonisch Pit Polfer Torsten Kraft Armin Dellert Andreas Heunisch

A new simulation scheme for tape casting is presented and applied. The model allows considering both the macroscopic flow behavior and the orientation of individual particles inside the ceramic slurry. It is based on the smoothed particle hydrodynamics method, a particle‐based computational fluid dynamics solver, and Jeffery's equations of particle motion, which describe the rotation of rigid, ellipsoidal particles in a fluid. It is shown how different process parameters and the rheological behavior of the slurry influence its flow behavior, which in turn affects the orientation of nonspherical particles inside the slurry. The simulations predict that a preferred, anisotropic particle orientation develops in the green tapes, whose extent depends mainly on the powder properties. All simulations are performed with real tape‐casting data concerning geometry of casting unit, casting parameters, slurry rheology, and powder properties. The anisotropy results are confirmed by experimental analysis of cross sections of tape‐cast films made from different powders.

Tape casting

Particle (ecology)

Ellipsoid

Smoothed Particle Hydrodynamics

10.1111/j.1551-2916.2010.04358.x

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Citations (38)