Explanipedia

Thermal discrete particle model of powder melting and coalescence in additive manufacturing Open

Mohamad Yousef Shaheen, Stefan Luding, Anthony R. Thornton, Thomas Weinhart · 2025

Laser powder bed fusion (LPBF) is an additive manufacturing technique that utilizes laser-induced melting of specific regions within a powder layer to create complex parts. Achieving high-quality products in LPBF requires the optimization …

DISCRETE ELEMENT MODELLING OF MOISTURE-LIMITED AEOLIAN SEDIMENT TRANSPORT Open

Xiuqi Wang, G.H.P. Campmans, Thomas Weinhart, Anthony R. Thornton, Stefan Luding , et al. · 2025

The presence of surface moisture on sandy beaches has long been acknowledged as a complicating factor in the process of aeolian sediment transport, reported by Belly (1964), Neuman and Scott (1998) and Davidson-Arnott et al. (2008). Many s…

Mixing indices in up-scaled simulations Open

Balázs Füvesi, Christoph Goniva, Stefan Luding, Vanessa Magnanimo · 2025

A Coarse-Grained Discrete Element Model (CG-DEM) based on parameter scaling for dense wet granular system Open

Roxana Saghafian Larijani, Vanessa Magnanimo, Stefan Luding · 2025

Low to high shear rate powder rheology in a rotational rheometer Open

Assem Zharbossyn, Saeed Mahdavy, Diego Barletta, Stefan Luding · 2025

Characterization techniques are essential for understanding powders’ complex behavior. Among different devices, the Anton Paar Powder Rheometer (MCR-302) was used to characterize high-density polyethylene (HDPE). The powder has a 214 μm me…

Population balance modelling and reconstruction by quadrature method of moments for wet granulation Open

Timo Plath, Stefan Luding, Thomas Weinhart · 2024

Densification of visco-elastic powders during free and pressure-assisted sintering Open

Juan E. Alvarez, Hongyang Cheng, Stefan Luding, Thomas Weinhart · 2024

This study presents an advanced computational model designed for the analysis of the densification process in visco-elastic powders during sintering. The model incorporates thermo-mechanical aspects into the discrete element method (DEM), …

Exploring moisture-constrained aeolian sediment transport through a discrete particle modelling framework Open

Xiuqi Wang, Gerhardus Hermanus Petrus Campmans, Thomas Weinhart, Anthony R. Thornton, Stefan Luding , et al. · 2024

Moisture is a crucial environmental factor that shapes the dynamics of aeolian sediment transport along coastal beaches. Despite the existence of empirical formulations, little is known about the mechanism through which moisture influences…

Contact rheological DEM model for visco-elastic powders during laser sintering Open

Juan E. Alvarez, A. H. Nijkamp, Hongyang Cheng, Stefan Luding, Thomas Weinhart · 2024

Laser sintering is a widely used process for producing complex shapes from particulate materials. However, understanding the complex interaction between the laser and particles is a challenge. This investigation provides new insights into …

Non-dimensionalisation of quadrature method of moments for wet granulation Open

Timo Plath, Stefan Luding, Thomas Weinhart · 2024

Wet granulation is a multiphase process utilised to produce aggregate particles with defined properties from fine powders. Simulating this process on the microscale is challenging because of the substantial number of particles involved, wh…

Thermal Discrete Particle Model of Powder Melting and Coalescence in Additive Manufacturing Open

Mohamad Yousef Shaheen, Stefan Luding, Anthony R. Thornton, Thomas Weinhart · 2024

Understanding slow compression of frictional granular particles by network analysis Open

Kianoosh Taghizadeh, Stefan Luding, Rituparna Basak, Lou Kondic · 2024

Compression of frictional granular matter proceeds via intermittent events associated with jumps in the overall kinetic energy and dramatic changes of force network structure.

Elastic–plastic intermittent re-arrangements of frictionless, soft granular matter under very slow isotropic deformations Open

Stefan Luding · 2023

How do soft granular materials (or dense amorphous systems) respond to externally applied deformations at different rates and for different system sizes? This long-standing question was intensively studied for shear deformations but only m…

The role of particle shape in computational modelling of granular matter Open

Jidong Zhao, Shiwei Zhao, Stefan Luding · 2023

X-ray 3D imaging–based microunderstanding of granular mixtures: Stiffness enhancement by adding small fractions of soft particles Open

Kianoosh Taghizadeh, Matthias Ruf, Stefan Luding, Holger Steeb · 2023

This research focuses on performing ultrasound propagation measurements and micro-X-ray computed tomography (µXRCT) imaging on prestressed granular packings prepared with biphasic mixtures of monodisperse glass and rubber particles at diff…

Sound characteristics of disordered granular disks: effects of contact damping Open

Kuniyasu Saitoh, Kianoosh Taghizadeh, Stefan Luding · 2023

We investigate numerically the sound properties of disordered dense granular packings in two dimensions. Employing linear equations of motion and excluding contact changes from our simulations, we demonstrate time evolution of sinusoidal s…

Discrete element modelling of grain-scale aeolian sediment transport on moist beach surface Open

Xiuqi Wang, Gerhardus Hermanus Petrus Campmans, Thomas Weinhart, Anthony R. Thornton, Stefan Luding , et al. · 2023

In coastal areas, aeolian sediment transport could show significant spatio-temporal variability as a result of varying beach surface properties. The observed morphological patterns also vary with surface conditions. Surface moisture is one…

The permeability of pillar arrays in microfluidic devices: an application of Brinkman's theory towards wall friction Open

Thejas Hulikal Chakrapani, Hanieh Bazyar, Rob G. H. Lammertink, Stefan Luding, Wouter K. den Otter · 2022

The Darcy permeability of floor-to-ceiling pillar arrays in microfluidic channels is studied by experiments and simulations. A simple and accurate estimation of the effective permeability is proposed.

Down to the root of vegetated soil: challenges and state-of-the-art Open

Hongyang Cheng, Floriana A. R. Anselmucci, Xinyan Fan, Yijian Zeng, Stefan Luding , et al. · 2022

Vegetated soil plays an essential role in confronting climate change. It is the host material where inorganic carbon is stored and green infrastructures are built. The expected impacts of climate change, such as extreme wetting-drying cycl…

Bulk modulus along jamming transition lines of bidisperse granular packings Open

Juan C. Petit, Nishant Kumar, Stefan Luding, Matthias Sperl · 2022

We present three-dimensional discrete element method simulations of bidisperse granular packings to investigate their jamming densities ϕ_{J} and dimensionless bulk moduli K as functions of the size ratio δ and the concentration of small p…

Concurrent multi-scale modeling of granular materials: Role of coarse-graining in FEM-DEM coupling Open

Hongyang Cheng, Anthony R. Thornton, Stefan Luding, Andrew L. Hazel, Thomas Weinhart · 2022

The finite element method (FEM) is commonly used for modeling continuum media, while particle simulation methods like the so-called discrete element method (DEM) are used for discrete systems. Coupling the discrete (DEM) and continuum (FEM…

Understanding slow compression and decompression of frictionless soft granular matter by network analysis Open

Stefan Luding, Kianoosh Taghizadeh, Cheng Chao, Lou Kondic · 2022

The evolution of dense granular systems under slow deformation is explained by network analysis.

Visco-elastic sintering kinetics in virgin and aged polymer powders Open

Juan E. Alvarez, Henk Snijder, Tom Vaneker, Hongyang Cheng, Anthony R. Thornton , et al. · 2021

This work provides a novel discrete element method (DEM) framework for modelling the visco-elastic sintering kinetics in virgin and aged polymer powders. The coalescence of particle pairs, over long times, is described by a combined three-…

Flow regimes and phase transitions in granular matter: multiscale modeling from micromechanics to continuum-editorial Open

Diego Berzi, Dalila Vescovi, Shunying Ji, Xikui Li, Stefan Luding · 2021

Un-jamming due to energetic instability: statics to dynamics Open

Stefan Luding, Yimin Jiang, Mario Liu · 2021

Jamming/un-jamming, the transition between solid- and fluid-like behavior in granular matter, is an ubiquitous phenomenon in need of a sound understanding. As argued here, in addition to the usual un-jamming by vanishing pressure due to a …

Granular buoyancy in the context of segregation of single large grains in dense granular shear flows Open

Marnix P. van Schrojenstein Lantman, Kasper van der Vaart, Stefan Luding, Anthony R. Thornton · 2021

Modeling of particle-size segregation in dense granular flows could benefit from a better understanding of the segregation behavior of individual large grains that are surrounded by smaller grains. In a previous study, the force in the dir…

Elastic waves in particulate glass-rubber mixtures Open

Kianoosh Taghizadeh, Holger Steeb, Stefan Luding, Vanessa Magnanimo · 2021

We investigate the propagation of waves in dense static granular packings made of soft and stiff particles subjected to hydrostatic stress. Physical experiments in a triaxial cell equipped with broadband piezoelectric wave transducers have…

Stochastic Model for Energy Propagation in Disordered Granular Chains Open

Kianoosh Taghizadeh, Rohit Shrivastava, Stefan Luding · 2021

Energy transfer is one of the essentials of mechanical wave propagation (along with momentum transport). Here, it is studied in disordered one-dimensional model systems mimicking force-chains in real systems. The pre-stressed random masses…

Drift-diffusive liquid migration in partly saturated sheared granular media Open

Sudeshna Roy, Stefan Luding, Wouter K. den Otter, Anthony R. Thornton, Thomas Weinhart · 2021

Bulk Modulus along Jamming Transition Lines of Bidisperse Granular Packings Open

Juan C. Petit, Nishant Kumar, Stefan Luding, Matthias Sperl · 2021

We present 3D DEM simulations of bidisperse granular packings to investigate their jamming densities, $ϕ_J$, and dimensionless bulk moduli, $K$, as a function of the size ratio, $δ$, and the concentration of small particles, $X_{\mathrm S}…

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