T. Lichtenegger
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View article: An efficient, moments-based approximation for deviation propagators of recurrent flows
An efficient, moments-based approximation for deviation propagators of recurrent flows Open
A simple, data-assisted and physics-based approach for recurrent fluid dynamics is presented, and approximations for the application to macroscopic problems are developed. Large-step predictions are built upon sufficiently similar referenc…
View article: NeuralDEM for real time simulations of industrial particular flows
NeuralDEM for real time simulations of industrial particular flows Open
The discrete element method (DEM) is a highly accurate and versatile approach for modeling large-scale particulate and fluid-mechanical systems critical to industrial processes. Additionally, DEM offers integration with grid-based computat…
View article: Recurrence computational fluid dynamics for efficient predictions of long-term particle deposition on a cylinder
Recurrence computational fluid dynamics for efficient predictions of long-term particle deposition on a cylinder Open
Particle deposition on an object from a turbulent flow is of considerable interest in many applications. Numerical predictions using conventional computational fluid dynamics (CFD) are challenging due to that a large number of individual d…
View article: NeuralDEM -- Real-time Simulation of Industrial Particulate Flows
NeuralDEM -- Real-time Simulation of Industrial Particulate Flows Open
Advancements in computing power have made it possible to numerically simulate large-scale fluid-mechanical and/or particulate systems, many of which are integral to core industrial processes. Among the different numerical methods available…
View article: Control of segregation by non-uniform aeration in a fluidized bed spray granulator
Control of segregation by non-uniform aeration in a fluidized bed spray granulator Open
Controlling and influencing the rate of particle growth in spray granulators is key for consistent product quality and size, while reducing energy consumption and product re-circulation. To this end, we have implemented a new control devic…
View article: Data-assisted, physics-informed propagators for recurrent flows
Data-assisted, physics-informed propagators for recurrent flows Open
A novel approach to simulate dynamic, recurrent flows with very large time steps is presented. Data-driven forecasts based on the method of analogues are made employing a set of precomputed time series segments of flow fields. These predic…
View article: Transport in turbulent, recurrent flows: Time-extrapolation and statistical symmetrization
Transport in turbulent, recurrent flows: Time-extrapolation and statistical symmetrization Open
We investigate bubble dynamics in a submerged double-jet as an example of weakly coupled, Lagrangian transport. The setup resembles continuous casting of steel at Reynolds numbers Re = 136000 to Re = 272000. Using short time series of flow…
View article: Steel Alloy Homogenization During Rheinsahl–Heraeus Vacuum Treatment: Conventional Computational Fluid Dynamics, Recurrence Computational Fluid Dynamics, and Plant Observations
Steel Alloy Homogenization During Rheinsahl–Heraeus Vacuum Treatment: Conventional Computational Fluid Dynamics, Recurrence Computational Fluid Dynamics, and Plant Observations Open
Computational fluid dynamics (CFD) simulations of steel flow in an Rheinsahl–Heraeus (RH) process are realized by a discrete phase model (DPM) for the driving bubble plumes, a volume of fluid (VoF) method for the free surface in the vacuum…
View article: Toward Data‐Assisted Particle‐Fluid Simulations of Heat Transfer in Blast Furnaces
Toward Data‐Assisted Particle‐Fluid Simulations of Heat Transfer in Blast Furnaces Open
Detailed particle‐fluid simulations of moving bed reactors such as blast furnaces (BFs) are computationally very expensive. The wide range of temporal scales from short‐lived micromechanics to slow, macroscopic transport makes it almost im…
View article: Simulation of spray coating in a spouted bed using recurrence CFD
Simulation of spray coating in a spouted bed using recurrence CFD Open
Although numerical models such as the computational fluid dynamics–discrete element method(CFD–DEM) have enabled the accurate simulation of laboratory-scale apparatuses, the application ofthese methods to large-scale apparatuses with many …
View article: Extremely fast simulations of heat transfer in fluidized beds
Extremely fast simulations of heat transfer in fluidized beds Open
Besides their huge technological importance, fluidized beds have attracted a large amount of research because they are perfect playgrounds to investigate highly dynamic particulate flows. Their over-all behavior is determined by short-last…
View article: Onset of sediment transport in mono- and bidisperse beds under turbulent shear flow
Onset of sediment transport in mono- and bidisperse beds under turbulent shear flow Open
In this paper, we present a study on the onset of sediment motion of particles under turbulent shear flow. We use a fully resolved coupled lattice Boltzmann–discrete element solver to study the behavior of monodisperse and bidisperse beds …
View article: Adaptive coarse-graining for large-scale DEM simulations
Adaptive coarse-graining for large-scale DEM simulations Open
The large time and length scales and, not least, the vast number of particles involved in industrial-scale simulations inflate the computational costs of the Discrete Element Method (DEM) excessively. Coarse grain models can help to lower …
View article: Identification of block-like movement in cohesive and non-cohesive spouted bed operations
Identification of block-like movement in cohesive and non-cohesive spouted bed operations Open
Spouted beds are widely used in the chemical and process industries for a large variety of processes. Good understanding of the transport phenomena in these systems is of great importance to improve the design and scale-up procedure [1]. G…
View article: Pattern formation in laminar flow of suspensions through square channels
Pattern formation in laminar flow of suspensions through square channels Open
The study of particulate suspensions flowing through narrow channels has received much attention in the last decades, especially with advance in the field of microfluidics devices. In square channels, it is known that particles in dilute susp…
View article: CFD‐DEM modelling of blast furnace tapping
CFD‐DEM modelling of blast furnace tapping Open
The campaign length of a blast furnace is limited by the hearth inner lining lifetime. In order to maximize the campaign length and ensure a good draining of hot metal and slag, a good understanding of the flow in the hearth is essential. …
View article: Modelling of chemical reactions in metallurgical processes
Modelling of chemical reactions in metallurgical processes Open
Iron-ore reduction has attracted much interest in the last three decades since it can be considered as a core process in steel industry. The iron-ore is reduced to iron with the use of blast furnace and fluidized bed technologies. To inves…