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A novel model for direct numerical simulation of suspension dynamics with arbitrarily shaped convex particles

Marquardt, Jan E. ORCID iD icon 1; Hafen, Nicolas ORCID iD icon 1; Krause, Mathias J. 1,2
1 Institut für Mechanische Verfahrenstechnik und Mechanik (MVM), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte und Numerische Mathematik (IANM), Karlsruher Institut für Technologie (KIT)

Abstract:

This study presents an innovative direct numerical simulation approach for complex particle systems with irregular shapes and large numbers. Using partially saturated methods, it accurately models arbitrary shapes, albeit at considerable computational cost when integrating a compatible contact model. The introduction of a novel parallelization strategy significantly improves the performance of the contact model, enabling efficient four-way coupled simulations. Through hindered settling studies, the criticality of the explicit contact model for maintaining simulation accuracy is highlighted, especially at high particle volume fractions and low Archimedes numbers. The feasibility of simulating thousands of arbitrarily shaped convex particles is demonstrated with up to 1934 surface-resolved particles. The study also confirms the grid independence and linear convergence of the method. It shows for the first time that cube swarms settle 13 to 26% slower than swarms of volume-equivalent spheres across different Archimedes numbers (500 to 2000) and particle volume fractions (10 to 30%). These findings emphasize the shape dependence of particle systems and suggest avenues for exploring their nuanced dynamics.


Verlagsausgabe §
DOI: 10.5445/IR/1000173002
Veröffentlicht am 13.08.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte und Numerische Mathematik (IANM)
Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2024
Sprache Englisch
Identifikator ISSN: 0010-4655, 1386-9485, 1879-2944
KITopen-ID: 1000173002
Erschienen in Computer Physics Communications
Verlag Elsevier
Band 304
Seiten Art.-Nr.: 109321
Vorab online veröffentlicht am 18.07.2024
Schlagwörter Discrete contact model, Particle-resolved simulation, Homogenized lattice Boltzmann method, Partially saturated methods, Hindered settling
Nachgewiesen in Web of Science
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Scopus
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