An improved contact modification routine for a computationally efficient CFD simulation of packed beds

Particle-resolved computational fluid dynamics (PRCFD) is the most detailed modeling approach for fixed bed reactors. A major issue of PRCFD is to ensure a high quality of the underlying 3D calculation mesh around the particle-particle and particle-wall contacts, which otherwise results in convergen...

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Autores principales:	Martin Kutscherauer, Sebastian Böcklein, Gerhard Mestl, Thomas Turek, Gregor D. Wehinger
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Particle-resolved computational fluid dynamics Contact modification Meshing Transport phenomena Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/97b6d3004e9c44f6b71ca23fab131bdb
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spelling	oai:doaj.org-article:97b6d3004e9c44f6b71ca23fab131bdb2021-11-14T04:36:00ZAn improved contact modification routine for a computationally efficient CFD simulation of packed beds2666-821110.1016/j.ceja.2021.100197https://doaj.org/article/97b6d3004e9c44f6b71ca23fab131bdb2022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121001125https://doaj.org/toc/2666-8211Particle-resolved computational fluid dynamics (PRCFD) is the most detailed modeling approach for fixed bed reactors. A major issue of PRCFD is to ensure a high quality of the underlying 3D calculation mesh around the particle-particle and particle-wall contacts, which otherwise results in convergence problems. A still unresolved challenge, especially for packed beds of non-spherical particles, is to avoid this poor-quality mesh at contacts by modification of the packed bed geometry, while providing a reasonable number of mesh cells and physical accuracy. Based on the so called local caps method, a novel mesh-type independent routine was developed to modify all occurring contacts of a packed bed of rings and to generate a computationally efficient high-quality mesh. Thereby, one of the two particles involved in a point or line contact was inflated and used as cap geometry, whereas area contacts were combined via the contact surface. The impact of the cap size on mesh quality, packed bed structure, fluid flow and heat transport was investigated for a technically relevant slender packed bed under various conditions. For a small ratio between solid and fluid thermal conductivity (λPλF≤23.1), and ReP=50−600, a cap size smaller than 0.8% of the outer particle diameter did not have significant impact on the simulation results. To apply the approach to other packing structures and particle shapes, it is recommended to investigate at least three different cap sizes to determine at which cap size the independence from contact modification is achieved.Martin KutscherauerSebastian BöckleinGerhard MestlThomas TurekGregor D. WehingerElsevierarticleParticle-resolved computational fluid dynamicsContact modificationMeshingTransport phenomenaChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 9, Iss , Pp 100197- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Particle-resolved computational fluid dynamics Contact modification Meshing Transport phenomena Chemical engineering TP155-156
spellingShingle	Particle-resolved computational fluid dynamics Contact modification Meshing Transport phenomena Chemical engineering TP155-156 Martin Kutscherauer Sebastian Böcklein Gerhard Mestl Thomas Turek Gregor D. Wehinger An improved contact modification routine for a computationally efficient CFD simulation of packed beds
description	Particle-resolved computational fluid dynamics (PRCFD) is the most detailed modeling approach for fixed bed reactors. A major issue of PRCFD is to ensure a high quality of the underlying 3D calculation mesh around the particle-particle and particle-wall contacts, which otherwise results in convergence problems. A still unresolved challenge, especially for packed beds of non-spherical particles, is to avoid this poor-quality mesh at contacts by modification of the packed bed geometry, while providing a reasonable number of mesh cells and physical accuracy. Based on the so called local caps method, a novel mesh-type independent routine was developed to modify all occurring contacts of a packed bed of rings and to generate a computationally efficient high-quality mesh. Thereby, one of the two particles involved in a point or line contact was inflated and used as cap geometry, whereas area contacts were combined via the contact surface. The impact of the cap size on mesh quality, packed bed structure, fluid flow and heat transport was investigated for a technically relevant slender packed bed under various conditions. For a small ratio between solid and fluid thermal conductivity (λPλF≤23.1), and ReP=50−600, a cap size smaller than 0.8% of the outer particle diameter did not have significant impact on the simulation results. To apply the approach to other packing structures and particle shapes, it is recommended to investigate at least three different cap sizes to determine at which cap size the independence from contact modification is achieved.
format	article
author	Martin Kutscherauer Sebastian Böcklein Gerhard Mestl Thomas Turek Gregor D. Wehinger
author_facet	Martin Kutscherauer Sebastian Böcklein Gerhard Mestl Thomas Turek Gregor D. Wehinger
author_sort	Martin Kutscherauer
title	An improved contact modification routine for a computationally efficient CFD simulation of packed beds
title_short	An improved contact modification routine for a computationally efficient CFD simulation of packed beds
title_full	An improved contact modification routine for a computationally efficient CFD simulation of packed beds
title_fullStr	An improved contact modification routine for a computationally efficient CFD simulation of packed beds
title_full_unstemmed	An improved contact modification routine for a computationally efficient CFD simulation of packed beds
title_sort	improved contact modification routine for a computationally efficient cfd simulation of packed beds
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/97b6d3004e9c44f6b71ca23fab131bdb
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An improved contact modification routine for a computationally efficient CFD simulation of packed beds

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