Time consumption in calculations of hydraulic and geometrical tortuosity in granular beds

• Autorzy: Sobieski Wojciech , Raoof Amir , Zech Alraune

Identyfikatory

DOI

10.31648/ts.5449

• Języki publikacji: EN

Abstrakty

EN

Tortuosity is one of the most elusive parameters of porous media due to its subjective estimation. Here, we compare two approaches for obtaining the tortuosity in granular porous media to investigate their capabilities and limitations. First, we determine the hydraulic tortuosity based on the calculated components of the velocity field obtained from flow simulations using the Lattice Boltzmann Method (LBM). Second, we directly determine the geometric tortuosity by making use of the Path Tracking Method (PTM) which only requires the geometric properties of the porous medium. In both cases, we apply the same geometrical structure which is a virtually generated 3D granular bed using the discrete element method consisting of 50 particles. Our results show that the direct PTM is much faster and more precise than the indirect approach based on the calculated velocity field. Therefore, PTM may provide a tool for calculating tortuosity for large 3D granular systems where indirect methods are limited due to the required computational power and time. While LBM considers various routes across the porous media implicitly, PTM identifies them explicitly. As a result, PTM requires a statistical post-processing. As an advantage, this can provide further information than just domain scale average values.

Słowa kluczowe

EN

granular porous media; geometric tortuosity; hydraulic tortuosity; Path Tracking Method; Discrete Element Method; Lattice Boltzmann Method

• Wydawca: Wydawnictwo Uniwersytetu Warmińsko-Mazurskiego w Olsztynie
• Czasopismo: Technical Sciences / University of Warmia and Mazury in Olsztyn
• Rocznik: 2020
• Tom: nr 23(1)
• Strony: 25--51
• Opis fizyczny: Bibliogr. 51 poz., rys., wykr.

Twórcy

autor

Sobieski Wojciech

• Katedra Mechaniki i Podstaw Konstrukcji Maszyn, Wydział Nauk Technicznych, Uniwersytet Warmińsko-Mazurski, ul. M. Oczapowskiego 11, 10-957 Olsztyn,

autor

Raoof Amir

• Environmental Hydrogeology, Department of Earth Sciences, Utrecht University, Netherlands

autor

Zech Alraune

• Environmental Hydrogeology, Department of Earth Sciences, Utrecht University, Netherlands

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).