A1 Journal article (refereed)
Lattice Boltzmann Simulation of Flow-Induced Wall Shear Stress in Porous Media (2018)

Hyväluoma, J., Niemi, V., Thapaliya, M., Turtola, E., Järnstedt, J., & Timonen, J. (2018). Lattice Boltzmann Simulation of Flow-Induced Wall Shear Stress in Porous Media. Transport in Porous Media, 121(2), 353-368. https://doi.org/10.1007/s11242-017-0967-0

JYU authors or editors

Publication details

All authors or editors: Hyväluoma, Jari; Niemi, Vesa; Thapaliya, Mahesh; Turtola, Eila; Järnstedt, Jorma; Timonen, Jussi

Journal or series: Transport in Porous Media

ISSN: 0169-3913

eISSN: 1573-1634

Publication year: 2018

Volume: 121

Issue number: 2

Pages range: 353-368

Publisher: Springer Netherlands

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1007/s11242-017-0967-0

Publication open access: Not open

Publication channel open access: 

Abstract

The lattice Boltzmann method is increasingly utilized in the simulation of flow-induced wall shear stress needed in various applications. In image-based flow simulations, the simulation geometry is usually based on a three-dimensional reconstruction of the true structure of the pore space obtained, for example, by X-ray tomography. The geometry is then given in a voxel-based representation, which complicates an accurate determination of the surface-normal vectors that are necessary in the computation of the wall shear stress. To avoid this problem, we introduce here a method for the determination of surface-normal vectors directly from a greyscale image instead of its segmented binary image version. The proposed method is fast and automatic, and it can be used for an arbitrary pore space geometry provided in a greyscale form by any imaging modality. We show that this method can produce accurate surface-normal vectors even for binary images and that their accuracy is further increased when the original greyscale images are used instead. We compute wall shear stresses for generated benchmark geometries and then demonstrate the utility of the method for soil samples with ‘random’ pores imaged by X-ray tomography.

Free keywords: lattice Boltzmann method; wall shear stress; flow simulation; porous media; voxel geometry; soil structure

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Ministry reporting: Yes

VIRTA submission year: 2018

JUFO rating: 1