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LBM modelling unsteady flow past and through permeable diamond-shaped cylinders: Effects of aspect ratios and Darcy numbers

Yingchun Zhang (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China and School of Mechanical Engineering, Northwestern Polytechnical Univerisity, Xi’an, China)
Nesrin Ozalp (High Flux Gas Dynamics Laboratory (HFGL), Mechanical and Industrial Engineering Department, University of Minnesota-Duluth, USA)
Gongnan Xie (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China and Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 7 June 2019

Issue publication date: 11 September 2019

Abstract

Purpose

The purpose of this paper is to investigate the unsteady flow past through a permeable diamond-shaped cylinder and to study the effects of the aspect ratios and Darcy numbers of the cylinder.

Design/methodology/approach

The lattice Boltzmann method with D2Q9 lattice model was used to simulate the unsteady flow through permeable diamond-shaped cylinders. The present numerical method is validated against the available data.

Findings

The key findings are that increasing the permeability enhances the suppression of vortex shedding, and that the Strouhal number is directly proportion to the Darcy number, Reynolds number and the aspect ratio of the porous cylinder.

Originality/value

The present study considers unsteady laminar flow past through single permeable diamond-shaped cylinder. According to the authors’ knowledge, very few studies have been found in this field. The present findings are novel and original, which in turn can attract wide attention and citations.

Keywords

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51676163), the National 111 Project (B18041) and the Fundamental Research Funds of Shenzhen City (JCYJ20170306155153048).

Citation

Zhang, Y., Ozalp, N. and Xie, G. (2019), "LBM modelling unsteady flow past and through permeable diamond-shaped cylinders: Effects of aspect ratios and Darcy numbers", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 9, pp. 3472-3497. https://doi.org/10.1108/HFF-12-2018-0720

Publisher

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Emerald Publishing Limited

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