Lattice Boltzmann parallel simulation of microflow dynamics over structured surfaces

Zhou, Wenning and Yan, Yuying and Liu, Xunliang and Liu, Baiqian (2017) Lattice Boltzmann parallel simulation of microflow dynamics over structured surfaces. Advances in Engineering Software . ISSN 0965-9978

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Abstract

In the present work, a parallel lattice Boltzmann multiphase model was developed to investigate the effects of surface structures on wettabilities and flow dynamics in a microchannel. The theory of wetting transition was firstly discussed. Then three types including triangular, rectangle and hierarchical shaped microstructures were constructed on the surface to examine the effects on wettabilities and drag reduction. It was found that flow behaviour is strongly affected by the surface morphology of the channel. The results indicated that hierarchical structures on the surface could improve the hydrophobicity significantly. For rectangular structures, they can improve the hydrophobicity with the increase of height and distance ratio h/d of the structures, and the improvement will reach its optimal hydrophobicity when the value h/d is over a certain value of 0.6. Moreover, to accelerate computational speed, the Open Multi-Processing (OpenMP) was employed for the parallelization of the model. A maximum speedup of 2.95 times was obtained for 4 threads on a multi-core CPU platform.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1016/j.advengsoft.2017.02.001
Depositing User: Eprints, Support
Date Deposited: 03 Mar 2017 12:10
Last Modified: 20 Mar 2017 04:56
URI: http://eprints.nottingham.ac.uk/id/eprint/41053

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