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Computation 2016, 4(1), 11;

Enhancing Computational Precision for Lattice Boltzmann Schemes in Porous Media Flows

Qatar Carbonates and Carbon Storage Research Centre (QCCSRC), Department of Chemical Engineering, South Kensington Campus, Imperial College London, London SW7 2AZ, UK
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
Author to whom correspondence should be addressed.
Academic Editors: Qinjun Kang and Li Chen
Received: 1 December 2015 / Revised: 2 February 2016 / Accepted: 9 February 2016 / Published: 17 February 2016
(This article belongs to the Special Issue Advances in Modeling Flow and Transport in Porous Media)
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We reassess a method for increasing the computational accuracy of lattice Boltzmann schemes by a simple transformation of the distribution function originally proposed by Skordos which was found to give a marginal increase in accuracy in the original paper. We restate the method and give further important implementation considerations which were missed in the original work and show that this method can in fact enhance the precision of velocity field calculations by orders of magnitude and does not lose accuracy when velocities are small, unlike the usual LB approach. The analysis is framed within the multiple-relaxation-time method for porous media flows, however the approach extends directly to other lattice Boltzmann schemes. First, we compute the flow between parallel plates and compare the error from the analytical profile for the traditional approach and the transformed scheme using single (4-byte) and double (8-byte) precision. Then we compute the flow inside a complex-structured porous medium and show that the traditional approach using single precision leads to large, systematic errors compared to double precision, whereas the transformed approach avoids this issue whilst maintaining all the computational efficiency benefits of using single precision. View Full-Text
Keywords: lattice Boltzmann; porous media; precision lattice Boltzmann; porous media; precision

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Gray, F.; Boek, E. Enhancing Computational Precision for Lattice Boltzmann Schemes in Porous Media Flows. Computation 2016, 4, 11.

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