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Multi-relaxation-time lattice Boltzmann model for axisymmetric flows

โœ Scribed by Liang Wang; Zhaoli Guo; Chuguang Zheng

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
504 KB
Volume
39
Category
Article
ISSN
0045-7930

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โœฆ Synopsis

a b s t r a c t

In this paper, a lattice-Boltzmann equation (LBE) with multi relaxation times (MRT) is presented for axisymmetric flows. The model is an extension of a recent model with single-relaxation-time [Guo et al., Phys. Rev. E 79, 046708 (2009)], which was developed based on the axisymmetric Boltzmann equation. Due to the use of the MRT collision model, the present model can achieve better numerical stability. The model is validated by some numerical tests including the Hagen-Poiseuille flow, the pulsatile Womersley flow, and the external flow over a sphere. Numerical results are in excellent agreement with analytical solutions or other available data, and the improvement in numerical stability is also confirmed.

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