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Pré-Publication, Document De Travail Année : 2018

On anti bounce back boundary condition for lattice Boltzmann schemes

Résumé

In this contribution, we recall the derivation of the anti bounce back boundary condition for the D2Q9 lattice Boltzmann scheme. We recall various elements of the state of the art for anti bounce back applied to linear heat and acoustics equations. and in particular the possibility to take into account curved boundaries. We present an asymptotic analysis that allows an expansion of all the fields in the boundary cells. This analysis founded on pure Taylor expansions confirms the well known behaviour of anti bounce back boundary for the heat equation. The analysis puts also in evidence a hidden differential boundary condition in the case of linear acoustics. Indeed, we observe discrepancies in the acoustic case in the first layers near the border. To reduce these discrepancies, we propose a new boundary condition mixing bounce back for the oblique links and anti bounce back for the normal link. This boundary condition is able to enforce both pressure and tangential velocity on the boundary. Numerical tests with the Poiseuille flow illustrate our theoretical analysis and improve the quality of the flow.
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Dates et versions

hal-01950184 , version 1 (10-12-2018)
hal-01950184 , version 2 (22-06-2020)

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François Dubois, Pierre Lallemand, Mohamed-Mahdi Tekitek. On anti bounce back boundary condition for lattice Boltzmann schemes. 2018. ⟨hal-01950184v1⟩
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