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Analysis and boundary condition of the lattice Boltzmann BGK model with two velocity components

In this paper, we study the two dimensional lattice Boltzmann BGK model (LBGK) by analytically solving a simple flow in a 2~-D channel. The flow is driven by the movement of upper boundary with vertical injection fluid at the porous boundaries. The velocity profile is shown to satisfy a second-order finite-difference form of the simplified incompressible Navier-Stokes equation. With the analysis, different boundary conditions can be studied theoretically. A momentum exchange principle is also revealed at the boundaries. A general boundary condition for any given velocity boundary is proposed based on the analysis.

preprint1995arXivOpen access
Xiaoyi HeQisu Zou
comp-gasnlin.CG
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Open access2 authors2 topics
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Xiaoyi HeQisu Zou

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