On pressure and velocity flow boundary conditions for the lattice Boltzmann BGK model

Details On pressure and velocity flow boundary conditions for the lattice Boltzmann BGK model On pressure and velocity flow boundary conditions for the lattice Boltzmann BGK model

1995-08-08

arxiv.org/abs/comp-gas/9508001v1

Nonlinear Sciences

Cellular Automata and Lattice Gases

16 pages, four figures are submitted using `figure'

Scientific paper

Pressure (density) and velocity boundary conditions inside a flow domain are studied for 2-D and 3-D lattice Boltzmann BGK models (LBGK) and new method to specify these conditions are proposed. These conditions are consistent with the boundary condition we proposed in a previous paper using an idea of bounce-back of non-equilibrium distribution. These conditions give excellent results for the regular LBGK models, and were shown to be second-order accurate by numerical examples. When they are used together with the improved incompressible LBGK model proposed by zou et al. the simulation results recover the analytical solution of the plane Poiseuille flow driven by pressure (density) difference with machine accuracy.

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