In this paper, the boundary conditions of 2D and 3D Cellular Automaton models (CA models) are considered and classified. It is shown that the simulation algorithm does not change at different boundary conditions, and the computing complexity of simulation is not increased with a large number of wall cells, even when simulating a porous medium. The numerical experiments are described, which were carried out with the CA models of fluid flows in a tube and in a porous medium. The parabolic dependence of a flow speed on a distance to the wall is attained for a flow in a pipe, which coincides with analytical results.

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