The actual dynamics of fluid flows is highly dependent on the surrounding environment, whose influence is mathematically described through the prescription of suitable boundary conditions. Boundary conditions play a crucial role, as they select solutions which are compatible with external constraints. Accounting for these constraints may be comparatively simple for idealized geometries but for general ones it represents a delicate (and sometimes nerve-probing!) task. In fact, the treatment of the boundary conditions often makes the difference in the quality of fluid dynamic simulations. This chapter illustrates the most common ways to impose boundary conditions to LB flows. The subject is very technical and has grown considerably for the past decade, which means that this chapter can only serve as a guiding introduction to the vast and still growing original literature.
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