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# Bhatnagar-Gross-Krook

The Bhatnagar-Gross-Krook (abbreviated BGK) term refers to a collision operator used in the Lattice Boltzmann method, a CFD teqnique. It is given by the following formula:

$\Omega_i=-\tau^{-1}(n_i-n_i^{EQ})$

where $n_i^{EQ}$ is a local equilibrium value for the population of particles in the direction of link $\mathbf{e}_i$