Bhatnagar–Gross–Krook operator

The Bhatnagar–Gross–Krook (BGK) operator is a mathematical operator used in kinetic theory and computational fluid dynamics, particularly in the context of lattice Boltzmann methods. It provides a simplified model for the Boltzmann equation, which describes the behavior of a gas at a microscopic level. The BGK operator modifies the collision term in the Boltzmann equation to facilitate the analysis and numerical simulation of fluid flows.