The analysis on the entropy equation shows that the BGK Boltzmann equation meets the entropy condition strictly, implying that the BGK method meets the entropy condition.
This is called the Boltzmann equation.
Lorentz-Boltzmann equation
Thus instead of Boltzmann equation this model equation may be approximately used to discuss the motion of gases in the transient region between molecular flow and viscous...
collisionless Boltzmann equations
Let me now try and introduce the Boltzmann equation because it basically gives us a much deeper appreciation than diffusion theory can in terms of what's going on.
