In the paper,the fluid flow in a two-dimentional cavity is simulated by usi
ng 13-speed lattice Bahtnagar-Gross-Krook method on the hexagonal lattice.
The evolution of driven flow is shown for different Reynold numbers. The de
tailed behaviors are simulated and the vortex formation, distribution of de
nsity pressure and temperature are shown at Reynold number 3000.