The Courant–Friedrichs–Lewy (CFL) condition is a necessary stability criterion for numerical solutions of hyperbolic diferencial parcial equations using explicit time-integration schemes. It dictates that the time step size must be small enough that information does not travel further than one spatial grid cell per time step. For a 1D case, [látex]C = u \frac{\Delta t}{\Delta x} \le C_{max}[/latex], ensuring numerical stability.
