The Courant–Friedrichs–Lewy or CFL condition is a condition for the stability of unstable numerical methods that model convection or wave phenomena.

Implicit is unconditionally stable, and also lacks a CFL condition.

For more details, please refer to fluent theory guide: 24.5.4. Steady-State Flow Solution Methods (

If you are not able to access the link, please refer to this forum discussion:

Thank you