Note that a practical upper limit for the thermal gradient, G, is about 10 K/mm.

By substitution of appropriate values into this equation, or by running the simulation, it will soon become apparent that, unless C₀ is extremely low (highly pure material), this velocity is very low - i.e. constitutional undercooling is very difficult to avoid.

Explore the simulation parameters to see under which condition the constitutional undercooling may occur.