Method for simulating growth of solidification structure of large ingot under slow cooling condition, and fusion casting experiment apparatus

The invention discloses a method for simulating the growth of the solidification structure of a large ingot under a slow cooling condition, and a fusion casting experiment apparatus. Aiming at a solidification process of the large ingot, the influence on the growth of the solidification structure under different temperature gradients, different cooling speeds and different molten steel flow speeds can be researched through the simulation. An external field is introduced into a metal melt solidification process, so that the influence on the growth of the solidification structure by the external field can be researched. According to the invention, a growth process of the solidification structure of the large ingot under the slow cooling condition is simulated, simulation results are directly related to a large ingot solidification process, and the simulation results play an important role in determining the casting technology for the large ingot, adjusting parameters of related equipment, and improving defects of the solidification structure.