Oversized grid coupling numerical heat transfer calculation memory processing method

The invention provides an oversized grid coupling numerical heat transfer calculation memory processing method, which comprises the following steps of: establishing an external database which comprises a thermal environment distribution boundary condition; thermal environment distribution boundary conditions are read into a program according to a time sequence and stored into a one-dimensional array variable, and a discrete time point and heat flow relation of Q = f (t) is established; time steps are determined according to calculation starting and ending time and time step length, the heating surface thermal environment under any time step is obtained through interpolation according to the time steps and Q = f (t), and the thermal environment of each time step is output to an external data file and stored in a computer hard disk; before formal heat transfer starts, destroying all thermal environment boundary condition variables related to an external database in a program; formally starting heat transfer cal