Melt simulation regulation and control method for multilayer distributor

The invention discloses a multilayer distributor melt retention simulation regulation and control method, which comprises the following steps: establishing a distributor runner geometric model, carrying out grid division on the geometric model, importing divided grids into numerical software, applying boundary conditions in simulation software, setting physical property parameters, and carrying out numerical iterative calculation. After calculation is completed, flow field distribution of a distributor confluence area is checked, flow field information is judged, if the melt confluence low-speed area is located above the main flow direction or the area of the melt low-speed area is large, retention is likely to occur, if the melt confluence low-speed area is located below the main flow direction and the area of the low-speed area is small, retention is not likely to occur, and if it is judged that retention occurs, the flow field information is judged to be inconsistent; if the flow state is not reasonable, t