Modified Algorithm for Simulation of Injection Molding Process

In order to improve the accuracy of numerical simulation for injection molding process, a notion similar to upwind method was introduced. As the governing equation of the filling state takes the form of an advection equation, distorted simulation result may be induced by the flow of air in the mold cavity. To solve the problem, a numerical correction method was proposed. This method weakens the adverse effect of air flow velocity field on the filling process, by modifying the fluid velocity field through systematic operations based on an efficient explicit algorithm and finite element software. Thus, the advection of filling state mainly depends on the flow field behind the filling front. In addition, a numerical simulation was made in mold cavities of shapes ⊥ and L to verify the effectiveness of the method. The result shows that the proposed method can suppress the distortion phenomenon of filling flow effectively, and ensure a correct filling process in complex channels, in which the flow directions have large-angel changes.