Implicit Control-Volume Method for Injection Molding Simulation of Quadrilateral and Triangular Mixed Mesh

摘要

Implicit control-volume method based on quadrilateral and triangular mixed mesh was proposed for injection molding simulation with Hele-Shaw approximation. Since control-volume method will generate asymmetric matrix for quadrilateral mesh, the asymmetric parts of matrix were moved to the right-hand side of equations to transform the equations into the symmetric equations, and then pre-conditioned conjugate gradient (PCG) method was applied. To solve the pressures, the right-hand sides were updated only when the solved region had changed. The time steps of injection molding simulation were adjusted in order to fill about one element-size layer within two time steps; the gap-direction was discretized by the Chebyshev collocation method. To reduce the computing efforts, the flow front was checked for each ten PCG iterations to determine the filled domain. The comparison with the well-documented results showed that the control-volume method based on the mixed mesh was accurate and effective for injection molding simulation.