Abstract
In order to improve the accuracy of numerical prediction on non-newtonian fluid motion in relation to injection molding, a new scheme is presented here. To describe the interface of two phase, i.e., air and resin, Cahn-Hilliard equation is introduced, and to represent the complex flow passage, IB (immersed boundary) method is applied for both momentum and Cahn-Hilliard equations, respectively. Further since the discontinuity of fluid properties between two phase induces the numerical instability, various type of numerical scheme for the convection terms of governing equations are examined. As result of applying the procedure to a contraction-expansion flow passage, it reveals that the proposed method is able to capture the details of the flow behavior between the air and the resin.
