Abstract:

In order to simulate the mold filling process of non-Newtonian fluid and calculate the velocity of free surface without Ghost method, a three dimensional mathematical model for incompressible gas-liquid two-phase flow coupled with Navier-Stokes equations is established.The governing equations are solved by the finite volume method on a non-staggered grid and the interpolation technique on the collocated grid is used for solving pressure-velocity decoupling problem.The melt interface evolution versus time is captured by the Level Set method and the physical quantities of the flow field, such as velocity, pressure, shear rate and temperature at each time step, are obtained with corresponding analysis.The effect of injection parameters, such as injection rate and inlet temperature, on the filling process and thickness of solidified layer are studied.The simulation result is in good agreement with the experimental data.Numerical results show that the three dimensional mathematical model for the gas-liquid two-phase flow can describe the filling process of polymer melt more precisely, and larger injection rate and higher inlet temperature lead to thinner solidified layer.