NUMERICAL SIMULATION METHOD FOR VISCOELASTIC FLOWS WITH FREE SURFACES - FRINGE ELEMENT GENERATION METHOD
TORU SATO* AND STEPHEN M. RICHARDSON
Department of Chemical Engineering and Chemical Technology,
Imperial College, London SW7 2BY, U.K.
To simulate filling flow in injection moulding for viscoelastic fluids, a numerical method, based on a finite element method and a finite volume method, has been developed for incompressible isothermal viscoelastic flow with moving free surfaces. The advantages of this method are, first, good applicability to arbitrarily-shaped mould geometries and, second, accurate treatment for boundary conditions on the free surface. Typical filling flows are simulated, namely: filling flow into a 1:4 expansion cavity with and without an obstacle. Numerical results predict the position of weld lines and air-traps. The method also indicates the effects of elongational flow on molecular orientation.
KEY WORDS: Finite element/finite volume method, Free surface, Viscoelastic flow, Injection moulding