حبیب اعتمادی

Viscoelastic fluids play significant roles in many industries, including food and polymeric petrochemical and forming industries. The rheological response of viscoelastic fluids is quite complex, including combination of viscous and elastic effects. In this study, mold filling of Oldroyd-B and linear PTT viscoelastic fluids are simulated by the OpenFOAM software. The OpenFOAM is a finite volume based open source software that has been used in Computational Fluid Dynamics (CFD) successfully. The studied mold has a rectangular structure with a gate for fluids injection. The simulation is carrying out at isothermal conditions and flow considered two dimensional. The velocity, shear stress and first normal stress difference changes in different points of the mold are critically studied. The simulation results indicate that maximum velocity decreases along the mold length. Maximum velocity and maximum first normal stress difference increase as injection rate increases. In addition, maximum shear stress and first normal stress difference occur in the inlet of mold and changes of shear stress and first normal stress difference are linear along the mold length. Shear stress changes at the inlet are completely different compared to regions far from the inlet, where the highest values of elongation rate are found.