A new method for the simulation of 2D viscoelastic flow is presented. Numerical stability is obtained by the logarithmic-conformation change of variable, and a fully-implicit pure-streamfunction flow formulation, without use of any artificial diffusion. As opposed to other simulation results, our calculations predict a hydrodynamic instability in the 4:1 contraction geometry at a Weissenberg number of order 4. This new result is in qualitative agreement with the prediction of a non-linear subcritical elastic instability in Poiseuille flow. Our viscoelastic flow solver is coupled with a volume-of-fluid solver in order to predict free-surfaces in extrusion.
|Number of pages||6|
|Publication status||Published - 2013|
|Event||1st International Conference on Rheology and Modeling of Materials (ic-rmm1) - Miskolc-Lillafüred, Hungary|
Duration: 7 Oct 2013 → 11 Oct 2013
Conference number: 1
|Conference||1st International Conference on Rheology and Modeling of Materials (ic-rmm1)|
|Period||07/10/2013 → 11/10/2013|