A new numerical framework to simulate viscoelastic free-surface flows with the finite-volume method

1st International Conference on Rheology and Modeling of Materials

物理学;材料科学

Comminal, R.^1 ; Spangenberg, J.^1,2 ; Hattel, J.H.^1

Department of Mechanical Engineering, Technical University of Denmark, Lyngby

2800 Kgs., Denmark^1

Civil and Environmental Engineering, Princeton University, Princeton

NJ

08544, United States^2

关键词: Artificial diffusion;    Conformation change;    Elastic instabilities;    Free-surface flow;    Hydrodynamic instabilities;    Viscoelastic flows;    Volume of fluids;    Weissenberg number;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/602/1/012022/pdf
DOI  :  10.1088/1742-6596/602/1/012022

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.