2018/09/30 by Anupam Gupta, Dario Vincenzi · 1 citation
Physics and Astronomy · #physics.flu-dyn #nlin.CD
paper · pdf · doi:10.1017/jfm.2019.224
published as J. Fluid Mech. (2019) · 17 pages
arxiv created 2019/03/07 · arxiv updated 2019/05/22
Elastic turbulence is a chaotic regime that emerges in polymer solutions at low Reynolds numbers. A common way to ensure stability in numerical simulations of polymer solutions is to add artificially large polymer-stress diffusion. In order to assess the accuracy of this approach in the elastic-turbulence regime, we compare numerical simulations of the two-dimensional Oldroyd-B and FENE-P models sustained by a cellular force with and without artificial diffusion. We find that artificial diffusion can have a dramatic effect even on the large-scale properties of the flow and we show some of the spurious phenomena that may arise when artificial diffusion is used.