Abstract
We propose a numerical scheme for simulation of transient flows of incompressible non-Newtonian fluids characterised by a non-monotone relation between the symmetric part of the velocity gradient (shear rate) and the Cauchy stress tensor (shear stress). The main difficulty in dealing with the governing equations for flows of such fluids is that the non-monotone constitutive relation allows several values of the stress to be associated with the same value of the symmetric part of the velocity gradient. This issue is handled via a reformulation of the governing equations. The equations are reformulated as a system for the triple pressure–velocity–apparent viscosity, where the apparent viscosity is given by a scalar implicit equation. We prove that the proposed numerical scheme has—on the discrete level—a solution, and using the proposed scheme, we numerically solve several flow problems.
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This research was supported by ERC-CZ Project LL1202 funded by Ministry of Education, Youth and Sports of the Czech Republic. Josef Málek and Vít Průša acknowledge the support of the Czech Science Foundation Project 18-12719S. Adam Janečka acknowledges the support of Project 260449/2018 “Student research in the field of physics didactics and mathematical and computer modelling”.
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Janečka, A., Málek, J., Průša, V. et al. Numerical scheme for simulation of transient flows of non-Newtonian fluids characterised by a non-monotone relation between the symmetric part of the velocity gradient and the Cauchy stress tensor. Acta Mech 230, 729–747 (2019). https://doi.org/10.1007/s00707-019-2372-y
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DOI: https://doi.org/10.1007/s00707-019-2372-y