期刊
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
卷 28, 期 3, 页码 1987-2019出版社
SPRINGER
DOI: 10.1007/s11831-020-09526-x
关键词
-
类别
资金
- Chilean Council for Scientific and Technological Research [CONICYT- FONDECYT 11160160]
- Spanish Government through a predoctoral FPI Grant
- Spanish Government through the Ramon y Cajal Grant [RYC-2015-17367]
- ICREA Academia Research Program, from the Catalan government
This article summarises the work of our group in the area of stabilised finite element formulations for viscoelastic fluid flows. The discussion includes stabilised methods, treatment of constitutive equations, numerical difficulties associated with the incompressible Navier-Stokes equations, and techniques to prevent local oscillations.
The objective of this article is to summarise the work that we have been doing as a group in the context of stabilised finite element formulations for viscoelastic fluid flows. Viscoelastic fluids are complex non-Newtonian fluids, characterised by having an irreducible constitutive equation that needs to be solved coupled with the momentum and continuity equations. The finite element approximation of this kind of fluids presents several numerical difficulties. It inherits obviously the problems associated with the approximation of the incompressible Navier-Stokes equations. But, on top of that, now the constitutive equation is highly non-linear, with an advective term that may lead to both global and local oscillations in the numerical approximation. Moreover, even in the case of smooth solutions, it is necessary to meet some additional compatibility conditions between the velocity and the stress interpolation in order to ensure control over velocity gradients. The stabilised methods detailed in this work allow one to use equal order or even arbitrary interpolation for the problem unknowns (sigma-u-p) (elastic deviatoric stress-velocity-pressure) and to stabilise dominant convective terms, and all of them can be framed in the context of variational multi-scale methods. Some additional numerical ingredients that are introduced in this article are the treatment of the non-linearities associated with the problem and the possibility to introduce a discontinuity-capturing technique to prevent local oscillations. Concerning the constitutive equation, both the standard as the logarithmic conformation reformulation are discussed for stationary and time-dependent problems, and different versions of stabilised finite element formulations are presented in both cases.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据