TY - JOUR
T1 - On Preconditioning of Incompressible Non-Newtonian Flow Problems
AU - He , Xin
AU - Neytcheva , Maya
AU - Vuik , Cornelis
JO - Journal of Computational Mathematics
VL - 1
SP - 33
EP - 58
PY - 2015
DA - 2015/02
SN - 33
DO - http://doi.org/10.4208/jcm.1407-m4486
UR - https://global-sci.org/intro/article_detail/jcm/9826.html
KW - non-Newtonian flows, Navier-Stokes equations, Two-by-two block systems,
Krylov subspace methods, Preconditioners.
AB - <p style="text-align: justify;">This paper deals with fast and reliable numerical solution methods for the incompressible non-Newtonian Navier-Stokes equations. To handle the nonlinearity of the governing equations, the Picard and Newton methods are used to linearize these coupled partial differential equations. For space discretization we use the finite element method and utilize the two-by-two block structure of the matrices in the arising algebraic systems of equations. The Krylov subspace iterative methods are chosen to solve the linearized discrete systems and the development of computationally and numerically efficient preconditioners for the two-by-two block matrices is the main concern in this paper. In non-Newtonian flows, the viscosity is not constant and its variation is an important factor that affects the performance of some already known preconditioning techniques. In this paper we examine the performance of several preconditioners for variable viscosity applications, and improve them further to be robust with respect to variations in viscosity.</p>