کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
670843 1459063 2011 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A Newton–Krylov finite volume algorithm for the power-law non-Newtonian fluid flow using pseudo-compressibility technique
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
A Newton–Krylov finite volume algorithm for the power-law non-Newtonian fluid flow using pseudo-compressibility technique
چکیده انگلیسی

An implicit Newton–Krylov finite volume algorithm has been developed for efficient steady-state computation of the power-law non-Newtonian fluid flows. The pseudo-compressibility technique is used for the coupling of continuity and momentum equations. The spatial discretization is central (second-order) for both convective and diffusive terms and the accuracy of the solution is verified. The nine block diagonal Jacobian matrix (needed for implicit formulation) is computed directly through the flux differentiation. Five-diagonal and three-diagonal block matrices (the simplified versions of the main Jacobian matrix) are used with the ILU(0 & 1) and the Thomas linear solvers for preconditioning, respectively. The performance of the Newton-GMRES solver is examined in detail for different preconditioning strategies. The effects of the power-law behavior index and Re number on the convergence rate are also studied. The performance of the Newton-BiCGSTAB and the Newton-GMRES solvers are compared with each other. The results show, the ILU(1)/Newton-GMRES is the most efficient combination that is robust even in high Reynolds number shear-thinning fluid flow cases.


► A Newton–Krylov finite volume algorithm has been developed for the power-law fluid flows.
► Pseudo-compressibility is used for the coupling of the incompressible equations.
► The performance of the Newton-GMRES and BICGSTAB solvers are examined in detail.
► The effects of the power-law index and Re on the convergence rate are also studied.
► The ILU(1)/Newton-GMRES is the robust solver even in high Re shear-thinning flow.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 166, Issues 19–20, October 2011, Pages 1158–1172
نویسندگان
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