کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4742305 1641575 2008 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preconditioned iterative methods for Stokes flow problems arising in computational geodynamics
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Preconditioned iterative methods for Stokes flow problems arising in computational geodynamics
چکیده انگلیسی

The numerical solution of a discrete Stokes flow problem is a common component of many computational geodynamic models. We compare using the Schur complement reduction (SCR) and a fully coupled (FC) approach to solve geodynamic problems which are characterized by incompressible fluids containing large variations in viscosity. The scalability and robustness of these methods is assessed by examining their sensitivity to the discretization parameter h   and the viscosity contrast Δη, respectively. We demonstrate that the scaled BFBt preconditioner [Elman, H.C., Howle, V.E., Shadid, J., Shuttleworth, R., Tuminaro, R., 2006. Block preconditioners based on approximate commutators. SIAM J. Sci. Comput. 27 (5), 1651–1668] can be an effective preconditioner for S=GTK−1GS=GTK−1G, even when the fluid viscosity varies in space, provided an appropriate scaling is used. The performance of this preconditioner is strongly linked to the scaling employed. Through a number of numerical experiments, we demonstrate that our new scaling strategy ensures that the scaled BFBt preconditioner remains effective in scenarios where the viscosity variations are either locally smooth or discontinuous. Of the solvers considered, applying FGMRES to the pressure Schur complement in combination with BFBt and our choice of scaling matrices was the most scalable and robust approach.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 171, Issues 1–4, December 2008, Pages 33–47
نویسندگان
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