Preconditioning mixed finite elements for tide models
Preconditioning mixed finite elements for tide models
复制标题
潮汐模型的预处理混合有限元
DOI:
10.1016/j.camwa.2020.11.002
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发表时间:
2021
影响因子:
2.9
通讯作者:
Kernell, Tate
中科院分区:
文献类型:
--
作者:
Kirby, Robert C.;Kernell, Tate
We describe a fully discrete mixed finite element method for the linearized rotating shallow water model, possibly with damping. While Crank–Nicolson time-stepping conserves energy in the absence of drag or forcing terms and is not subject to a CFL-like stability condition, it requires the inversion of a linear system at each step. We develop weighted-norm preconditioners for this algebraic system that are nearly robust with respect to the physical and discretization parameters in the system. Numerical experiments using Firedrake support the theoretical results.
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